7c1fe95333
Version 3.5 brings: - Atomic commits of ruleset changes (reduce the chance of ending up in an inconsistent state). - A 30% reduction in the size of state table entries. - Source-tracking (limit number of clients and states per client). - Sticky-address (the flexibility of round-robin with the benefits of source-hash). - Significant improvements to interface handling. - and many more ...
128 lines
4.0 KiB
C
128 lines
4.0 KiB
C
/* $FreeBSD$ */
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/* from $OpenBSD: kern_subr.c,v 1.26 2003/10/31 11:10:41 markus Exp $ */
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/* $NetBSD: kern_subr.c,v 1.15 1996/04/09 17:21:56 ragge Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/queue.h>
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#include <sys/kernel.h>
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#include <sys/resourcevar.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <net/pfvar.h>
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/*
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* This implements additional functions used by pf which can not be ported
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* easyly. At this point it boils down to mostly the Net/OpenBSD hook
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* implementation.
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*
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* BEWARE: this is not locked! Required locking is done by the caller.
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*/
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void *
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hook_establish(struct hook_desc_head *head, int tail, void (*fn)(void *),
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void *arg)
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{
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struct hook_desc *hdp;
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hdp = (struct hook_desc *)malloc(sizeof (*hdp), M_DEVBUF, M_NOWAIT);
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if (hdp == NULL)
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return (NULL);
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hdp->hd_fn = fn;
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hdp->hd_arg = arg;
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if (tail)
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TAILQ_INSERT_TAIL(head, hdp, hd_list);
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else
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TAILQ_INSERT_HEAD(head, hdp, hd_list);
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return (hdp);
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}
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void
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hook_disestablish(struct hook_desc_head *head, void *vhook)
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{
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struct hook_desc *hdp;
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#ifdef DIAGNOSTIC
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for (hdp = TAILQ_FIRST(head); hdp != NULL;
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hdp = TAILQ_NEXT(hdp, hd_list))
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if (hdp == vhook)
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break;
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if (hdp == NULL)
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panic("hook_disestablish: hook not established");
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#endif
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hdp = vhook;
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TAILQ_REMOVE(head, hdp, hd_list);
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free(hdp, M_DEVBUF);
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}
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/*
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* Run hooks. Startup hooks are invoked right after scheduler_start but
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* before root is mounted. Shutdown hooks are invoked immediately before the
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* system is halted or rebooted, i.e. after file systems unmounted,
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* after crash dump done, etc.
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*/
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void
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dohooks(struct hook_desc_head *head, int flags)
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{
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struct hook_desc *hdp;
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if ((flags & HOOK_REMOVE) == 0) {
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TAILQ_FOREACH(hdp, head, hd_list) {
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(*hdp->hd_fn)(hdp->hd_arg);
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}
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} else {
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while ((hdp = TAILQ_FIRST(head)) != NULL) {
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TAILQ_REMOVE(head, hdp, hd_list);
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(*hdp->hd_fn)(hdp->hd_arg);
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if ((flags & HOOK_FREE) != 0)
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free(hdp, M_DEVBUF);
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}
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}
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}
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