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//==========================================================================

//

//      src/sys/kern/uipc_accf.c

//

//==========================================================================

//####BSDCOPYRIGHTBEGIN####

//

// -------------------------------------------

//

// Portions of this software may have been derived from OpenBSD, 

// FreeBSD or other sources, and are covered by the appropriate

// copyright disclaimers included herein.

//

// Portions created by Red Hat are

// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.

//

// -------------------------------------------

//

//####BSDCOPYRIGHTEND####

//==========================================================================

/*

 * Copyright (c) 2000 Paycounter, Inc.

 * Author: Alfred Perlstein <alfred@paycounter.com>, <alfred@FreeBSD.org>

 * All rights reserved.

 *

 * 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.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.

 *

 *      $FreeBSD: src/sys/kern/uipc_accf.c,v 1.2.2.2 2000/09/20 21:19:21 ps Exp $

 */

#include <sys/param.h>

#include <sys/domain.h>

#include <sys/malloc.h>

#include <sys/mbuf.h>

#include <sys/protosw.h>

#include <sys/socket.h>

#include <sys/socketvar.h>

#include <sys/queue.h>

static SLIST_HEAD(, accept_filter) accept_filtlsthd =

        SLIST_HEAD_INITIALIZER(&accept_filtlsthd);

static int unloadable = 0;

/*

 * must be passed a malloc'd structure so we don't explode if the kld

 * is unloaded, we leak the struct on deallocation to deal with this,

 * but if a filter is loaded with the same name as a leaked one we re-use

 * the entry.

 */

int

accept_filt_add(struct accept_filter *filt)

{

        struct accept_filter *p;

        SLIST_FOREACH(p, &accept_filtlsthd, accf_next)

                if (strcmp(p->accf_name, filt->accf_name) == 0)  {

                        if (p->accf_callback != NULL) {

                                return (EEXIST);

                        } else {

                                p->accf_callback = filt->accf_callback;

                                FREE(filt, M_ACCF);

                                return (0);

                        }

                }

        if (p == NULL)

                SLIST_INSERT_HEAD(&accept_filtlsthd, filt, accf_next);

        return (0);

}

int

accept_filt_del(char *name)

{

        struct accept_filter *p;

        p = accept_filt_get(name);

        if (p == NULL)

                return (ENOENT);

        p->accf_callback = NULL;

        return (0);

}

struct accept_filter *

accept_filt_get(char *name)

{

        struct accept_filter *p;

        SLIST_FOREACH(p, &accept_filtlsthd, accf_next)

                if (strcmp(p->accf_name, name) == 0)

                        return (p);

        return (NULL);

}

#ifdef ACCEPT_FILTER_MOD

int

accept_filt_generic_mod_event(module_t mod, int event, void *data)

{

        struct accept_filter *p;

        struct accept_filter *accfp = (struct accept_filter *) data;

        int     s, error;

        switch (event) {

        case MOD_LOAD:

                MALLOC(p, struct accept_filter *, sizeof(*p), M_ACCF, M_WAITOK);

                bcopy(accfp, p, sizeof(*p));

                s = splnet();

                error = accept_filt_add(p);

                splx(s);

                break;

        case MOD_UNLOAD:

                /*

                 * Do not support unloading yet. we don't keep track of refcounts

                 * and unloading an accept filter callback and then having it called

                 * is a bad thing.  A simple fix would be to track the refcount

                 * in the struct accept_filter.

                 */

                if (unloadable != 0) {

                        s = splnet();

                        error = accept_filt_del(accfp->accf_name);

                        splx(s);

                } else

                        error = EOPNOTSUPP;

                break;

        case MOD_SHUTDOWN:

                error = 0;

                break;

        default:

                error = EOPNOTSUPP;

                break;

        }

        return (error);

}

#endif