xnu-3789.70.16.tar.gz

[apple/xnu.git] / bsd / kern / uipc_domain.c

/*
 * Copyright (c) 1998-2013 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * Copyright (c) 1982, 1986, 1993
 *      The Regents of the University of California.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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.
 *
 *      @(#)uipc_domain.c       8.3 (Berkeley) 2/14/95
 */

#include <sys/param.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/domain.h>
#include <sys/mcache.h>
#include <sys/mbuf.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/proc_internal.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/queue.h>

#include <net/dlil.h>

#include <mach/boolean.h>
#include <pexpert/pexpert.h>

static void pr_init_old(struct protosw *, struct domain *);
static void init_proto(struct protosw *, struct domain *);
static void attach_proto(struct protosw *, struct domain *);
static void detach_proto(struct protosw *, struct domain *);
static void dom_init_old(struct domain *);
static void init_domain(struct domain *);
static void attach_domain(struct domain *);
static void detach_domain(struct domain *);
static struct protosw *pffindprotonotype_locked(int, int, int);
static struct domain *pffinddomain_locked(int);

static boolean_t domain_timeout_run;    /* domain timer is scheduled to run */
static boolean_t domain_draining;
static void domain_sched_timeout(void);
static void domain_timeout(void *);

lck_grp_t       *domain_proto_mtx_grp;
lck_attr_t      *domain_proto_mtx_attr;
static lck_grp_attr_t   *domain_proto_mtx_grp_attr;
decl_lck_mtx_data(static, domain_proto_mtx);
decl_lck_mtx_data(static, domain_timeout_mtx);

static u_int64_t _net_uptime;

#if (DEVELOPMENT || DEBUG)

SYSCTL_DECL(_kern_ipc);

static int sysctl_do_drain_domains SYSCTL_HANDLER_ARGS;

SYSCTL_PROC(_kern_ipc, OID_AUTO, do_drain_domains,
        CTLTYPE_INT|CTLFLAG_RW|CTLFLAG_LOCKED,
        0, 0,
        sysctl_do_drain_domains, "I", "force manual drain domains");

#endif /* DEVELOPMENT || DEBUG */

static void
pr_init_old(struct protosw *pp, struct domain *dp)
{
#pragma unused(dp)
        VERIFY(pp->pr_flags & PR_OLD);
        VERIFY(pp->pr_old != NULL);

        if (pp->pr_old->pr_init != NULL)
                pp->pr_old->pr_init();
}

static void
init_proto(struct protosw *pp, struct domain *dp)
{
        VERIFY(pp->pr_flags & PR_ATTACHED);

        if (!(pp->pr_flags & PR_INITIALIZED)) {
                TAILQ_INIT(&pp->pr_filter_head);
                if (pp->pr_init != NULL)
                        pp->pr_init(pp, dp);
                pp->pr_flags |= PR_INITIALIZED;
        }
}

static void
attach_proto(struct protosw *pp, struct domain *dp)
{
        domain_proto_mtx_lock_assert_held();
        VERIFY(!(pp->pr_flags & PR_ATTACHED));
        VERIFY(pp->pr_domain == NULL);
        VERIFY(pp->pr_protosw == NULL);

        TAILQ_INSERT_TAIL(&dp->dom_protosw, pp, pr_entry);
        pp->pr_flags |= PR_ATTACHED;
        pp->pr_domain = dp;
        pp->pr_protosw = pp;

        /* do some cleaning up on user request callbacks */
        pru_sanitize(pp->pr_usrreqs);
}

static void
detach_proto(struct protosw *pp, struct domain *dp)
{
        domain_proto_mtx_lock_assert_held();
        VERIFY(pp->pr_flags & PR_ATTACHED);
        VERIFY(pp->pr_domain == dp);
        VERIFY(pp->pr_protosw == pp);

        TAILQ_REMOVE(&dp->dom_protosw, pp, pr_entry);
        pp->pr_flags &= ~PR_ATTACHED;
        pp->pr_domain = NULL;
        pp->pr_protosw = NULL;
}

static void
dom_init_old(struct domain *dp)
{
        VERIFY(dp->dom_flags & DOM_OLD);
        VERIFY(dp->dom_old != NULL);

        if (dp->dom_old->dom_init != NULL)
                dp->dom_old->dom_init();
}

static void
init_domain(struct domain *dp)
{
        VERIFY(dp->dom_flags & DOM_ATTACHED);

        if (!(dp->dom_flags & DOM_INITIALIZED)) {
                lck_mtx_init(&dp->dom_mtx_s, domain_proto_mtx_grp,
                    domain_proto_mtx_attr);
                dp->dom_mtx = &dp->dom_mtx_s;
                TAILQ_INIT(&dp->dom_protosw);
                if (dp->dom_init != NULL)
                        dp->dom_init(dp);
                dp->dom_flags |= DOM_INITIALIZED;
        }

        /* Recompute for new protocol */
        if (_max_linkhdr < 16)          /* XXX - Sheesh; everything's ether? */
                _max_linkhdr = 16;
        _max_linkhdr = max_linkhdr;     /* round it up */

        if (dp->dom_protohdrlen > _max_protohdr)
                _max_protohdr = dp->dom_protohdrlen;
        _max_protohdr = max_protohdr;   /* round it up */

        max_hdr = max_linkhdr + max_protohdr;
        max_datalen = MHLEN - max_hdr;
}

static void
attach_domain(struct domain *dp)
{
        domain_proto_mtx_lock_assert_held();
        VERIFY(!(dp->dom_flags & DOM_ATTACHED));

        TAILQ_INSERT_TAIL(&domains, dp, dom_entry);
        dp->dom_flags |= DOM_ATTACHED;
}

static void
detach_domain(struct domain *dp)
{
        domain_proto_mtx_lock_assert_held();
        VERIFY(dp->dom_flags & DOM_ATTACHED);

        TAILQ_REMOVE(&domains, dp, dom_entry);
        dp->dom_flags &= ~DOM_ATTACHED;

        if (dp->dom_flags & DOM_OLD) {
                struct domain_old *odp = dp->dom_old;

                VERIFY(odp != NULL);
                odp->dom_next = NULL;
                odp->dom_mtx = NULL;
        }
}

/*
 * Exported (private) routine, indirection of net_add_domain.
 */
void
net_add_domain_old(struct domain_old *odp)
{
        struct domain *dp;
        domain_guard_t guard;

        VERIFY(odp != NULL);

        guard = domain_guard_deploy();
        if ((dp = pffinddomain_locked(odp->dom_family)) != NULL) {
                /*
                 * There is really nothing better than to panic here,
                 * as the caller would not have been able to handle
                 * any failures otherwise.
                 */
                panic("%s: domain (%d,%s) already exists for %s\n", __func__,
                    dp->dom_family, dp->dom_name, odp->dom_name);
                /* NOTREACHED */
        }

        /* Make sure nothing is currently pointing to the odp. */
        TAILQ_FOREACH(dp, &domains, dom_entry) {
                if (dp->dom_old == odp) {
                        panic("%s: domain %p (%d,%s) is already "
                            "associated with %p (%d,%s)\n", __func__,
                            odp, odp->dom_family, odp->dom_name, dp,
                            dp->dom_family, dp->dom_name);
                        /* NOTREACHED */
                }
        }

        if (odp->dom_protosw != NULL) {
                panic("%s: domain (%d,%s) protocols need to added "
                    "via net_add_proto\n", __func__, odp->dom_family,
                    odp->dom_name);
                /* NOTREACHED */
        }

        dp = _MALLOC(sizeof (*dp), M_TEMP, M_WAITOK | M_ZERO);
        if (dp == NULL) {
                /*
                 * There is really nothing better than to panic here,
                 * as the caller would not have been able to handle
                 * any failures otherwise.
                 */
                panic("%s: unable to allocate memory for domain family "
                    "%d (%s)\n", __func__, odp->dom_family, odp->dom_name);
                /* NOTREACHED */
        }

        /* Copy everything but dom_init, dom_mtx, dom_next and dom_refs */
        dp->dom_family          = odp->dom_family;
        dp->dom_flags           = (odp->dom_flags & DOMF_USERFLAGS) | DOM_OLD;
        dp->dom_name            = odp->dom_name;
        dp->dom_init            = dom_init_old;
        dp->dom_externalize     = odp->dom_externalize;
        dp->dom_dispose         = odp->dom_dispose;
        dp->dom_rtattach        = odp->dom_rtattach;
        dp->dom_rtoffset        = odp->dom_rtoffset;
        dp->dom_maxrtkey        = odp->dom_maxrtkey;
        dp->dom_protohdrlen     = odp->dom_protohdrlen;
        dp->dom_old             = odp;

        attach_domain(dp);
        init_domain(dp);

        /* Point the mutex back to the internal structure's */
        odp->dom_mtx            = dp->dom_mtx;
        domain_guard_release(guard);
}

/*
 * Exported (private) routine, indirection of net_del_domain.
 */
int
net_del_domain_old(struct domain_old *odp)
{
        struct domain *dp1, *dp2;
        int error = 0;
        domain_guard_t guard;

        VERIFY(odp != NULL);

        guard = domain_guard_deploy();
        if (odp->dom_refs != 0) {
                error = EBUSY;
                goto done;
        }

        TAILQ_FOREACH_SAFE(dp1, &domains, dom_entry, dp2) {
                if (!(dp1->dom_flags & DOM_OLD))
                        continue;
                VERIFY(dp1->dom_old != NULL);
                if (odp == dp1->dom_old)
                        break;
        }
        if (dp1 != NULL) {
                struct protosw *pp1, *pp2;

                VERIFY(dp1->dom_flags & DOM_OLD);
                VERIFY(dp1->dom_old == odp);

                /* Remove all protocols attached to this domain */
                TAILQ_FOREACH_SAFE(pp1, &dp1->dom_protosw, pr_entry, pp2) {
                        detach_proto(pp1, dp1);
                        if (pp1->pr_usrreqs->pru_flags & PRUF_OLD)
                                FREE(pp1->pr_usrreqs, M_TEMP);
                        if (pp1->pr_flags & PR_OLD)
                                FREE(pp1, M_TEMP);
                }

                detach_domain(dp1);
                FREE(dp1, M_TEMP);
        } else {
                error = EPFNOSUPPORT;
        }
done:
        domain_guard_release(guard);
        return (error);
}

/*
 * Internal routine, not exported.
 *
 * net_add_proto - link a protosw into a domain's protosw chain
 *
 * NOTE: Caller must have acquired domain_proto_mtx
 */
int
net_add_proto(struct protosw *pp, struct domain *dp, int doinit)
{
        struct protosw *pp1;

        /*
         * This could be called as part of initializing the domain,
         * and thus DOM_INITIALIZED may not be set (yet).
         */
        domain_proto_mtx_lock_assert_held();
        VERIFY(!(pp->pr_flags & PR_ATTACHED));

        /* pr_domain is set only after the protocol is attached */
        if (pp->pr_domain != NULL) {
                panic("%s: domain (%d,%s), proto %d has non-NULL pr_domain!\n",
                    __func__, dp->dom_family, dp->dom_name, pp->pr_protocol);
                /* NOTREACHED */
        }

        if (pp->pr_usrreqs == NULL) {
                panic("%s: domain (%d,%s), proto %d has no usrreqs!\n",
                    __func__, dp->dom_family, dp->dom_name, pp->pr_protocol);
                /* NOTREACHED */
        }

        TAILQ_FOREACH(pp1, &dp->dom_protosw, pr_entry) {
                if (pp1->pr_type == pp->pr_type &&
                    pp1->pr_protocol == pp->pr_protocol)
                        return (EEXIST);
        }

        attach_proto(pp, dp);
        if (doinit)
                net_init_proto(pp, dp);

        return (0);
}

void
net_init_proto(struct protosw *pp, struct domain *dp)
{
        /*
         * This could be called as part of initializing the domain,
         * and thus DOM_INITIALIZED may not be set (yet).  The protocol
         * must have been attached via net_addr_protosw() by now.
         */
        domain_proto_mtx_lock_assert_held();
        VERIFY(pp->pr_flags & PR_ATTACHED);

        init_proto(pp, dp);
}

/*
 * Exported (private) routine, indirection of net_add_proto.
 */
int
net_add_proto_old(struct protosw_old *opp, struct domain_old *odp)
{
        struct pr_usrreqs_old *opru;
        struct pr_usrreqs *pru = NULL;
        struct protosw *pp = NULL, *pp1;
        int error = 0;
        struct domain *dp;
        domain_guard_t guard;

        /*
         * This could be called as part of initializing the domain,
         * and thus DOM_INITIALIZED may not be set (yet).
         */
        guard = domain_guard_deploy();

        /* Make sure the domain has been added via net_add_domain */
        TAILQ_FOREACH(dp, &domains, dom_entry) {
                if (!(dp->dom_flags & DOM_OLD))
                        continue;
                if (dp->dom_old == odp)
                        break;
        }
        if (dp == NULL) {
                error = EINVAL;
                goto done;
        }

        TAILQ_FOREACH(pp1, &dp->dom_protosw, pr_entry) {
                if (pp1->pr_type == opp->pr_type &&
                    pp1->pr_protocol == opp->pr_protocol) {
                        error = EEXIST;
                        goto done;
                }
        }

        if ((opru = opp->pr_usrreqs) == NULL) {
                panic("%s: domain (%d,%s), proto %d has no usrreqs!\n",
                    __func__, odp->dom_family, odp->dom_name, opp->pr_protocol);
                /* NOTREACHED */
        }

        pru = _MALLOC(sizeof (*pru), M_TEMP, M_WAITOK | M_ZERO);
        if (pru == NULL) {
                error = ENOMEM;
                goto done;
        }

        pru->pru_flags          = PRUF_OLD;
        pru->pru_abort          = opru->pru_abort;
        pru->pru_accept         = opru->pru_accept;
        pru->pru_attach         = opru->pru_attach;
        pru->pru_bind           = opru->pru_bind;
        pru->pru_connect        = opru->pru_connect;
        pru->pru_connect2       = opru->pru_connect2;
        pru->pru_control        = opru->pru_control;
        pru->pru_detach         = opru->pru_detach;
        pru->pru_disconnect     = opru->pru_disconnect;
        pru->pru_listen         = opru->pru_listen;
        pru->pru_peeraddr       = opru->pru_peeraddr;
        pru->pru_rcvd           = opru->pru_rcvd;
        pru->pru_rcvoob         = opru->pru_rcvoob;
        pru->pru_send           = opru->pru_send;
        pru->pru_sense          = opru->pru_sense;
        pru->pru_shutdown       = opru->pru_shutdown;
        pru->pru_sockaddr       = opru->pru_sockaddr;
        pru->pru_sosend         = opru->pru_sosend;
        pru->pru_soreceive      = opru->pru_soreceive;
        pru->pru_sopoll         = opru->pru_sopoll;

        pp = _MALLOC(sizeof (*pp), M_TEMP, M_WAITOK | M_ZERO);
        if (pp == NULL) {
                error = ENOMEM;
                goto done;
        }

        /*
         * Protocol fast and slow timers are now deprecated.
         */
        if (opp->pr_unused != NULL) {
                printf("%s: domain (%d,%s), proto %d: pr_fasttimo is "
                    "deprecated and won't be called\n", __func__,
                    odp->dom_family, odp->dom_name, opp->pr_protocol);
        }
        if (opp->pr_unused2 != NULL) {
                printf("%s: domain (%d,%s), proto %d: pr_slowtimo is "
                    "deprecated and won't be called\n", __func__,
                    odp->dom_family, odp->dom_name, opp->pr_protocol);
        }

        /* Copy everything but pr_init, pr_next, pr_domain, pr_protosw */
        pp->pr_type             = opp->pr_type;
        pp->pr_protocol         = opp->pr_protocol;
        pp->pr_flags            = (opp->pr_flags & PRF_USERFLAGS) | PR_OLD;
        pp->pr_input            = opp->pr_input;
        pp->pr_output           = opp->pr_output;
        pp->pr_ctlinput         = opp->pr_ctlinput;
        pp->pr_ctloutput        = opp->pr_ctloutput;
        pp->pr_usrreqs          = pru;
        pp->pr_init             = pr_init_old;
        pp->pr_drain            = opp->pr_drain;
        pp->pr_sysctl           = opp->pr_sysctl;
        pp->pr_lock             = opp->pr_lock;
        pp->pr_unlock           = opp->pr_unlock;
        pp->pr_getlock          = opp->pr_getlock;
        pp->pr_old              = opp;

        /* attach as well as initialize */
        attach_proto(pp, dp);
        net_init_proto(pp, dp);
done:
        if (error != 0) {
                printf("%s: domain (%d,%s), proto %d: failed to attach, "
                    "error %d\n", __func__, odp->dom_family,
                    odp->dom_name, opp->pr_protocol, error);

                if (pru != NULL)
                        FREE(pru, M_TEMP);
                if (pp != NULL)
                        FREE(pp, M_TEMP);
        }

        domain_guard_release(guard);
        return (error);
}

/*
 * Internal routine, not exported.
 *
 * net_del_proto - remove a protosw from a domain's protosw chain.
 * Search the protosw chain for the element with matching data.
 * Then unlink and return.
 *
 * NOTE: Caller must have acquired domain_proto_mtx
 */
int
net_del_proto(int type, int protocol, struct domain *dp)
{
        struct protosw *pp;

        /*
         * This could be called as part of initializing the domain,
         * and thus DOM_INITIALIZED may not be set (yet).
         */
        domain_proto_mtx_lock_assert_held();

        TAILQ_FOREACH(pp, &dp->dom_protosw, pr_entry) {
                if (pp->pr_type == type && pp->pr_protocol == protocol)
                        break;
        }
        if (pp == NULL)
                return (ENXIO);

        detach_proto(pp, dp);
        if (pp->pr_usrreqs->pru_flags & PRUF_OLD)
                FREE(pp->pr_usrreqs, M_TEMP);
        if (pp->pr_flags & PR_OLD)
                FREE(pp, M_TEMP);

        return (0);
}

/*
 * Exported (private) routine, indirection of net_del_proto.
 */
int
net_del_proto_old(int type, int protocol, struct domain_old *odp)
{
        int error = 0;
        struct protosw *pp;
        struct domain *dp;
        domain_guard_t guard;

        /*
         * This could be called as part of initializing the domain,
         * and thus DOM_INITIALIZED may not be set (yet).
         */
        guard = domain_guard_deploy();

        /* Make sure the domain has been added via net_add_domain */
        TAILQ_FOREACH(dp, &domains, dom_entry) {
                if (!(dp->dom_flags & DOM_OLD))
                        continue;
                if (dp->dom_old == odp)
                        break;
        }
        if (dp == NULL) {
                error = ENXIO;
                goto done;
        }

        TAILQ_FOREACH(pp, &dp->dom_protosw, pr_entry) {
                if (pp->pr_type == type && pp->pr_protocol == protocol)
                        break;
        }
        if (pp == NULL) {
                error = ENXIO;
                goto done;
        }
        detach_proto(pp, dp);
        if (pp->pr_usrreqs->pru_flags & PRUF_OLD)
                FREE(pp->pr_usrreqs, M_TEMP);
        if (pp->pr_flags & PR_OLD)
                FREE(pp, M_TEMP);

done:
        domain_guard_release(guard);
        return (error);
}

static void
domain_sched_timeout(void)
{
        lck_mtx_assert(&domain_timeout_mtx, LCK_MTX_ASSERT_OWNED);

        if (!domain_timeout_run && domain_draining) {
                domain_timeout_run = TRUE;
                timeout(domain_timeout, NULL, hz);
        }
}

void
net_drain_domains(void)
{
        lck_mtx_lock(&domain_timeout_mtx);
        domain_draining = TRUE;
        domain_sched_timeout();
        lck_mtx_unlock(&domain_timeout_mtx);
}

#if INET6
extern struct domain inet6domain_s;
#endif
#if IPSEC
extern struct domain keydomain_s;
#endif

extern struct domain routedomain_s, ndrvdomain_s, inetdomain_s;
extern struct domain systemdomain_s, localdomain_s;

#if MULTIPATH
extern struct domain mpdomain_s;
#endif /* MULTIPATH */

static void
domain_timeout(void *arg)
{
#pragma unused(arg)
        struct protosw *pp;
        struct domain *dp;
        domain_guard_t guard;

        lck_mtx_lock(&domain_timeout_mtx);
        if (domain_draining) {
                domain_draining = FALSE;
                lck_mtx_unlock(&domain_timeout_mtx);

                guard = domain_guard_deploy();
                TAILQ_FOREACH(dp, &domains, dom_entry) {
                        TAILQ_FOREACH(pp, &dp->dom_protosw, pr_entry) {
                                if (pp->pr_drain != NULL)
                                        (*pp->pr_drain)();
                        }
                }
                domain_guard_release(guard);

                lck_mtx_lock(&domain_timeout_mtx);
        }

        /* re-arm the timer if there's work to do */
        domain_timeout_run = FALSE;
        domain_sched_timeout();
        lck_mtx_unlock(&domain_timeout_mtx);
}

void
domaininit(void)
{
        struct domain *dp;
        domain_guard_t guard;

        /*
         * allocate lock group attribute and group for domain mutexes
         */
        domain_proto_mtx_grp_attr = lck_grp_attr_alloc_init();

        domain_proto_mtx_grp = lck_grp_alloc_init("domain",
            domain_proto_mtx_grp_attr);

        /*
         * allocate the lock attribute for per domain mutexes
         */
        domain_proto_mtx_attr = lck_attr_alloc_init();

        lck_mtx_init(&domain_proto_mtx, domain_proto_mtx_grp,
            domain_proto_mtx_attr);
        lck_mtx_init(&domain_timeout_mtx, domain_proto_mtx_grp,
            domain_proto_mtx_attr);

        guard = domain_guard_deploy();
        /*
         * Add all the static domains to the domains list.  route domain
         * gets added and initialized last, since we need it to attach
         * rt_tables[] to everything that's already there.  This also
         * means that domains added after this point won't get their
         * dom_rtattach() called on rt_tables[].
         */
        attach_domain(&inetdomain_s);
#if INET6
        attach_domain(&inet6domain_s);
#endif /* INET6 */
#if MULTIPATH
        attach_domain(&mpdomain_s);
#endif /* MULTIPATH */
        attach_domain(&systemdomain_s);
        attach_domain(&localdomain_s);
#if IPSEC
        attach_domain(&keydomain_s);
#endif /* IPSEC */
        attach_domain(&ndrvdomain_s);
        attach_domain(&routedomain_s);  /* must be last domain */

        /*
         * Now ask them all to init (XXX including the routing domain,
         * see above)
         */
        TAILQ_FOREACH(dp, &domains, dom_entry)
                init_domain(dp);

        domain_guard_release(guard);
}

static __inline__ struct domain *
pffinddomain_locked(int pf)
{
        struct domain *dp;

        domain_proto_mtx_lock_assert_held();

        TAILQ_FOREACH(dp, &domains, dom_entry) {
                if (dp->dom_family == pf)
                        break;
        }
        return (dp);
}

struct protosw *
pffindtype(int family, int type)
{
        struct protosw *pp = NULL;
        struct domain *dp;
        domain_guard_t guard;

        guard = domain_guard_deploy();
        if ((dp = pffinddomain_locked(family)) == NULL)
                goto done;

        TAILQ_FOREACH(pp, &dp->dom_protosw, pr_entry) {
                if (pp->pr_type != 0 && pp->pr_type == type)
                        goto done;
        }
done:
        domain_guard_release(guard);
        return (pp);
}

/*
 * Internal routine, not exported.
 */
struct domain *
pffinddomain(int pf)
{
        struct domain *dp;
        domain_guard_t guard;

        guard = domain_guard_deploy();
        dp = pffinddomain_locked(pf);
        domain_guard_release(guard);
        return (dp);
}

/*
 * Exported (private) routine, indirection of pffinddomain.
 */
struct domain_old *
pffinddomain_old(int pf)
{
        struct domain_old *odp = NULL;
        struct domain *dp;
        domain_guard_t guard;

        guard = domain_guard_deploy();
        if ((dp = pffinddomain_locked(pf)) != NULL && (dp->dom_flags & DOM_OLD))
                odp = dp->dom_old;
        domain_guard_release(guard);
        return (odp);
}

/*
 * Internal routine, not exported.
 */
struct protosw *
pffindproto(int family, int protocol, int type)
{
        struct protosw *pp;
        domain_guard_t guard;

        guard = domain_guard_deploy();
        pp = pffindproto_locked(family, protocol, type);
        domain_guard_release(guard);
        return (pp);
}

struct protosw *
pffindproto_locked(int family, int protocol, int type)
{
        struct protosw *maybe = NULL;
        struct protosw *pp;
        struct domain *dp;

        domain_proto_mtx_lock_assert_held();

        if (family == 0)
                return (0);

        dp = pffinddomain_locked(family);
        if (dp == NULL)
                return (NULL);

        TAILQ_FOREACH(pp, &dp->dom_protosw, pr_entry) {
                if ((pp->pr_protocol == protocol) && (pp->pr_type == type))
                        return (pp);

                if (type == SOCK_RAW && pp->pr_type == SOCK_RAW &&
                    pp->pr_protocol == 0 && maybe == NULL)
                        maybe = pp;
        }
        return (maybe);
}

/*
 * Exported (private) routine, indirection of pffindproto.
 */
struct protosw_old *
pffindproto_old(int family, int protocol, int type)
{
        struct protosw_old *opr = NULL;
        struct protosw *pp;
        domain_guard_t guard;

        guard = domain_guard_deploy();
        if ((pp = pffindproto_locked(family, protocol, type)) != NULL &&
            (pp->pr_flags & PR_OLD))
                opr = pp->pr_old;
        domain_guard_release(guard);
        return (opr);
}

static struct protosw *
pffindprotonotype_locked(int family, int protocol, int type)
{
#pragma unused(type)
        struct domain *dp;
        struct protosw *pp;

        domain_proto_mtx_lock_assert_held();

        if (family == 0)
                return (0);

        dp = pffinddomain_locked(family);
        if (dp == NULL)
                return (NULL);

        TAILQ_FOREACH(pp, &dp->dom_protosw, pr_entry) {
                if (pp->pr_protocol == protocol)
                        return (pp);
        }
        return (NULL);
}

struct protosw *
pffindprotonotype(int family, int protocol)
{
        struct protosw *pp;
        domain_guard_t guard;

        if (protocol == 0)
                return (NULL);

        guard = domain_guard_deploy();
        pp = pffindprotonotype_locked(family, protocol, 0);
        domain_guard_release(guard);
        return (pp);
}

void
pfctlinput(int cmd, struct sockaddr *sa)
{
        pfctlinput2(cmd, sa, NULL);
}

void
pfctlinput2(int cmd, struct sockaddr *sa, void *ctlparam)
{
        struct domain *dp;
        struct protosw *pp;
        domain_guard_t guard;

        if (sa == NULL)
                return;

        guard = domain_guard_deploy();
        TAILQ_FOREACH(dp, &domains, dom_entry) {
                TAILQ_FOREACH(pp, &dp->dom_protosw, pr_entry) {
                        if (pp->pr_ctlinput != NULL)
                                (*pp->pr_ctlinput)(cmd, sa, ctlparam);
                }
        }
        domain_guard_release(guard);
}

void
net_update_uptime(void)
{
        struct timeval tv;

        microuptime(&tv);
        _net_uptime = tv.tv_sec;
        /*
         * Round up the timer to the nearest integer value because otherwise
         * we might setup networking timers that are off by almost 1 second.
         */
        if (tv.tv_usec > 500000)
                _net_uptime++;
}

void
net_update_uptime_secs(uint64_t secs)
{
        _net_uptime = secs;
}

/*
 * Convert our uin64_t net_uptime to a struct timeval.
 */
void
net_uptime2timeval(struct timeval *tv)
{
        if (tv == NULL)
                return;

        tv->tv_usec = 0;
        tv->tv_sec = net_uptime();
}

/*
 * An alternative way to obtain the coarse-grained uptime (in seconds)
 * for networking code which do not require high-precision timestamp,
 * as this is significantly cheaper than microuptime().
 */
u_int64_t
net_uptime(void)
{
        if (_net_uptime == 0)
                net_update_uptime();

        return (_net_uptime);
}

void
domain_proto_mtx_lock_assert_held(void)
{
        lck_mtx_assert(&domain_proto_mtx, LCK_MTX_ASSERT_OWNED);
}

void
domain_proto_mtx_lock_assert_notheld(void)
{
        lck_mtx_assert(&domain_proto_mtx, LCK_MTX_ASSERT_NOTOWNED);
}

domain_guard_t
domain_guard_deploy(void)
{
        net_thread_marks_t marks;

        marks = net_thread_marks_push(NET_THREAD_HELD_DOMAIN);
        if (marks != net_thread_marks_none) {
                lck_mtx_assert(&domain_proto_mtx, LCK_MTX_ASSERT_NOTOWNED);
                lck_mtx_lock(&domain_proto_mtx);
        }
        else
                lck_mtx_assert(&domain_proto_mtx, LCK_MTX_ASSERT_OWNED);

        return ((domain_guard_t)(const void*)marks);
}

void
domain_guard_release(domain_guard_t guard)
{
        net_thread_marks_t marks = (net_thread_marks_t)(const void*)guard;

        if (marks != net_thread_marks_none) {
                lck_mtx_assert(&domain_proto_mtx, LCK_MTX_ASSERT_OWNED);
                lck_mtx_unlock(&domain_proto_mtx);
                net_thread_marks_pop(marks);
        }
        else
                lck_mtx_assert(&domain_proto_mtx, LCK_MTX_ASSERT_NOTOWNED);
}

domain_unguard_t
domain_unguard_deploy(void)
{
        net_thread_marks_t marks;

        marks = net_thread_unmarks_push(NET_THREAD_HELD_DOMAIN);
        if (marks != net_thread_marks_none) {
                lck_mtx_assert(&domain_proto_mtx, LCK_MTX_ASSERT_OWNED);
                lck_mtx_unlock(&domain_proto_mtx);
        }
        else
                lck_mtx_assert(&domain_proto_mtx, LCK_MTX_ASSERT_NOTOWNED);

        return ((domain_unguard_t)(const void*)marks);
}

void
domain_unguard_release(domain_unguard_t unguard)
{
        net_thread_marks_t marks = (net_thread_marks_t)(const void*)unguard;

        if (marks != net_thread_marks_none) {
                lck_mtx_assert(&domain_proto_mtx, LCK_MTX_ASSERT_NOTOWNED);
                lck_mtx_lock(&domain_proto_mtx);
                net_thread_unmarks_pop(marks);
        }
        else
                lck_mtx_assert(&domain_proto_mtx, LCK_MTX_ASSERT_OWNED);
}

#if (DEVELOPMENT || DEBUG)
 
static int
sysctl_do_drain_domains SYSCTL_HANDLER_ARGS
{
#pragma unused(arg1, arg2)
        int error;
        int dummy = 0;

        error = sysctl_handle_int(oidp, &dummy, 0, req);        
        if (error || req->newptr == USER_ADDR_NULL)
                return (error);

        net_drain_domains();

        return (0);
}

#endif /* DEVELOPMENT || DEBUG */