diff options
Diffstat (limited to 'sys/contrib/pf/net/pf_subr.c')
| -rw-r--r-- | sys/contrib/pf/net/pf_subr.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/sys/contrib/pf/net/pf_subr.c b/sys/contrib/pf/net/pf_subr.c new file mode 100644 index 0000000..3de2924 --- /dev/null +++ b/sys/contrib/pf/net/pf_subr.c @@ -0,0 +1,127 @@ +/* $FreeBSD$ */ +/* 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); + } + } +} |
