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/* $FreeBSD$ */
/* from $OpenBSD: kern_subr.c,v 1.26 2003/10/31 11:10:41 markus Exp $ */
/* $NetBSD: kern_subr.c,v 1.15 1996/04/09 17:21:56 ragge Exp $ */
/*
* Copyright (c) 1982, 1986, 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/kernel.h>
#include <sys/resourcevar.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <net/pfvar.h>
/*
* This implements additional functions used by pf which can not be ported
* easyly. At this point it boils down to mostly the Net/OpenBSD hook
* implementation.
*
* BEWARE: this is not locked! Required locking is done by the caller.
*/
void *
hook_establish(struct hook_desc_head *head, int tail, void (*fn)(void *),
void *arg)
{
struct hook_desc *hdp;
hdp = (struct hook_desc *)malloc(sizeof (*hdp), M_DEVBUF, M_NOWAIT);
if (hdp == NULL)
return (NULL);
hdp->hd_fn = fn;
hdp->hd_arg = arg;
if (tail)
TAILQ_INSERT_TAIL(head, hdp, hd_list);
else
TAILQ_INSERT_HEAD(head, hdp, hd_list);
return (hdp);
}
void
hook_disestablish(struct hook_desc_head *head, void *vhook)
{
struct hook_desc *hdp;
#ifdef DIAGNOSTIC
for (hdp = TAILQ_FIRST(head); hdp != NULL;
hdp = TAILQ_NEXT(hdp, hd_list))
if (hdp == vhook)
break;
if (hdp == NULL)
panic("hook_disestablish: hook not established");
#endif
hdp = vhook;
TAILQ_REMOVE(head, hdp, hd_list);
free(hdp, M_DEVBUF);
}
/*
* Run hooks. Startup hooks are invoked right after scheduler_start but
* before root is mounted. Shutdown hooks are invoked immediately before the
* system is halted or rebooted, i.e. after file systems unmounted,
* after crash dump done, etc.
*/
void
dohooks(struct hook_desc_head *head, int flags)
{
struct hook_desc *hdp;
if ((flags & HOOK_REMOVE) == 0) {
TAILQ_FOREACH(hdp, head, hd_list) {
(*hdp->hd_fn)(hdp->hd_arg);
}
} else {
while ((hdp = TAILQ_FIRST(head)) != NULL) {
TAILQ_REMOVE(head, hdp, hd_list);
(*hdp->hd_fn)(hdp->hd_arg);
if ((flags & HOOK_FREE) != 0)
free(hdp, M_DEVBUF);
}
}
}
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