127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#include <sys/zfs_context.h>
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#include <sys/crypto/common.h>
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#include <sys/crypto/api.h>
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#include <sys/crypto/impl.h>
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#include <sys/crypto/sched_impl.h>
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/*
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* All event subscribers are put on a list. kcf_notify_list_lock
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* protects changes to this list.
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*
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* The following locking order is maintained in the code - The
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* global kcf_notify_list_lock followed by the individual lock
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* in a kcf_ntfy_elem structure (kn_lock).
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*/
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kmutex_t ntfy_list_lock;
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kcondvar_t ntfy_list_cv; /* cv the service thread waits on */
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static kcf_ntfy_elem_t *ntfy_list_head;
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/*
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* crypto_mech2id()
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*
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* Arguments:
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* . mechname: A null-terminated string identifying the mechanism name.
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*
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* Description:
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* Walks the mechanisms tables, looking for an entry that matches the
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* mechname. Once it find it, it builds the 64-bit mech_type and returns
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* it. If there are no hardware or software providers for the mechanism,
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* but there is an unloaded software provider, this routine will attempt
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* to load it.
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*
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* Context:
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* Process and interruption.
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*
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* Returns:
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* The unique mechanism identified by 'mechname', if found.
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* CRYPTO_MECH_INVALID otherwise.
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*/
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crypto_mech_type_t
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crypto_mech2id(char *mechname)
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{
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return (crypto_mech2id_common(mechname, B_TRUE));
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}
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/*
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* We walk the notification list and do the callbacks.
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*/
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void
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kcf_walk_ntfylist(uint32_t event, void *event_arg)
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{
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kcf_ntfy_elem_t *nep;
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int nelem = 0;
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mutex_enter(&ntfy_list_lock);
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/*
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* Count how many clients are on the notification list. We need
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* this count to ensure that clients which joined the list after we
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* have started this walk, are not wrongly notified.
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*/
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for (nep = ntfy_list_head; nep != NULL; nep = nep->kn_next)
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nelem++;
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for (nep = ntfy_list_head; (nep != NULL && nelem); nep = nep->kn_next) {
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nelem--;
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/*
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* Check if this client is interested in the
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* event.
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*/
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if (!(nep->kn_event_mask & event))
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continue;
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mutex_enter(&nep->kn_lock);
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nep->kn_state = NTFY_RUNNING;
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mutex_exit(&nep->kn_lock);
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mutex_exit(&ntfy_list_lock);
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/*
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* We invoke the callback routine with no locks held. Another
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* client could have joined the list meanwhile. This is fine
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* as we maintain nelem as stated above. The NULL check in the
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* for loop guards against shrinkage. Also, any callers of
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* crypto_unnotify_events() at this point cv_wait till kn_state
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* changes to NTFY_WAITING. Hence, nep is assured to be valid.
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*/
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(*nep->kn_func)(event, event_arg);
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mutex_enter(&nep->kn_lock);
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nep->kn_state = NTFY_WAITING;
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cv_broadcast(&nep->kn_cv);
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mutex_exit(&nep->kn_lock);
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mutex_enter(&ntfy_list_lock);
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}
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mutex_exit(&ntfy_list_lock);
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}
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#if defined(_KERNEL)
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EXPORT_SYMBOL(crypto_mech2id);
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#endif
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