xnu-4570.41.2.tar.gz

[apple/xnu.git] / bsd / net / if.c

/*
 * Copyright (c) 2000-2017 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) 1980, 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.
 *
 *      @(#)if.c        8.3 (Berkeley) 1/4/94
 * $FreeBSD: src/sys/net/if.c,v 1.85.2.9 2001/07/24 19:10:17 brooks Exp $
 */
/*
 * NOTICE: This file was modified by SPARTA, Inc. in 2006 to introduce
 * support for mandatory and extensible security protections.  This notice
 * is included in support of clause 2.2 (b) of the Apple Public License,
 * Version 2.0.
 */

#include <kern/locks.h>

#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/kernel.h>
#include <sys/sockio.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <sys/mcache.h>
#include <sys/kauth.h>
#include <sys/priv.h>
#include <kern/zalloc.h>
#include <mach/boolean.h>

#include <machine/endian.h>

#include <pexpert/pexpert.h>

#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <net/if_ppp.h>
#include <net/ethernet.h>
#include <net/network_agent.h>
#include <net/radix.h>
#include <net/route.h>
#include <net/dlil.h>
#include <net/nwk_wq.h>

#include <sys/domain.h>
#include <libkern/OSAtomic.h>

#if INET || INET6
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_tclass.h>
#include <netinet/ip_var.h>
#include <netinet/ip6.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#if INET6
#include <netinet6/in6_var.h>
#include <netinet6/in6_ifattach.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#endif /* INET6 */
#endif /* INET || INET6 */

#if CONFIG_MACF_NET
#include <security/mac_framework.h>
#endif

/*
 * System initialization
 */

extern char *proc_name_address(void *);

/* Lock group and attribute for ifaddr lock */
lck_attr_t      *ifa_mtx_attr;
lck_grp_t       *ifa_mtx_grp;
static lck_grp_attr_t   *ifa_mtx_grp_attr;

static int ifioctl_ifreq(struct socket *, u_long, struct ifreq *,
    struct proc *);
static int ifioctl_ifconf(u_long, caddr_t);
static int ifioctl_ifclone(u_long, caddr_t);
static int ifioctl_iforder(u_long, caddr_t);
static int ifioctl_ifdesc(struct ifnet *, u_long, caddr_t, struct proc *);
static int ifioctl_linkparams(struct ifnet *, u_long, caddr_t, struct proc *);
static int ifioctl_qstats(struct ifnet *, u_long, caddr_t);
static int ifioctl_throttle(struct ifnet *, u_long, caddr_t, struct proc *);
static int ifioctl_netsignature(struct ifnet *, u_long, caddr_t);
static int ifconf(u_long cmd, user_addr_t ifrp, int * ret_space);
__private_extern__ void link_rtrequest(int, struct rtentry *, struct sockaddr *);
void if_rtproto_del(struct ifnet *ifp, int protocol);

static int if_addmulti_common(struct ifnet *, const struct sockaddr *,
    struct ifmultiaddr **, int);
static int if_delmulti_common(struct ifmultiaddr *, struct ifnet *,
    const struct sockaddr *, int);
static struct ifnet *ifunit_common(const char *, boolean_t);

static int if_rtmtu(struct radix_node *, void *);
static void if_rtmtu_update(struct ifnet *);

static int if_clone_list(int, int *, user_addr_t);

MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");

struct  ifnethead ifnet_head = TAILQ_HEAD_INITIALIZER(ifnet_head);

/* ifnet_ordered_head and if_ordered_count are protected by the ifnet_head lock */
struct  ifnethead ifnet_ordered_head = TAILQ_HEAD_INITIALIZER(ifnet_ordered_head);
static  u_int32_t if_ordered_count = 0;

static int      if_cloners_count;
LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);

static struct ifaddr *ifa_ifwithnet_common(const struct sockaddr *,
    unsigned int);
static void if_attach_ifa_common(struct ifnet *, struct ifaddr *, int);
static void if_detach_ifa_common(struct ifnet *, struct ifaddr *, int);

static void if_attach_ifma(struct ifnet *, struct ifmultiaddr *, int);
static int if_detach_ifma(struct ifnet *, struct ifmultiaddr *, int);

static struct ifmultiaddr *ifma_alloc(int);
static void ifma_free(struct ifmultiaddr *);
static void ifma_trace(struct ifmultiaddr *, int);

#if DEBUG
static unsigned int ifma_debug = 1;     /* debugging (enabled) */
#else
static unsigned int ifma_debug;         /* debugging (disabled) */
#endif /* !DEBUG */
static unsigned int ifma_size;          /* size of zone element */
static struct zone *ifma_zone;          /* zone for ifmultiaddr */

#define IFMA_TRACE_HIST_SIZE    32      /* size of trace history */

/* For gdb */
__private_extern__ unsigned int ifma_trace_hist_size = IFMA_TRACE_HIST_SIZE;

struct ifmultiaddr_dbg {
        struct ifmultiaddr      ifma;                   /* ifmultiaddr */
        u_int16_t               ifma_refhold_cnt;       /* # of ref */
        u_int16_t               ifma_refrele_cnt;       /* # of rele */
        /*
         * Circular lists of IFA_ADDREF and IFA_REMREF callers.
         */
        ctrace_t                ifma_refhold[IFMA_TRACE_HIST_SIZE];
        ctrace_t                ifma_refrele[IFMA_TRACE_HIST_SIZE];
        /*
         * Trash list linkage
         */
        TAILQ_ENTRY(ifmultiaddr_dbg) ifma_trash_link;
};

/* List of trash ifmultiaddr entries protected by ifma_trash_lock */
static TAILQ_HEAD(, ifmultiaddr_dbg) ifma_trash_head;
static decl_lck_mtx_data(, ifma_trash_lock);

#define IFMA_ZONE_MAX           64              /* maximum elements in zone */
#define IFMA_ZONE_NAME          "ifmultiaddr"   /* zone name */

#if INET6
/*
 * XXX: declare here to avoid to include many inet6 related files..
 * should be more generalized?
 */
extern void     nd6_setmtu(struct ifnet *);
extern lck_mtx_t *nd6_mutex;
#endif

SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW|CTLFLAG_LOCKED, 0, "Link layers");
SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW|CTLFLAG_LOCKED, 0,
        "Generic link-management");

SYSCTL_DECL(_net_link_generic_system);

static uint32_t if_verbose = 0;
SYSCTL_INT(_net_link_generic_system, OID_AUTO, if_verbose,
    CTLFLAG_RW | CTLFLAG_LOCKED, &if_verbose, 0, "");

boolean_t intcoproc_unrestricted;

/* Eventhandler context for interface events */
struct eventhandler_lists_ctxt ifnet_evhdlr_ctxt;

void
ifa_init(void)
{
        /* Setup lock group and attribute for ifaddr */
        ifa_mtx_grp_attr = lck_grp_attr_alloc_init();
        ifa_mtx_grp = lck_grp_alloc_init("ifaddr", ifa_mtx_grp_attr);
        ifa_mtx_attr = lck_attr_alloc_init();

        PE_parse_boot_argn("ifa_debug", &ifma_debug, sizeof (ifma_debug));

        ifma_size = (ifma_debug == 0) ? sizeof (struct ifmultiaddr) :
            sizeof (struct ifmultiaddr_dbg);

        ifma_zone = zinit(ifma_size, IFMA_ZONE_MAX * ifma_size, 0,
            IFMA_ZONE_NAME);
        if (ifma_zone == NULL) {
                panic("%s: failed allocating %s", __func__, IFMA_ZONE_NAME);
                /* NOTREACHED */
        }
        zone_change(ifma_zone, Z_EXPAND, TRUE);
        zone_change(ifma_zone, Z_CALLERACCT, FALSE);

        lck_mtx_init(&ifma_trash_lock, ifa_mtx_grp, ifa_mtx_attr);
        TAILQ_INIT(&ifma_trash_head);

        PE_parse_boot_argn("intcoproc_unrestricted", &intcoproc_unrestricted,
           sizeof (intcoproc_unrestricted));
}

/*
 * Network interface utility routines.
 *
 * Routines with ifa_ifwith* names take sockaddr *'s as
 * parameters.
 */

int if_index;
struct ifaddr **ifnet_addrs;
struct ifnet **ifindex2ifnet;

__private_extern__ void
if_attach_ifa(struct ifnet *ifp, struct ifaddr *ifa)
{
        if_attach_ifa_common(ifp, ifa, 0);
}

__private_extern__ void
if_attach_link_ifa(struct ifnet *ifp, struct ifaddr *ifa)
{
        if_attach_ifa_common(ifp, ifa, 1);
}

static void
if_attach_ifa_common(struct ifnet *ifp, struct ifaddr *ifa, int link)
{
        ifnet_lock_assert(ifp, IFNET_LCK_ASSERT_EXCLUSIVE);
        IFA_LOCK_ASSERT_HELD(ifa);

        if (ifa->ifa_ifp != ifp) {
                panic("%s: Mismatch ifa_ifp=%p != ifp=%p", __func__,
                    ifa->ifa_ifp, ifp);
                /* NOTREACHED */
        } else if (ifa->ifa_debug & IFD_ATTACHED) {
                panic("%s: Attempt to attach an already attached ifa=%p",
                    __func__, ifa);
                /* NOTREACHED */
        } else if (link && !(ifa->ifa_debug & IFD_LINK)) {
                panic("%s: Unexpected non-link address ifa=%p", __func__, ifa);
                /* NOTREACHED */
        } else if (!link && (ifa->ifa_debug & IFD_LINK)) {
                panic("%s: Unexpected link address ifa=%p", __func__, ifa);
                /* NOTREACHED */
        }
        IFA_ADDREF_LOCKED(ifa);
        ifa->ifa_debug |= IFD_ATTACHED;
        if (link)
                TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
        else
                TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);

        if (ifa->ifa_attached != NULL)
                (*ifa->ifa_attached)(ifa);
}

__private_extern__ void
if_detach_ifa(struct ifnet *ifp, struct ifaddr *ifa)
{
        if_detach_ifa_common(ifp, ifa, 0);
}

__private_extern__ void
if_detach_link_ifa(struct ifnet *ifp, struct ifaddr *ifa)
{
        if_detach_ifa_common(ifp, ifa, 1);
}

static void
if_detach_ifa_common(struct ifnet *ifp, struct ifaddr *ifa, int link)
{
        ifnet_lock_assert(ifp, IFNET_LCK_ASSERT_EXCLUSIVE);
        IFA_LOCK_ASSERT_HELD(ifa);

        if (link && !(ifa->ifa_debug & IFD_LINK)) {
                panic("%s: Unexpected non-link address ifa=%p", __func__, ifa);
                /* NOTREACHED */
        } else if (link && ifa != TAILQ_FIRST(&ifp->if_addrhead)) {
                panic("%s: Link address ifa=%p not first", __func__, ifa);
                /* NOTREACHED */
        } else if (!link && (ifa->ifa_debug & IFD_LINK)) {
                panic("%s: Unexpected link address ifa=%p", __func__, ifa);
                /* NOTREACHED */
        } else if (!(ifa->ifa_debug & IFD_ATTACHED)) {
                panic("%s: Attempt to detach an unattached address ifa=%p",
                    __func__, ifa);
                /* NOTREACHED */
        } else if (ifa->ifa_ifp != ifp) {
                panic("%s: Mismatch ifa_ifp=%p, ifp=%p", __func__,
                    ifa->ifa_ifp, ifp);
                /* NOTREACHED */
        } else if (ifa->ifa_debug & IFD_DEBUG) {
                struct ifaddr *ifa2;
                TAILQ_FOREACH(ifa2, &ifp->if_addrhead, ifa_link) {
                        if (ifa2 == ifa)
                                break;
                }
                if (ifa2 != ifa) {
                        panic("%s: Attempt to detach a stray address ifa=%p",
                            __func__, ifa);
                        /* NOTREACHED */
                }
        }
        TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
        /* This must not be the last reference to the ifaddr */
        if (IFA_REMREF_LOCKED(ifa) == NULL) {
                panic("%s: unexpected (missing) refcnt ifa=%p", __func__, ifa);
                /* NOTREACHED */
        }
        ifa->ifa_debug &= ~(IFD_ATTACHED | IFD_DETACHING);

        if (ifa->ifa_detached != NULL)
                (*ifa->ifa_detached)(ifa);

}

#define INITIAL_IF_INDEXLIM     8

/*
 * Function: if_next_index
 * Purpose:
 *   Return the next available interface index.
 *   Grow the ifnet_addrs[] and ifindex2ifnet[] arrays to accomodate the
 *   added entry when necessary.
 *
 * Note:
 *   ifnet_addrs[] is indexed by (if_index - 1), whereas
 *   ifindex2ifnet[] is indexed by ifp->if_index.  That requires us to
 *   always allocate one extra element to hold ifindex2ifnet[0], which
 *   is unused.
 */
int if_next_index(void);

__private_extern__ int
if_next_index(void)
{
        static int      if_indexlim = 0;
        int             new_index;

        new_index = ++if_index;
        if (if_index > if_indexlim) {
                unsigned        n;
                int             new_if_indexlim;
                caddr_t         new_ifnet_addrs;
                caddr_t         new_ifindex2ifnet;
                caddr_t         old_ifnet_addrs;

                old_ifnet_addrs = (caddr_t)ifnet_addrs;
                if (ifnet_addrs == NULL) {
                        new_if_indexlim = INITIAL_IF_INDEXLIM;
                } else {
                        new_if_indexlim = if_indexlim << 1;
                }

                /* allocate space for the larger arrays */
                n = (2 * new_if_indexlim + 1) * sizeof(caddr_t);
                new_ifnet_addrs = _MALLOC(n, M_IFADDR, M_WAITOK | M_ZERO);
                if (new_ifnet_addrs == NULL) {
                        --if_index;
                        return (-1);
                }

                new_ifindex2ifnet = new_ifnet_addrs
                        + new_if_indexlim * sizeof(caddr_t);
                if (ifnet_addrs != NULL) {
                        /* copy the existing data */
                        bcopy((caddr_t)ifnet_addrs, new_ifnet_addrs,
                            if_indexlim * sizeof(caddr_t));
                        bcopy((caddr_t)ifindex2ifnet,
                            new_ifindex2ifnet,
                            (if_indexlim + 1) * sizeof(caddr_t));
                }

                /* switch to the new tables and size */
                ifnet_addrs = (struct ifaddr **)(void *)new_ifnet_addrs;
                ifindex2ifnet = (struct ifnet **)(void *)new_ifindex2ifnet;
                if_indexlim = new_if_indexlim;

                /* release the old data */
                if (old_ifnet_addrs != NULL) {
                        _FREE((caddr_t)old_ifnet_addrs, M_IFADDR);
                }
        }
        return (new_index);
}

/*
 * Create a clone network interface.
 */
static int
if_clone_create(char *name, int len, void *params)
{
        struct if_clone *ifc;
        char *dp;
        int wildcard;
        u_int32_t bytoff, bitoff;
        u_int32_t unit;
        int err;

        ifc = if_clone_lookup(name, &unit);
        if (ifc == NULL)
                return (EINVAL);

        if (ifunit(name) != NULL)
                return (EEXIST);

        bytoff = bitoff = 0;
        wildcard = (unit == UINT32_MAX);
        /*
         * Find a free unit if none was given.
         */
        if (wildcard) {
                while ((bytoff < ifc->ifc_bmlen) &&
                    (ifc->ifc_units[bytoff] == 0xff))
                        bytoff++;
                if (bytoff >= ifc->ifc_bmlen)
                        return (ENOSPC);
                while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0)
                        bitoff++;
                unit = (bytoff << 3) + bitoff;
        }

        if (unit > ifc->ifc_maxunit)
                return (ENXIO);

        err = (*ifc->ifc_create)(ifc, unit, params);
        if (err != 0)
                return (err);

        if (!wildcard) {
                bytoff = unit >> 3;
                bitoff = unit - (bytoff << 3);
        }

        /*
         * Allocate the unit in the bitmap.
         */
        KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0,
            ("%s: bit is already set", __func__));
        ifc->ifc_units[bytoff] |= (1 << bitoff);

        /* In the wildcard case, we need to update the name. */
        if (wildcard) {
                for (dp = name; *dp != '\0'; dp++);
                if (snprintf(dp, len - (dp-name), "%d", unit) >
                    len - (dp-name) - 1) {
                        /*
                         * This can only be a programmer error and
                         * there's no straightforward way to recover if
                         * it happens.
                         */
                        panic("%s: interface name too long", __func__);
                        /* NOTREACHED */
                }

        }

        return (0);
}

/*
 * Destroy a clone network interface.
 */
static int
if_clone_destroy(const char *name)
{
        struct if_clone *ifc;
        struct ifnet *ifp;
        int bytoff, bitoff;
        u_int32_t unit;

        ifc = if_clone_lookup(name, &unit);
        if (ifc == NULL)
                return (EINVAL);

        if (unit < ifc->ifc_minifs)
                return (EINVAL);

        ifp = ifunit(name);
        if (ifp == NULL)
                return (ENXIO);

        if (ifc->ifc_destroy == NULL)
                return (EOPNOTSUPP);

        (*ifc->ifc_destroy)(ifp);

        /*
         * Compute offset in the bitmap and deallocate the unit.
         */
        bytoff = unit >> 3;
        bitoff = unit - (bytoff << 3);
        KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0,
            ("%s: bit is already cleared", __func__));
        ifc->ifc_units[bytoff] &= ~(1 << bitoff);
        return (0);
}

/*
 * Look up a network interface cloner.
 */

__private_extern__ struct if_clone *
if_clone_lookup(const char *name, u_int32_t *unitp)
{
        struct if_clone *ifc;
        const char *cp;
        u_int32_t i;

        for (ifc = LIST_FIRST(&if_cloners); ifc != NULL; ) {
                for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) {
                        if (ifc->ifc_name[i] != *cp)
                                goto next_ifc;
                }
                goto found_name;
next_ifc:
                ifc = LIST_NEXT(ifc, ifc_list);
        }

        /* No match. */
        return ((struct if_clone *)NULL);

found_name:
        if (*cp == '\0') {
                i = UINT32_MAX;
        } else {
                for (i = 0; *cp != '\0'; cp++) {
                        if (*cp < '0' || *cp > '9') {
                                /* Bogus unit number. */
                                return (NULL);
                        }
                        i = (i * 10) + (*cp - '0');
                }
        }

        if (unitp != NULL)
                *unitp = i;
        return (ifc);
}

/*
 * Register a network interface cloner.
 */
int
if_clone_attach(struct if_clone *ifc)
{
        int bytoff, bitoff;
        int err;
        int len, maxclone;
        u_int32_t unit;

        KASSERT(ifc->ifc_minifs - 1 <= ifc->ifc_maxunit,
            ("%s: %s requested more units then allowed (%d > %d)",
            __func__, ifc->ifc_name, ifc->ifc_minifs,
            ifc->ifc_maxunit + 1));
        /*
         * Compute bitmap size and allocate it.
         */
        maxclone = ifc->ifc_maxunit + 1;
        len = maxclone >> 3;
        if ((len << 3) < maxclone)
                len++;
        ifc->ifc_units = _MALLOC(len, M_CLONE, M_WAITOK | M_ZERO);
        if (ifc->ifc_units == NULL)
                return (ENOBUFS);
        ifc->ifc_bmlen = len;

        LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
        if_cloners_count++;

        for (unit = 0; unit < ifc->ifc_minifs; unit++) {
                err = (*ifc->ifc_create)(ifc, unit, NULL);
                KASSERT(err == 0,
                    ("%s: failed to create required interface %s%d",
                    __func__, ifc->ifc_name, unit));

                /* Allocate the unit in the bitmap. */
                bytoff = unit >> 3;
                bitoff = unit - (bytoff << 3);
                ifc->ifc_units[bytoff] |= (1 << bitoff);
        }

        return (0);
}

/*
 * Unregister a network interface cloner.
 */
void
if_clone_detach(struct if_clone *ifc)
{
        LIST_REMOVE(ifc, ifc_list);
        FREE(ifc->ifc_units, M_CLONE);
        if_cloners_count--;
}

/*
 * Provide list of interface cloners to userspace.
 */
static int
if_clone_list(int count, int *ret_total, user_addr_t dst)
{
        char outbuf[IFNAMSIZ];
        struct if_clone *ifc;
        int error = 0;

        *ret_total = if_cloners_count;
        if (dst == USER_ADDR_NULL) {
                /* Just asking how many there are. */
                return (0);
        }

        if (count < 0)
                return (EINVAL);

        count = (if_cloners_count < count) ? if_cloners_count : count;

        for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0;
            ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) {
                bzero(outbuf, sizeof(outbuf));
                strlcpy(outbuf, ifc->ifc_name,
                    min(strlen(ifc->ifc_name), IFNAMSIZ));
                error = copyout(outbuf, dst, IFNAMSIZ);
                if (error)
                        break;
        }

        return (error);
}

u_int32_t
if_functional_type(struct ifnet *ifp, bool exclude_delegate)
{
        u_int32_t ret = IFRTYPE_FUNCTIONAL_UNKNOWN;
        if (ifp != NULL) {
                if (ifp->if_flags & IFF_LOOPBACK) {
                        ret = IFRTYPE_FUNCTIONAL_LOOPBACK;
                } else if ((exclude_delegate &&
                    (ifp->if_subfamily == IFNET_SUBFAMILY_WIFI)) ||
                    (!exclude_delegate && IFNET_IS_WIFI(ifp))) {
                        if (ifp->if_eflags & IFEF_AWDL)
                                ret = IFRTYPE_FUNCTIONAL_WIFI_AWDL;
                        else
                                ret = IFRTYPE_FUNCTIONAL_WIFI_INFRA;
                } else if ((exclude_delegate &&
                    (ifp->if_type == IFT_CELLULAR)) ||
                    (!exclude_delegate && IFNET_IS_CELLULAR(ifp))) {
                        ret = IFRTYPE_FUNCTIONAL_CELLULAR;
                } else if (IFNET_IS_INTCOPROC(ifp)) {
                        ret = IFRTYPE_FUNCTIONAL_INTCOPROC;
                } else if ((exclude_delegate &&
                    (ifp->if_family == IFNET_FAMILY_ETHERNET ||
                    ifp->if_family == IFNET_FAMILY_FIREWIRE)) ||
                    (!exclude_delegate && IFNET_IS_WIRED(ifp))) {
                        ret = IFRTYPE_FUNCTIONAL_WIRED;
                }
        }

        return (ret);
}

/*
 * Similar to ifa_ifwithaddr, except that this is IPv4 specific
 * and that it matches only the local (not broadcast) address.
 */
__private_extern__ struct in_ifaddr *
ifa_foraddr(unsigned int addr)
{
        return (ifa_foraddr_scoped(addr, IFSCOPE_NONE));
}

/*
 * Similar to ifa_foraddr, except with the added interface scope
 * constraint (unless the caller passes in IFSCOPE_NONE in which
 * case there is no scope restriction).
 */
__private_extern__ struct in_ifaddr *
ifa_foraddr_scoped(unsigned int addr, unsigned int scope)
{
        struct in_ifaddr *ia = NULL;

        lck_rw_lock_shared(in_ifaddr_rwlock);
        TAILQ_FOREACH(ia, INADDR_HASH(addr), ia_hash) {
                IFA_LOCK_SPIN(&ia->ia_ifa);
                if (ia->ia_addr.sin_addr.s_addr == addr &&
                    (scope == IFSCOPE_NONE || ia->ia_ifp->if_index == scope)) {
                        IFA_ADDREF_LOCKED(&ia->ia_ifa); /* for caller */
                        IFA_UNLOCK(&ia->ia_ifa);
                        break;
                }
                IFA_UNLOCK(&ia->ia_ifa);
        }
        lck_rw_done(in_ifaddr_rwlock);
        return (ia);
}

#if INET6
/*
 * Similar to ifa_foraddr, except that this for IPv6.
 */
__private_extern__ struct in6_ifaddr *
ifa_foraddr6(struct in6_addr *addr6)
{
        return (ifa_foraddr6_scoped(addr6, IFSCOPE_NONE));
}

__private_extern__ struct in6_ifaddr *
ifa_foraddr6_scoped(struct in6_addr *addr6, unsigned int scope)
{
        struct in6_ifaddr *ia = NULL;

        lck_rw_lock_shared(&in6_ifaddr_rwlock);
        for (ia = in6_ifaddrs; ia; ia = ia->ia_next) {
                IFA_LOCK(&ia->ia_ifa);
                if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, addr6) &&
                    (scope == IFSCOPE_NONE || ia->ia_ifp->if_index == scope)) {
                        IFA_ADDREF_LOCKED(&ia->ia_ifa); /* for caller */
                        IFA_UNLOCK(&ia->ia_ifa);
                        break;
                }
                IFA_UNLOCK(&ia->ia_ifa);
        }
        lck_rw_done(&in6_ifaddr_rwlock);

        return (ia);
}
#endif /* INET6 */

/*
 * Return the first (primary) address of a given family on an interface.
 */
__private_extern__ struct ifaddr *
ifa_ifpgetprimary(struct ifnet *ifp, int family)
{
        struct ifaddr *ifa;

        ifnet_lock_shared(ifp);
        TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
                IFA_LOCK_SPIN(ifa);
                if (ifa->ifa_addr->sa_family == family) {
                        IFA_ADDREF_LOCKED(ifa); /* for caller */
                        IFA_UNLOCK(ifa);
                        break;
                }
                IFA_UNLOCK(ifa);
        }
        ifnet_lock_done(ifp);

        return (ifa);
}

static inline int
ifa_equal(const struct sockaddr *sa1, const struct sockaddr *sa2)
{

        if (!sa1 || !sa2)
                return 0;
        if (sa1->sa_len != sa2->sa_len)
                return 0;

        return (bcmp(sa1, sa2, sa1->sa_len) == 0);
}

/*
 * Locate an interface based on a complete address.
 */
struct ifaddr *
ifa_ifwithaddr_locked(const struct sockaddr *addr)
{
        struct ifnet *ifp;
        struct ifaddr *ifa;
        struct ifaddr *result = NULL;

        for (ifp = ifnet_head.tqh_first; ifp && !result;
            ifp = ifp->if_link.tqe_next) {
                ifnet_lock_shared(ifp);
                for (ifa = ifp->if_addrhead.tqh_first; ifa;
                    ifa = ifa->ifa_link.tqe_next) {
                        IFA_LOCK_SPIN(ifa);
                        if (ifa->ifa_addr->sa_family != addr->sa_family) {
                                IFA_UNLOCK(ifa);
                                continue;
                        }
                        if (ifa_equal(addr, ifa->ifa_addr)) {
                                result = ifa;
                                IFA_ADDREF_LOCKED(ifa); /* for caller */
                                IFA_UNLOCK(ifa);
                                break;
                        }
                        if ((ifp->if_flags & IFF_BROADCAST) &&
                            ifa->ifa_broadaddr != NULL &&
                            /* IP6 doesn't have broadcast */
                            ifa->ifa_broadaddr->sa_len != 0 &&
                            ifa_equal(ifa->ifa_broadaddr, addr)) {
                                result = ifa;
                                IFA_ADDREF_LOCKED(ifa); /* for caller */
                                IFA_UNLOCK(ifa);
                                break;
                        }
                        IFA_UNLOCK(ifa);
                }
                ifnet_lock_done(ifp);
        }

        return (result);
}

struct ifaddr *
ifa_ifwithaddr(const struct sockaddr *addr)
{
        struct ifaddr *result = NULL;

        ifnet_head_lock_shared();

        result = ifa_ifwithaddr_locked(addr);

        ifnet_head_done();

        return (result);
}
/*
 * Locate the point to point interface with a given destination address.
 */
/*ARGSUSED*/
struct ifaddr *
ifa_ifwithdstaddr(const struct sockaddr *addr)
{
        struct ifnet *ifp;
        struct ifaddr *ifa;
        struct ifaddr *result = NULL;

        ifnet_head_lock_shared();
        for (ifp = ifnet_head.tqh_first; ifp && !result;
            ifp = ifp->if_link.tqe_next) {
            if ((ifp->if_flags & IFF_POINTOPOINT)) {
                        ifnet_lock_shared(ifp);
                        for (ifa = ifp->if_addrhead.tqh_first; ifa;
                            ifa = ifa->ifa_link.tqe_next) {
                                IFA_LOCK_SPIN(ifa);
                                if (ifa->ifa_addr->sa_family !=
                                    addr->sa_family) {
                                        IFA_UNLOCK(ifa);
                                        continue;
                                }
                                if (ifa_equal(addr, ifa->ifa_dstaddr)) {
                                        result = ifa;
                                        IFA_ADDREF_LOCKED(ifa); /* for caller */
                                        IFA_UNLOCK(ifa);
                                        break;
                                }
                                IFA_UNLOCK(ifa);
                        }
                        ifnet_lock_done(ifp);
                }
        }
        ifnet_head_done();
        return (result);
}

/*
 * Locate the source address of an interface based on a complete address.
 */
struct ifaddr *
ifa_ifwithaddr_scoped_locked(const struct sockaddr *addr, unsigned int ifscope)
{
        struct ifaddr *result = NULL;
        struct ifnet *ifp;

        if (ifscope == IFSCOPE_NONE)
                return (ifa_ifwithaddr_locked(addr));

        if (ifscope > (unsigned int)if_index) {
                return (NULL);
        }

        ifp = ifindex2ifnet[ifscope];
        if (ifp != NULL) {
                struct ifaddr *ifa = NULL;

                /*
                 * This is suboptimal; there should be a better way
                 * to search for a given address of an interface
                 * for any given address family.
                 */
                ifnet_lock_shared(ifp);
                for (ifa = ifp->if_addrhead.tqh_first; ifa != NULL;
                    ifa = ifa->ifa_link.tqe_next) {
                        IFA_LOCK_SPIN(ifa);
                        if (ifa->ifa_addr->sa_family != addr->sa_family) {
                                IFA_UNLOCK(ifa);
                                continue;
                        }
                        if (ifa_equal(addr, ifa->ifa_addr)) {
                                result = ifa;
                                IFA_ADDREF_LOCKED(ifa); /* for caller */
                                IFA_UNLOCK(ifa);
                                break;
                        }
                        if ((ifp->if_flags & IFF_BROADCAST) &&
                            ifa->ifa_broadaddr != NULL &&
                            /* IP6 doesn't have broadcast */
                            ifa->ifa_broadaddr->sa_len != 0 &&
                            ifa_equal(ifa->ifa_broadaddr, addr)) {
                                result = ifa;
                                IFA_ADDREF_LOCKED(ifa); /* for caller */
                                IFA_UNLOCK(ifa);
                                break;
                        }
                        IFA_UNLOCK(ifa);
                }
                ifnet_lock_done(ifp);
        }

        return (result);
}

struct ifaddr *
ifa_ifwithaddr_scoped(const struct sockaddr *addr, unsigned int ifscope)
{
        struct ifaddr *result = NULL;

        ifnet_head_lock_shared();

        result = ifa_ifwithaddr_scoped_locked(addr, ifscope);

        ifnet_head_done();

        return (result);
}

struct ifaddr *
ifa_ifwithnet(const struct sockaddr *addr)
{
        return (ifa_ifwithnet_common(addr, IFSCOPE_NONE));
}

struct ifaddr *
ifa_ifwithnet_scoped(const struct sockaddr *addr, unsigned int ifscope)
{
        return (ifa_ifwithnet_common(addr, ifscope));
}

/*
 * Find an interface on a specific network.  If many, choice
 * is most specific found.
 */
static struct ifaddr *
ifa_ifwithnet_common(const struct sockaddr *addr, unsigned int ifscope)
{
        struct ifnet *ifp;
        struct ifaddr *ifa = NULL;
        struct ifaddr *ifa_maybe = NULL;
        u_int af = addr->sa_family;
        const char *addr_data = addr->sa_data, *cplim;

#if INET6
        if (af != AF_INET && af != AF_INET6)
#else
        if (af != AF_INET)
#endif /* !INET6 */
                ifscope = IFSCOPE_NONE;

        ifnet_head_lock_shared();
        /*
         * AF_LINK addresses can be looked up directly by their index number,
         * so do that if we can.
         */
        if (af == AF_LINK) {
                const struct sockaddr_dl *sdl =
                    (const struct sockaddr_dl *)(uintptr_t)(size_t)addr;
                if (sdl->sdl_index && sdl->sdl_index <= if_index) {
                        ifa = ifnet_addrs[sdl->sdl_index - 1];
                        if (ifa != NULL)
                                IFA_ADDREF(ifa);

                        ifnet_head_done();
                        return (ifa);
                }
        }

        /*
         * Scan though each interface, looking for ones that have
         * addresses in this address family.
         */
        for (ifp = ifnet_head.tqh_first; ifp; ifp = ifp->if_link.tqe_next) {
                ifnet_lock_shared(ifp);
                for (ifa = ifp->if_addrhead.tqh_first; ifa;
                     ifa = ifa->ifa_link.tqe_next) {
                        const char *cp, *cp2, *cp3;

                        IFA_LOCK(ifa);
                        if (ifa->ifa_addr == NULL ||
                            ifa->ifa_addr->sa_family != af) {
next:
                                IFA_UNLOCK(ifa);
                                continue;
                        }
                        /*
                         * If we're looking up with a scope,
                         * find using a matching interface.
                         */
                        if (ifscope != IFSCOPE_NONE &&
                            ifp->if_index != ifscope) {
                                IFA_UNLOCK(ifa);
                                continue;
                        }

                        /*
                         * Scan all the bits in the ifa's address.
                         * If a bit dissagrees with what we are
                         * looking for, mask it with the netmask
                         * to see if it really matters.
                         * (A byte at a time)
                         */
                        if (ifa->ifa_netmask == 0) {
                                IFA_UNLOCK(ifa);
                                continue;
                        }
                        cp = addr_data;
                        cp2 = ifa->ifa_addr->sa_data;
                        cp3 = ifa->ifa_netmask->sa_data;
                        cplim = ifa->ifa_netmask->sa_len +
                            (char *)ifa->ifa_netmask;
                        while (cp3 < cplim)
                                if ((*cp++ ^ *cp2++) & *cp3++)
                                        goto next; /* next address! */
                        /*
                         * If the netmask of what we just found
                         * is more specific than what we had before
                         * (if we had one) then remember the new one
                         * before continuing to search
                         * for an even better one.
                         */
                        if (ifa_maybe == NULL ||
                            rn_refines((caddr_t)ifa->ifa_netmask,
                            (caddr_t)ifa_maybe->ifa_netmask)) {
                                IFA_ADDREF_LOCKED(ifa); /* ifa_maybe */
                                IFA_UNLOCK(ifa);
                                if (ifa_maybe != NULL)
                                        IFA_REMREF(ifa_maybe);
                                ifa_maybe = ifa;
                        } else {
                                IFA_UNLOCK(ifa);
                        }
                        IFA_LOCK_ASSERT_NOTHELD(ifa);
                }
                ifnet_lock_done(ifp);

                if (ifa != NULL)
                        break;
        }
        ifnet_head_done();

        if (ifa == NULL)
                ifa = ifa_maybe;
        else if (ifa_maybe != NULL)
                IFA_REMREF(ifa_maybe);

        return (ifa);
}

/*
 * Find an interface address specific to an interface best matching
 * a given address.
 */
struct ifaddr *
ifaof_ifpforaddr(const struct sockaddr *addr, struct ifnet *ifp)
{
        struct ifaddr *ifa = NULL;
        const char *cp, *cp2, *cp3;
        char *cplim;
        struct ifaddr *ifa_maybe = NULL;
        struct ifaddr *better_ifa_maybe = NULL;
        u_int af = addr->sa_family;

        if (af >= AF_MAX)
                return (NULL);

        ifnet_lock_shared(ifp);
        for (ifa = ifp->if_addrhead.tqh_first; ifa;
             ifa = ifa->ifa_link.tqe_next) {
                IFA_LOCK(ifa);
                if (ifa->ifa_addr->sa_family != af) {
                        IFA_UNLOCK(ifa);
                        continue;
                }
                if (ifa_maybe == NULL) {
                        IFA_ADDREF_LOCKED(ifa); /* for ifa_maybe */
                        ifa_maybe = ifa;
                }
                if (ifa->ifa_netmask == 0) {
                        if (ifa_equal(addr, ifa->ifa_addr) ||
                            ifa_equal(addr, ifa->ifa_dstaddr)) {
                                IFA_ADDREF_LOCKED(ifa); /* for caller */
                                IFA_UNLOCK(ifa);
                                break;
                        }
                        IFA_UNLOCK(ifa);
                        continue;
                }
                if (ifp->if_flags & IFF_POINTOPOINT) {
                        if (ifa_equal(addr, ifa->ifa_dstaddr)) {
                                IFA_ADDREF_LOCKED(ifa); /* for caller */
                                IFA_UNLOCK(ifa);
                                break;
                        }
                } else {
                        if (ifa_equal(addr, ifa->ifa_addr)) {
                                /* exact match */
                                IFA_ADDREF_LOCKED(ifa); /* for caller */
                                IFA_UNLOCK(ifa);
                                break;
                        }
                        cp = addr->sa_data;
                        cp2 = ifa->ifa_addr->sa_data;
                        cp3 = ifa->ifa_netmask->sa_data;
                        cplim = ifa->ifa_netmask->sa_len +
                            (char *)ifa->ifa_netmask;
                        for (; cp3 < cplim; cp3++)
                                if ((*cp++ ^ *cp2++) & *cp3)
                                        break;
                        if (cp3 == cplim) {
                                /* subnet match */
                                if (better_ifa_maybe == NULL) {
                                        /* for better_ifa_maybe */
                                        IFA_ADDREF_LOCKED(ifa);
                                        better_ifa_maybe = ifa;
                                }
                        }
                }
                IFA_UNLOCK(ifa);
        }

        if (ifa == NULL) {
                if (better_ifa_maybe != NULL) {
                        ifa = better_ifa_maybe;
                        better_ifa_maybe = NULL;
                } else {
                        ifa = ifa_maybe;
                        ifa_maybe = NULL;
                }
        }

        ifnet_lock_done(ifp);

        if (better_ifa_maybe != NULL)
                IFA_REMREF(better_ifa_maybe);
        if (ifa_maybe != NULL)
                IFA_REMREF(ifa_maybe);

        return (ifa);
}

#include <net/route.h>

/*
 * Default action when installing a route with a Link Level gateway.
 * Lookup an appropriate real ifa to point to.
 * This should be moved to /sys/net/link.c eventually.
 */
void
link_rtrequest(int cmd, struct rtentry *rt, struct sockaddr *sa)
{
        struct ifaddr *ifa;
        struct sockaddr *dst;
        struct ifnet *ifp;
        void (*ifa_rtrequest)(int, struct rtentry *, struct sockaddr *);

        LCK_MTX_ASSERT(rnh_lock, LCK_MTX_ASSERT_OWNED);
        RT_LOCK_ASSERT_HELD(rt);

        if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
            ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
                return;

        /* Become a regular mutex, just in case */
        RT_CONVERT_LOCK(rt);

        ifa = ifaof_ifpforaddr(dst, ifp);
        if (ifa) {
                rtsetifa(rt, ifa);
                IFA_LOCK_SPIN(ifa);
                ifa_rtrequest = ifa->ifa_rtrequest;
                IFA_UNLOCK(ifa);
                if (ifa_rtrequest != NULL && ifa_rtrequest != link_rtrequest)
                        ifa_rtrequest(cmd, rt, sa);
                IFA_REMREF(ifa);
        }
}

/*
 * if_updown will set the interface up or down. It will
 * prevent other up/down events from occurring until this
 * up/down event has completed.
 *
 * Caller must lock ifnet. This function will drop the
 * lock. This allows ifnet_set_flags to set the rest of
 * the flags after we change the up/down state without
 * dropping the interface lock between setting the
 * up/down state and updating the rest of the flags.
 */
__private_extern__ void
if_updown( struct ifnet *ifp, int up)
{
        int i;
        struct ifaddr **ifa;
        struct timespec tv;
        struct ifclassq *ifq = &ifp->if_snd;

        /* Wait until no one else is changing the up/down state */
        while ((ifp->if_eflags & IFEF_UPDOWNCHANGE) != 0) {
                tv.tv_sec = 0;
                tv.tv_nsec = NSEC_PER_SEC / 10;
                ifnet_lock_done(ifp);
                msleep(&ifp->if_eflags, NULL, 0, "if_updown", &tv);
                ifnet_lock_exclusive(ifp);
        }

        /* Verify that the interface isn't already in the right state */
        if ((!up && (ifp->if_flags & IFF_UP) == 0) ||
                (up && (ifp->if_flags & IFF_UP) == IFF_UP)) {
                return;
        }

        /* Indicate that the up/down state is changing */
        ifp->if_eflags |= IFEF_UPDOWNCHANGE;

        /* Mark interface up or down */
        if (up) {
                ifp->if_flags |= IFF_UP;
        } else {
                ifp->if_flags &= ~IFF_UP;
        }

        ifnet_touch_lastchange(ifp);

        /* Drop the lock to notify addresses and route */
        ifnet_lock_done(ifp);

        IFCQ_LOCK(ifq);
        if_qflush(ifp, 1);

        /* Inform all transmit queues about the new link state */
        ifnet_update_sndq(ifq, up ? CLASSQ_EV_LINK_UP : CLASSQ_EV_LINK_DOWN);
        IFCQ_UNLOCK(ifq);

        if (ifnet_get_address_list(ifp, &ifa) == 0) {
                for (i = 0; ifa[i] != 0; i++) {
                        pfctlinput(up ? PRC_IFUP : PRC_IFDOWN, ifa[i]->ifa_addr);
                }
                ifnet_free_address_list(ifa);
        }
        rt_ifmsg(ifp);

        /* Aquire the lock to clear the changing flag */
        ifnet_lock_exclusive(ifp);
        ifp->if_eflags &= ~IFEF_UPDOWNCHANGE;
        wakeup(&ifp->if_eflags);
}

/*
 * Mark an interface down and notify protocols of
 * the transition.
 */
void
if_down(
        struct ifnet *ifp)
{
        ifnet_lock_exclusive(ifp);
        if_updown(ifp, 0);
        ifnet_lock_done(ifp);
}

/*
 * Mark an interface up and notify protocols of
 * the transition.
 */
void
if_up(
        struct ifnet *ifp)
{
        ifnet_lock_exclusive(ifp);
        if_updown(ifp, 1);
        ifnet_lock_done(ifp);
}

/*
 * Flush an interface queue.
 */
void
if_qflush(struct ifnet *ifp, int ifq_locked)
{
        struct ifclassq *ifq = &ifp->if_snd;

        if (!ifq_locked)
                IFCQ_LOCK(ifq);

        if (IFCQ_IS_ENABLED(ifq))
                IFCQ_PURGE(ifq);

        VERIFY(IFCQ_IS_EMPTY(ifq));

        if (!ifq_locked)
                IFCQ_UNLOCK(ifq);
}

void
if_qflush_sc(struct ifnet *ifp, mbuf_svc_class_t sc, u_int32_t flow,
    u_int32_t *packets, u_int32_t *bytes, int ifq_locked)
{
        struct ifclassq *ifq = &ifp->if_snd;
        u_int32_t cnt = 0, len = 0;
        u_int32_t a_cnt = 0, a_len = 0;

        VERIFY(sc == MBUF_SC_UNSPEC || MBUF_VALID_SC(sc));
        VERIFY(flow != 0);

        if (!ifq_locked)
                IFCQ_LOCK(ifq);

        if (IFCQ_IS_ENABLED(ifq))
                IFCQ_PURGE_SC(ifq, sc, flow, cnt, len);

        if (!ifq_locked)
                IFCQ_UNLOCK(ifq);

        if (packets != NULL)
                *packets = cnt + a_cnt;
        if (bytes != NULL)
                *bytes = len + a_len;
}

/*
 * Extracts interface unit number and name from string, returns -1 upon failure.
 * Upon success, returns extracted unit number, and interface name in dst.
 */
int
ifunit_extract(const char *src, char *dst, size_t dstlen, int *unit)
{
        const char *cp;
        size_t len, m;
        char c;
        int u;

        if (src == NULL || dst == NULL || dstlen == 0 || unit == NULL)
                return (-1);

        len = strlen(src);
        if (len < 2 || len > dstlen)
                return (-1);
        cp = src + len - 1;
        c = *cp;
        if (c < '0' || c > '9')
                return (-1);            /* trailing garbage */
        u = 0;
        m = 1;
        do {
                if (cp == src)
                        return (-1);    /* no interface name */
                u += (c - '0') * m;
                if (u > 1000000)
                        return (-1);    /* number is unreasonable */
                m *= 10;
                c = *--cp;
        } while (c >= '0' && c <= '9');
        len = cp - src + 1;
        bcopy(src, dst, len);
        dst[len] = '\0';
        *unit = u;

        return (0);
}

/*
 * Map interface name to
 * interface structure pointer.
 */
static struct ifnet *
ifunit_common(const char *name, boolean_t hold)
{
        char namebuf[IFNAMSIZ + 1];
        struct ifnet *ifp;
        int unit;

        if (ifunit_extract(name, namebuf, sizeof (namebuf), &unit) < 0)
                return (NULL);

        /* for safety, since we use strcmp() below */
        namebuf[sizeof (namebuf) - 1] = '\0';

        /*
         * Now search all the interfaces for this name/number
         */
        ifnet_head_lock_shared();
        TAILQ_FOREACH(ifp, &ifnet_head, if_link) {
                /*
                 * Use strcmp() rather than strncmp() here,
                 * since we want to match the entire string.
                 */
                if (strcmp(ifp->if_name, namebuf))
                        continue;
                if (unit == ifp->if_unit)
                        break;
        }

        /* if called from ifunit_ref() and ifnet is not attached, bail */
        if (hold && ifp != NULL && !ifnet_is_attached(ifp, 1))
                ifp = NULL;

        ifnet_head_done();
        return (ifp);
}

struct ifnet *
ifunit(const char *name)
{
        return (ifunit_common(name, FALSE));
}

/*
 * Similar to ifunit(), except that we hold an I/O reference count on an
 * attached interface, which must later be released via ifnet_decr_iorefcnt().
 * Will return NULL unless interface exists and is fully attached.
 */
struct ifnet *
ifunit_ref(const char *name)
{
        return (ifunit_common(name, TRUE));
}

/*
 * Map interface name in a sockaddr_dl to
 * interface structure pointer.
 */
struct ifnet *
if_withname(struct sockaddr *sa)
{
        char ifname[IFNAMSIZ+1];
        struct sockaddr_dl *sdl = (struct sockaddr_dl *)(void *)sa;

        if ((sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) ||
            (sdl->sdl_nlen > IFNAMSIZ))
                return (NULL);

        /*
         * ifunit wants a null-terminated name.  It may not be null-terminated
         * in the sockaddr.  We don't want to change the caller's sockaddr,
         * and there might not be room to put the trailing null anyway, so we
         * make a local copy that we know we can null terminate safely.
         */

        bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen);
        ifname[sdl->sdl_nlen] = '\0';
        return (ifunit(ifname));
}

static __attribute__((noinline)) int
ifioctl_ifconf(u_long cmd, caddr_t data)
{
        int error = 0;

        switch (cmd) {
        case OSIOCGIFCONF32:                    /* struct ifconf32 */
        case SIOCGIFCONF32: {                   /* struct ifconf32 */
                struct ifconf32 ifc;
                bcopy(data, &ifc, sizeof (ifc));
                error = ifconf(cmd, CAST_USER_ADDR_T(ifc.ifc_req),
                    &ifc.ifc_len);
                bcopy(&ifc, data, sizeof (ifc));
                break;
        }

        case SIOCGIFCONF64:                     /* struct ifconf64 */
        case OSIOCGIFCONF64: {                  /* struct ifconf64 */
                struct ifconf64 ifc;
                bcopy(data, &ifc, sizeof (ifc));
                error = ifconf(cmd, ifc.ifc_req, &ifc.ifc_len);
                bcopy(&ifc, data, sizeof (ifc));
                break;
        }

        default:
                VERIFY(0);
                /* NOTREACHED */
        }

        return (error);
}

static __attribute__((noinline)) int
ifioctl_ifclone(u_long cmd, caddr_t data)
{
        int error = 0;

        switch (cmd) {
        case SIOCIFGCLONERS32: {                /* struct if_clonereq32 */
                struct if_clonereq32 ifcr;
                bcopy(data, &ifcr, sizeof (ifcr));
                error = if_clone_list(ifcr.ifcr_count, &ifcr.ifcr_total,
                    CAST_USER_ADDR_T(ifcr.ifcru_buffer));
                bcopy(&ifcr, data, sizeof (ifcr));
                break;
        }

        case SIOCIFGCLONERS64: {                /* struct if_clonereq64 */
                struct if_clonereq64 ifcr;
                bcopy(data, &ifcr, sizeof (ifcr));
                error = if_clone_list(ifcr.ifcr_count, &ifcr.ifcr_total,
                    ifcr.ifcru_buffer);
                bcopy(&ifcr, data, sizeof (ifcr));
                break;
        }

        default:
                VERIFY(0);
                /* NOTREACHED */
        }

        return (error);
}

static __attribute__((noinline)) int
ifioctl_ifdesc(struct ifnet *ifp, u_long cmd, caddr_t data, struct proc *p)
{
        struct if_descreq *ifdr = (struct if_descreq *)(void *)data;
        u_int32_t ifdr_len;
        int error = 0;

        VERIFY(ifp != NULL);

        switch (cmd) {
        case SIOCSIFDESC: {                     /* struct if_descreq */
                if ((error = proc_suser(p)) != 0)
                        break;

                ifnet_lock_exclusive(ifp);
                bcopy(&ifdr->ifdr_len, &ifdr_len, sizeof (ifdr_len));
                if (ifdr_len > sizeof (ifdr->ifdr_desc) ||
                    ifdr_len > ifp->if_desc.ifd_maxlen) {
                        error = EINVAL;
                        ifnet_lock_done(ifp);
                        break;
                }

                bzero(ifp->if_desc.ifd_desc, ifp->if_desc.ifd_maxlen);
                if ((ifp->if_desc.ifd_len = ifdr_len) > 0) {
                        bcopy(ifdr->ifdr_desc, ifp->if_desc.ifd_desc,
                            MIN(ifdr_len, ifp->if_desc.ifd_maxlen));
                }
                ifnet_lock_done(ifp);
                break;
        }

        case SIOCGIFDESC: {                     /* struct if_descreq */
                ifnet_lock_shared(ifp);
                ifdr_len = MIN(ifp->if_desc.ifd_len, sizeof (ifdr->ifdr_desc));
                bcopy(&ifdr_len, &ifdr->ifdr_len, sizeof (ifdr_len));
                bzero(&ifdr->ifdr_desc, sizeof (ifdr->ifdr_desc));
                if (ifdr_len > 0) {
                        bcopy(ifp->if_desc.ifd_desc, ifdr->ifdr_desc, ifdr_len);
                }
                ifnet_lock_done(ifp);
                break;
        }

        default:
                VERIFY(0);
                /* NOTREACHED */
        }

        return (error);
}

static __attribute__((noinline)) int
ifioctl_linkparams(struct ifnet *ifp, u_long cmd, caddr_t data, struct proc *p)
{
        struct if_linkparamsreq *iflpr =
            (struct if_linkparamsreq *)(void *)data;
        struct ifclassq *ifq;
        int error = 0;

        VERIFY(ifp != NULL);
        ifq = &ifp->if_snd;

        switch (cmd) {
        case SIOCSIFLINKPARAMS: {               /* struct if_linkparamsreq */
                struct tb_profile tb = { 0, 0, 0 };

                if ((error = proc_suser(p)) != 0)
                break;

                IFCQ_LOCK(ifq);
                if (!IFCQ_IS_READY(ifq)) {
                        error = ENXIO;
                        IFCQ_UNLOCK(ifq);
                        break;
                }
                bcopy(&iflpr->iflpr_output_tbr_rate, &tb.rate,
                    sizeof (tb.rate));
                bcopy(&iflpr->iflpr_output_tbr_percent, &tb.percent,
                    sizeof (tb.percent));
                error = ifclassq_tbr_set(ifq, &tb, TRUE);
                IFCQ_UNLOCK(ifq);
                break;
        }

        case SIOCGIFLINKPARAMS: {               /* struct if_linkparamsreq */
                u_int32_t sched_type = PKTSCHEDT_NONE, flags = 0;
                u_int64_t tbr_bw = 0, tbr_pct = 0;

                IFCQ_LOCK(ifq);

                if (IFCQ_IS_ENABLED(ifq))
                        sched_type = ifq->ifcq_type;

                bcopy(&sched_type, &iflpr->iflpr_output_sched,
                    sizeof (iflpr->iflpr_output_sched));

                if (IFCQ_TBR_IS_ENABLED(ifq)) {
                        tbr_bw = ifq->ifcq_tbr.tbr_rate_raw;
                        tbr_pct = ifq->ifcq_tbr.tbr_percent;
                }
                bcopy(&tbr_bw, &iflpr->iflpr_output_tbr_rate,
                    sizeof (iflpr->iflpr_output_tbr_rate));
                bcopy(&tbr_pct, &iflpr->iflpr_output_tbr_percent,
                    sizeof (iflpr->iflpr_output_tbr_percent));
                IFCQ_UNLOCK(ifq);

                if (ifp->if_output_sched_model ==
                    IFNET_SCHED_MODEL_DRIVER_MANAGED)
                        flags |= IFLPRF_DRVMANAGED;
                bcopy(&flags, &iflpr->iflpr_flags, sizeof (iflpr->iflpr_flags));
                bcopy(&ifp->if_output_bw, &iflpr->iflpr_output_bw,
                    sizeof (iflpr->iflpr_output_bw));
                bcopy(&ifp->if_input_bw, &iflpr->iflpr_input_bw,
                    sizeof (iflpr->iflpr_input_bw));
                bcopy(&ifp->if_output_lt, &iflpr->iflpr_output_lt,
                    sizeof (iflpr->iflpr_output_lt));
                bcopy(&ifp->if_input_lt, &iflpr->iflpr_input_lt,
                    sizeof (iflpr->iflpr_input_lt));
                break;
        }

        default:
                VERIFY(0);
                /* NOTREACHED */
        }

        return (error);
}

static __attribute__((noinline)) int
ifioctl_qstats(struct ifnet *ifp, u_long cmd, caddr_t data)
{
        struct if_qstatsreq *ifqr = (struct if_qstatsreq *)(void *)data;
        u_int32_t ifqr_len, ifqr_slot;
        int error = 0;

        VERIFY(ifp != NULL);

        switch (cmd) {
        case SIOCGIFQUEUESTATS: {               /* struct if_qstatsreq */
                bcopy(&ifqr->ifqr_slot, &ifqr_slot, sizeof (ifqr_slot));
                bcopy(&ifqr->ifqr_len, &ifqr_len, sizeof (ifqr_len));
                error = ifclassq_getqstats(&ifp->if_snd, ifqr_slot,
                    ifqr->ifqr_buf, &ifqr_len);
                if (error != 0)
                        ifqr_len = 0;
                bcopy(&ifqr_len, &ifqr->ifqr_len, sizeof (ifqr_len));
                break;
        }

        default:
                VERIFY(0);
                /* NOTREACHED */
        }

        return (error);
}

static __attribute__((noinline)) int
ifioctl_throttle(struct ifnet *ifp, u_long cmd, caddr_t data, struct proc *p)
{
        struct if_throttlereq *ifthr = (struct if_throttlereq *)(void *)data;
        u_int32_t ifthr_level;
        int error = 0;

        VERIFY(ifp != NULL);

        switch (cmd) {
        case SIOCSIFTHROTTLE: {                 /* struct if_throttlereq */
                /*
                 * XXX: Use priv_check_cred() instead of root check?
                 */
                if ((error = proc_suser(p)) != 0)
                        break;

                bcopy(&ifthr->ifthr_level, &ifthr_level, sizeof (ifthr_level));
                error = ifnet_set_throttle(ifp, ifthr_level);
                if (error == EALREADY)
                        error = 0;
                break;
        }

        case SIOCGIFTHROTTLE: {                 /* struct if_throttlereq */
                if ((error = ifnet_get_throttle(ifp, &ifthr_level)) == 0) {
                        bcopy(&ifthr_level, &ifthr->ifthr_level,
                            sizeof (ifthr_level));
                }
                break;
        }

        default:
                VERIFY(0);
                /* NOTREACHED */
        }

        return (error);
}

static int
ifioctl_getnetagents(struct ifnet *ifp, u_int32_t *count, user_addr_t uuid_p)
{
        int error = 0;
        u_int32_t index = 0;
        u_int32_t valid_netagent_count = 0;
        *count = 0;

        ifnet_lock_assert(ifp, IFNET_LCK_ASSERT_SHARED);

        if (ifp->if_agentids != NULL) {
                for (index = 0; index < ifp->if_agentcount; index++) {
                        uuid_t *netagent_uuid = &(ifp->if_agentids[index]);
                        if (!uuid_is_null(*netagent_uuid)) {
                                if (uuid_p != USER_ADDR_NULL) {
                                        error = copyout(netagent_uuid,
                                                uuid_p + sizeof(uuid_t) * valid_netagent_count,
                                                sizeof(uuid_t));
                                        if (error != 0) {
                                                return (error);
                                        }
                                }
                                valid_netagent_count++;
                        }
                }
        }
        *count = valid_netagent_count;

        return (0);
}

#define IF_MAXAGENTS            64
#define IF_AGENT_INCREMENT      8
static int
if_add_netagent_locked(struct ifnet *ifp, uuid_t new_agent_uuid)
{
        uuid_t *first_empty_slot = NULL;
        u_int32_t index = 0;
        bool already_added = FALSE;

        if (ifp->if_agentids != NULL) {
                for (index = 0; index < ifp->if_agentcount; index++) {
                        uuid_t *netagent_uuid = &(ifp->if_agentids[index]);
                        if (uuid_compare(*netagent_uuid, new_agent_uuid) == 0) {
                                /* Already present, ignore */
                                already_added = TRUE;
                                break;
                        }
                        if (first_empty_slot == NULL &&
                                uuid_is_null(*netagent_uuid)) {
                                first_empty_slot = netagent_uuid;
                        }
                }
        }
        if (already_added) {
                /* Already added agent, don't return an error */
                return (0);
        }
        if (first_empty_slot == NULL) {
                if (ifp->if_agentcount >= IF_MAXAGENTS) {
                        /* No room for another netagent UUID, bail */
                        return (ENOMEM);
                } else {
                        /* Calculate new array size */
                        u_int32_t new_agent_count =
                        MIN(ifp->if_agentcount + IF_AGENT_INCREMENT,
                            IF_MAXAGENTS);

                        /* Reallocate array */
                        uuid_t *new_agent_array = _REALLOC(ifp->if_agentids,
                            sizeof(uuid_t) * new_agent_count, M_NETAGENT,
                            M_WAITOK | M_ZERO);
                        if (new_agent_array == NULL) {
                                return (ENOMEM);
                        }

                        /* Save new array */
                        ifp->if_agentids = new_agent_array;

                        /* Set first empty slot */
                        first_empty_slot =
                            &(ifp->if_agentids[ifp->if_agentcount]);

                        /* Save new array length */
                        ifp->if_agentcount = new_agent_count;
                }
        }
        uuid_copy(*first_empty_slot, new_agent_uuid);
        netagent_post_updated_interfaces(new_agent_uuid);
        return (0);
}

int
if_add_netagent(struct ifnet *ifp, uuid_t new_agent_uuid)
{
        VERIFY(ifp != NULL);

        ifnet_lock_exclusive(ifp);

        int error = if_add_netagent_locked(ifp, new_agent_uuid);

        ifnet_lock_done(ifp);

        return (error);
}

static int
if_delete_netagent_locked(struct ifnet *ifp, uuid_t remove_agent_uuid)
{
        u_int32_t index = 0;
        bool removed_agent_id = FALSE;

        if (ifp->if_agentids != NULL) {
                for (index = 0; index < ifp->if_agentcount; index++) {
                        uuid_t *netagent_uuid = &(ifp->if_agentids[index]);
                        if (uuid_compare(*netagent_uuid,
                            remove_agent_uuid) == 0) {
                                uuid_clear(*netagent_uuid);
                                removed_agent_id = TRUE;
                                break;
                        }
                }
        }
        if (removed_agent_id)
                netagent_post_updated_interfaces(remove_agent_uuid);

        return (0);
}

int
if_delete_netagent(struct ifnet *ifp, uuid_t remove_agent_uuid)
{
        VERIFY(ifp != NULL);

        ifnet_lock_exclusive(ifp);

        int error = if_delete_netagent_locked(ifp, remove_agent_uuid);

        ifnet_lock_done(ifp);

        return (error);
}

static __attribute__((noinline)) int
ifioctl_netagent(struct ifnet *ifp, u_long cmd, caddr_t data, struct proc *p)
{
        struct if_agentidreq *ifar = (struct if_agentidreq *)(void *)data;
        union {
                struct if_agentidsreq32 s32;
                struct if_agentidsreq64 s64;
        } u;
        int error = 0;

        VERIFY(ifp != NULL);

        /* Get an io ref count if the interface is attached */
        if (!ifnet_is_attached(ifp, 1)) {
                return (EOPNOTSUPP);
        }

        if (cmd == SIOCAIFAGENTID ||
                cmd == SIOCDIFAGENTID) {
                ifnet_lock_exclusive(ifp);
        } else {
                ifnet_lock_shared(ifp);
        }

        switch (cmd) {
                case SIOCAIFAGENTID: {          /* struct if_agentidreq */
                        // TODO: Use priv_check_cred() instead of root check
                        if ((error = proc_suser(p)) != 0) {
                                break;
                        }
                        error = if_add_netagent_locked(ifp, ifar->ifar_uuid);
                        break;
                }
                case SIOCDIFAGENTID: {                  /* struct if_agentidreq */
                        // TODO: Use priv_check_cred() instead of root check
                        if ((error = proc_suser(p)) != 0) {
                                break;
                        }
                        error = if_delete_netagent_locked(ifp, ifar->ifar_uuid);
                        break;
                }
                case SIOCGIFAGENTIDS32: {       /* struct if_agentidsreq32 */
                        bcopy(data, &u.s32, sizeof(u.s32));
                        error = ifioctl_getnetagents(ifp, &u.s32.ifar_count,
                            u.s32.ifar_uuids);
                        if (error == 0) {
                                bcopy(&u.s32, data, sizeof(u.s32));
                        }
                        break;
                }
                case SIOCGIFAGENTIDS64: {       /* struct if_agentidsreq64 */
                        bcopy(data, &u.s64, sizeof(u.s64));
                        error = ifioctl_getnetagents(ifp, &u.s64.ifar_count,
                            u.s64.ifar_uuids);
                        if (error == 0) {
                                bcopy(&u.s64, data, sizeof(u.s64));
                        }
                        break;
                }
                default:
                        VERIFY(0);
                        /* NOTREACHED */
        }

        ifnet_lock_done(ifp);
        ifnet_decr_iorefcnt(ifp);

        return (error);
}

void
ifnet_clear_netagent(uuid_t netagent_uuid)
{
        struct ifnet *ifp = NULL;
        u_int32_t index = 0;

        ifnet_head_lock_shared();

        TAILQ_FOREACH(ifp, &ifnet_head, if_link) {
                ifnet_lock_shared(ifp);
                if (ifp->if_agentids != NULL) {
                        for (index = 0; index < ifp->if_agentcount; index++) {
                                uuid_t *ifp_netagent_uuid = &(ifp->if_agentids[index]);
                                if (uuid_compare(*ifp_netagent_uuid, netagent_uuid) == 0) {
                                        uuid_clear(*ifp_netagent_uuid);
                                }
                        }
                }
                ifnet_lock_done(ifp);
        }

        ifnet_head_done();
}

void
ifnet_increment_generation(ifnet_t interface)
{
        OSIncrementAtomic(&interface->if_generation);
}

u_int32_t
ifnet_get_generation(ifnet_t interface)
{
        return (interface->if_generation);
}

void
ifnet_remove_from_ordered_list(struct ifnet *ifp)
{
        ifnet_head_assert_exclusive();

        // Remove from list
        TAILQ_REMOVE(&ifnet_ordered_head, ifp, if_ordered_link);
        ifp->if_ordered_link.tqe_next = NULL;
        ifp->if_ordered_link.tqe_prev = NULL;

        // Update ordered count
        VERIFY(if_ordered_count > 0);
        if_ordered_count--;
}

static int
ifnet_reset_order(u_int32_t *ordered_indices, u_int32_t count)
{
        struct ifnet *ifp = NULL;
        int error = 0;

        ifnet_head_lock_exclusive();
        for (u_int32_t order_index = 0; order_index < count; order_index++) {
                if (ordered_indices[order_index] == IFSCOPE_NONE ||
                    ordered_indices[order_index] > (uint32_t)if_index) {
                        error = EINVAL;
                        ifnet_head_done();
                        return (error);
                }
        }
        // Flush current ordered list
        for (ifp = TAILQ_FIRST(&ifnet_ordered_head); ifp != NULL;
            ifp = TAILQ_FIRST(&ifnet_ordered_head)) {
                ifnet_lock_exclusive(ifp);
                ifnet_remove_from_ordered_list(ifp);
                ifnet_lock_done(ifp);
        }

        VERIFY(if_ordered_count == 0);

        for (u_int32_t order_index = 0; order_index < count; order_index++) {
                u_int32_t interface_index = ordered_indices[order_index];
                ifp = ifindex2ifnet[interface_index];
                if (ifp == NULL) {
                        continue;
                }
                ifnet_lock_exclusive(ifp);
                TAILQ_INSERT_TAIL(&ifnet_ordered_head, ifp, if_ordered_link);
                ifnet_lock_done(ifp);
                if_ordered_count++;
        }

        ifnet_head_done();

        necp_update_all_clients();

        return (error);
}

int
if_set_qosmarking_mode(struct ifnet *ifp, u_int32_t mode)
{
        int error = 0;
        u_int32_t old_mode = ifp->if_qosmarking_mode;

        switch (mode) {
                case IFRTYPE_QOSMARKING_MODE_NONE:
                        ifp->if_qosmarking_mode = IFRTYPE_QOSMARKING_MODE_NONE;
                        ifp->if_eflags &= ~IFEF_QOSMARKING_CAPABLE;
                        break;
                case IFRTYPE_QOSMARKING_FASTLANE:
                        ifp->if_qosmarking_mode = IFRTYPE_QOSMARKING_FASTLANE;
                        ifp->if_eflags |= IFEF_QOSMARKING_CAPABLE;
                        if (net_qos_policy_capable_enabled != 0)
                                ifp->if_eflags |= IFEF_QOSMARKING_ENABLED;
                        break;
                default:
                        error = EINVAL;
                        break;
        }
        if (error == 0 && old_mode != ifp->if_qosmarking_mode) {
                dlil_post_msg(ifp, KEV_DL_SUBCLASS, KEV_DL_QOS_MODE_CHANGED,
                    NULL, sizeof(struct kev_dl_rrc_state));

        }
        return (error);
}

static __attribute__((noinline)) int
ifioctl_iforder(u_long cmd, caddr_t data)
{
        int error = 0;
        u_int32_t *ordered_indices = NULL;
        if (data == NULL) {
                return (EINVAL);
        }

        switch (cmd) {
        case SIOCSIFORDER: {            /* struct if_order */
                struct if_order *ifo = (struct if_order *)(void *)data;

                if (ifo->ifo_count == 0 || ifo->ifo_count > (u_int32_t)if_index) {
                        error = EINVAL;
                        break;
                }

                size_t length = (ifo->ifo_count * sizeof(u_int32_t));
                if (length > 0) {
                        if (ifo->ifo_ordered_indices == USER_ADDR_NULL) {
                                error = EINVAL;
                                break;
                        }
                        ordered_indices = _MALLOC(length, M_NECP, M_WAITOK);
                        if (ordered_indices == NULL) {
                                error = ENOMEM;
                                break;
                        }

                        error = copyin(ifo->ifo_ordered_indices,
                            ordered_indices, length);
                        if (error != 0) {
                                break;
                        }
                }
                /* ordered_indices should not contain duplicates */
                bool found_duplicate = FALSE;
                for (uint32_t i = 0; i < (ifo->ifo_count - 1) && !found_duplicate ; i++){
                        for (uint32_t j = i + 1; j < ifo->ifo_count && !found_duplicate ; j++){
                                if (ordered_indices[j] == ordered_indices[i]){
                                        error = EINVAL;
                                        found_duplicate = TRUE;
                                        break;
                                }
                        }
                }
                if (found_duplicate)
                        break;

                error = ifnet_reset_order(ordered_indices, ifo->ifo_count);

                break;
        }

        case SIOCGIFORDER: {            /* struct if_order */
                struct if_order *ifo = (struct if_order *)(void *)data;
                u_int32_t ordered_count = *((volatile u_int32_t *)&if_ordered_count);

                if (ifo->ifo_count == 0 ||
                        ordered_count == 0) {
                        ifo->ifo_count = 0;
                } else if (ifo->ifo_ordered_indices != USER_ADDR_NULL) {
                        u_int32_t count_to_copy =
                            MIN(ordered_count, ifo->ifo_count);
                        size_t length = (count_to_copy * sizeof(u_int32_t));
                        struct ifnet *ifp = NULL;
                        u_int32_t cursor = 0;

                        ordered_indices = _MALLOC(length, M_NECP, M_WAITOK | M_ZERO);
                        if (ordered_indices == NULL) {
                                error = ENOMEM;
                                break;
                        }

                        ifnet_head_lock_shared();
                        TAILQ_FOREACH(ifp, &ifnet_ordered_head, if_ordered_link) {
                                if (cursor >= count_to_copy ||
                                    cursor >= if_ordered_count) {
                                        break;
                                }
                                ordered_indices[cursor] = ifp->if_index;
                                cursor++;
                        }
                        ifnet_head_done();

                        /* We might have parsed less than the original length
                         * because the list could have changed.
                         */
                        length = cursor * sizeof(u_int32_t);
                        ifo->ifo_count = cursor;
                        error = copyout(ordered_indices,
                            ifo->ifo_ordered_indices, length);
                } else {
                        error = EINVAL;
                }
                break;
        }

        default: {
                VERIFY(0);
                /* NOTREACHED */
        }
        }

        if (ordered_indices != NULL) {
                _FREE(ordered_indices, M_NECP);
        }

        return (error);
}

static __attribute__((noinline)) int
ifioctl_netsignature(struct ifnet *ifp, u_long cmd, caddr_t data)
{
        struct if_nsreq *ifnsr = (struct if_nsreq *)(void *)data;
        u_int16_t flags;
        int error = 0;

        VERIFY(ifp != NULL);

        switch (cmd) {
        case SIOCSIFNETSIGNATURE:               /* struct if_nsreq */
                if (ifnsr->ifnsr_len > sizeof (ifnsr->ifnsr_data)) {
                        error = EINVAL;
                        break;
                }
                bcopy(&ifnsr->ifnsr_flags, &flags, sizeof (flags));
                error = ifnet_set_netsignature(ifp, ifnsr->ifnsr_family,
                    ifnsr->ifnsr_len, flags, ifnsr->ifnsr_data);
                break;

        case SIOCGIFNETSIGNATURE:               /* struct if_nsreq */
                ifnsr->ifnsr_len = sizeof (ifnsr->ifnsr_data);
                error = ifnet_get_netsignature(ifp, ifnsr->ifnsr_family,
                    &ifnsr->ifnsr_len, &flags, ifnsr->ifnsr_data);
                if (error == 0)
                        bcopy(&flags, &ifnsr->ifnsr_flags, sizeof (flags));
                else
                        ifnsr->ifnsr_len = 0;
                break;

        default:
                VERIFY(0);
                /* NOTREACHED */
        }

        return (error);
}

#if INET6
static __attribute__((noinline)) int
ifioctl_nat64prefix(struct ifnet *ifp, u_long cmd, caddr_t data)
{
        struct if_nat64req *ifnat64 = (struct if_nat64req *)(void *)data;
        int error = 0;

        VERIFY(ifp != NULL);

        switch (cmd) {
        case SIOCSIFNAT64PREFIX:                /* struct if_nat64req */
                error = ifnet_set_nat64prefix(ifp, ifnat64->ifnat64_prefixes);
                break;

        case SIOCGIFNAT64PREFIX:                /* struct if_nat64req */
                error = ifnet_get_nat64prefix(ifp, ifnat64->ifnat64_prefixes);
                break;

        default:
                VERIFY(0);
                /* NOTREACHED */
        }

        return (error);
}
#endif


/*
 * List the ioctl()s we can perform on restricted INTCOPROC interfaces.
 */
static bool
ifioctl_restrict_intcoproc(unsigned long cmd, const char *ifname,
    struct ifnet *ifp, struct proc *p)
{

        if (intcoproc_unrestricted == TRUE) {
                return (false);
        }
        if (proc_pid(p) == 0) {
                return (false);
        }
        if (ifname) {
                ifp = ifunit(ifname);
        }
        if (ifp == NULL) {
                return (false);
        }
        if (!IFNET_IS_INTCOPROC(ifp)) {
                return (false);
        }
        switch (cmd) {
        case SIOCGIFBRDADDR:
        case SIOCGIFCONF32:
        case SIOCGIFCONF64:
        case SIOCGIFFLAGS:
        case SIOCGIFEFLAGS:
        case SIOCGIFCAP:
        case SIOCGIFMAC:
        case SIOCGIFMETRIC:
        case SIOCGIFMTU:
        case SIOCGIFPHYS:
        case SIOCGIFTYPE:
        case SIOCGIFFUNCTIONALTYPE:
        case SIOCGIFPSRCADDR:
        case SIOCGIFPDSTADDR:
        case SIOCGIFGENERIC:
        case SIOCGIFDEVMTU:
        case SIOCGIFVLAN:
        case SIOCGIFBOND:
        case SIOCGIFWAKEFLAGS:
        case SIOCGIFGETRTREFCNT:
        case SIOCGIFOPPORTUNISTIC:
        case SIOCGIFLINKQUALITYMETRIC:
        case SIOCGIFLOG:
        case SIOCGIFDELEGATE:
        case SIOCGIFEXPENSIVE:
        case SIOCGIFINTERFACESTATE:
        case SIOCGIFPROBECONNECTIVITY:
        case SIOCGIFTIMESTAMPENABLED:
        case SIOCGECNMODE:
        case SIOCGQOSMARKINGMODE:
        case SIOCGQOSMARKINGENABLED:
        case SIOCGIFLOWINTERNET:
        case SIOCGIFSTATUS:
        case SIOCGIFMEDIA32:
        case SIOCGIFMEDIA64:
        case SIOCGIFDESC:
        case SIOCGIFLINKPARAMS:
        case SIOCGIFQUEUESTATS:
        case SIOCGIFTHROTTLE:
        case SIOCGIFAGENTIDS32:
        case SIOCGIFAGENTIDS64:
        case SIOCGIFNETSIGNATURE:
        case SIOCGIFINFO_IN6:
        case SIOCGIFAFLAG_IN6:
        case SIOCGNBRINFO_IN6:
        case SIOCGIFALIFETIME_IN6:
        case SIOCGIFNETMASK_IN6:
                return (false);
        default:
#if (DEBUG || DEVELOPMENT)
                printf("%s: cmd 0x%lx not allowed (pid %u)\n",
                    __func__, cmd, proc_pid(p));
#endif
                return (true);
        }
        return (false);
}

/*
 * Interface ioctls.
 *
 * Most of the routines called to handle the ioctls would end up being
 * tail-call optimized, which unfortunately causes this routine to
 * consume too much stack space; this is the reason for the "noinline"
 * attribute used on those routines.
 */
int
ifioctl(struct socket *so, u_long cmd, caddr_t data, struct proc *p)
{
        char ifname[IFNAMSIZ + 1];
        struct ifnet *ifp = NULL;
        struct ifstat *ifs = NULL;
        int error = 0;

        bzero(ifname, sizeof (ifname));

        /*
         * ioctls which don't require ifp, or ifreq ioctls
         */
        switch (cmd) {
        case OSIOCGIFCONF32:                    /* struct ifconf32 */
        case SIOCGIFCONF32:                     /* struct ifconf32 */
        case SIOCGIFCONF64:                     /* struct ifconf64 */
        case OSIOCGIFCONF64:                    /* struct ifconf64 */
                error = ifioctl_ifconf(cmd, data);
                goto done;

        case SIOCIFGCLONERS32:                  /* struct if_clonereq32 */
        case SIOCIFGCLONERS64:                  /* struct if_clonereq64 */
                error = ifioctl_ifclone(cmd, data);
                goto done;

        case SIOCGIFAGENTDATA32:                /* struct netagent_req32 */
        case SIOCGIFAGENTDATA64:                /* struct netagent_req64 */
        case SIOCGIFAGENTLIST32:                /* struct netagentlist_req32 */
        case SIOCGIFAGENTLIST64:                /* struct netagentlist_req64 */
                error = netagent_ioctl(cmd, data);
                goto done;

        case SIOCSIFORDER:                      /* struct if_order */
        case SIOCGIFORDER:              /* struct if_order */
                error = ifioctl_iforder(cmd, data);
                goto done;

        case SIOCSIFDSTADDR:                    /* struct ifreq */
        case SIOCSIFADDR:                       /* struct ifreq */
        case SIOCSIFBRDADDR:                    /* struct ifreq */
        case SIOCSIFNETMASK:                    /* struct ifreq */
        case OSIOCGIFADDR:                      /* struct ifreq */
        case OSIOCGIFDSTADDR:                   /* struct ifreq */
        case OSIOCGIFBRDADDR:                   /* struct ifreq */
        case OSIOCGIFNETMASK:                   /* struct ifreq */
        case SIOCSIFKPI:                        /* struct ifreq */
                if (so->so_proto == NULL) {
                        error = EOPNOTSUPP;
                        goto done;
                }
                /* FALLTHRU */
        case SIOCIFCREATE:                      /* struct ifreq */
        case SIOCIFCREATE2:                     /* struct ifreq */
        case SIOCIFDESTROY:                     /* struct ifreq */
        case SIOCGIFFLAGS:                      /* struct ifreq */
        case SIOCGIFEFLAGS:                     /* struct ifreq */
        case SIOCGIFCAP:                        /* struct ifreq */
#if CONFIG_MACF_NET
        case SIOCGIFMAC:                        /* struct ifreq */
        case SIOCSIFMAC:                        /* struct ifreq */
#endif /* CONFIG_MACF_NET */
        case SIOCGIFMETRIC:                     /* struct ifreq */
        case SIOCGIFMTU:                        /* struct ifreq */
        case SIOCGIFPHYS:                       /* struct ifreq */
        case SIOCSIFFLAGS:                      /* struct ifreq */
        case SIOCSIFCAP:                        /* struct ifreq */
        case SIOCSIFMETRIC:                     /* struct ifreq */
        case SIOCSIFPHYS:                       /* struct ifreq */
        case SIOCSIFMTU:                        /* struct ifreq */
        case SIOCADDMULTI:                      /* struct ifreq */
        case SIOCDELMULTI:                      /* struct ifreq */
        case SIOCDIFPHYADDR:                    /* struct ifreq */
        case SIOCSIFMEDIA:                      /* struct ifreq */
        case SIOCSIFGENERIC:                    /* struct ifreq */
        case SIOCSIFLLADDR:                     /* struct ifreq */
        case SIOCSIFALTMTU:                     /* struct ifreq */
        case SIOCSIFVLAN:                       /* struct ifreq */
        case SIOCSIFBOND:                       /* struct ifreq */
        case SIOCGIFLLADDR:                     /* struct ifreq */
        case SIOCGIFTYPE:                       /* struct ifreq */
        case SIOCGIFFUNCTIONALTYPE:             /* struct ifreq */
        case SIOCGIFPSRCADDR:                   /* struct ifreq */
        case SIOCGIFPDSTADDR:                   /* struct ifreq */
        case SIOCGIFGENERIC:                    /* struct ifreq */
        case SIOCGIFDEVMTU:                     /* struct ifreq */
        case SIOCGIFVLAN:                       /* struct ifreq */
        case SIOCGIFBOND:                       /* struct ifreq */
        case SIOCGIFWAKEFLAGS:                  /* struct ifreq */
        case SIOCGIFGETRTREFCNT:                /* struct ifreq */
        case SIOCSIFOPPORTUNISTIC:              /* struct ifreq */
        case SIOCGIFOPPORTUNISTIC:              /* struct ifreq */
        case SIOCGIFLINKQUALITYMETRIC:          /* struct ifreq */
        case SIOCSIFLOG:                        /* struct ifreq */
        case SIOCGIFLOG:                        /* struct ifreq */
        case SIOCGIFDELEGATE:                   /* struct ifreq */
        case SIOCGIFEXPENSIVE:                  /* struct ifreq */
        case SIOCSIFEXPENSIVE:                  /* struct ifreq */
        case SIOCSIF2KCL:                       /* struct ifreq */
        case SIOCGIF2KCL:                       /* struct ifreq */
        case SIOCSIFINTERFACESTATE:             /* struct ifreq */
        case SIOCGIFINTERFACESTATE:             /* struct ifreq */
        case SIOCSIFPROBECONNECTIVITY:          /* struct ifreq */
        case SIOCGIFPROBECONNECTIVITY:          /* struct ifreq */
        case SIOCGSTARTDELAY:                   /* struct ifreq */
        case SIOCSIFTIMESTAMPENABLE:            /* struct ifreq */
        case SIOCSIFTIMESTAMPDISABLE:           /* struct ifreq */
        case SIOCGIFTIMESTAMPENABLED:           /* struct ifreq */
#if (DEBUG || DEVELOPMENT)
        case SIOCSIFDISABLEOUTPUT:              /* struct ifreq */
#endif /* (DEBUG || DEVELOPMENT) */
        case SIOCGECNMODE:                      /* struct ifreq */
        case SIOCSECNMODE:
        case SIOCSQOSMARKINGMODE:               /* struct ifreq */
        case SIOCSQOSMARKINGENABLED:            /* struct ifreq */
        case SIOCGQOSMARKINGMODE:               /* struct ifreq */
        case SIOCGQOSMARKINGENABLED:            /* struct ifreq */
        case SIOCSIFLOWINTERNET:                /* struct ifreq */
        case SIOCGIFLOWINTERNET:                /* struct ifreq */
        {                       /* struct ifreq */
                struct ifreq ifr;
                bcopy(data, &ifr, sizeof (ifr));
                ifr.ifr_name[IFNAMSIZ - 1] = '\0';
                bcopy(&ifr.ifr_name, ifname, IFNAMSIZ);
                if (ifioctl_restrict_intcoproc(cmd, ifname, NULL, p) == true) {
                        error = EPERM;
                        goto done;
                }
                error = ifioctl_ifreq(so, cmd, &ifr, p);
                bcopy(&ifr, data, sizeof (ifr));
                goto done;
        }
        }

        /*
         * ioctls which require ifp.  Note that we acquire dlil_ifnet_lock
         * here to ensure that the ifnet, if found, has been fully attached.
         */
        dlil_if_lock();
        switch (cmd) {
        case SIOCSIFPHYADDR:                    /* struct {if,in_}aliasreq */
                bcopy(((struct in_aliasreq *)(void *)data)->ifra_name,
                    ifname, IFNAMSIZ);
                ifp = ifunit(ifname);
                break;

#if INET6
        case SIOCSIFPHYADDR_IN6_32:             /* struct in6_aliasreq_32 */
                bcopy(((struct in6_aliasreq_32 *)(void *)data)->ifra_name,
                    ifname, IFNAMSIZ);
                ifp = ifunit(ifname);
                break;

        case SIOCSIFPHYADDR_IN6_64:             /* struct in6_aliasreq_64 */
                bcopy(((struct in6_aliasreq_64 *)(void *)data)->ifra_name,
                    ifname, IFNAMSIZ);
                ifp = ifunit(ifname);
                break;
#endif /* INET6 */

        case SIOCGIFSTATUS:                     /* struct ifstat */
                ifs = _MALLOC(sizeof (*ifs), M_DEVBUF, M_WAITOK);
                if (ifs == NULL) {
                        error = ENOMEM;
                        dlil_if_unlock();
                        goto done;
                }
                bcopy(data, ifs, sizeof (*ifs));
                ifs->ifs_name[IFNAMSIZ - 1] = '\0';
                bcopy(ifs->ifs_name, ifname, IFNAMSIZ);
                ifp = ifunit(ifname);
                break;

        case SIOCGIFMEDIA32:                    /* struct ifmediareq32 */
                bcopy(((struct ifmediareq32 *)(void *)data)->ifm_name,
                    ifname, IFNAMSIZ);
                ifp = ifunit(ifname);
                break;

        case SIOCGIFMEDIA64:                    /* struct ifmediareq64 */
                bcopy(((struct ifmediareq64 *)(void *)data)->ifm_name,
                    ifname, IFNAMSIZ);
                ifp = ifunit(ifname);
                break;

        case SIOCSIFDESC:                       /* struct if_descreq */
        case SIOCGIFDESC:                       /* struct if_descreq */
                bcopy(((struct if_descreq *)(void *)data)->ifdr_name,
                    ifname, IFNAMSIZ);
                ifp = ifunit(ifname);
                break;

        case SIOCSIFLINKPARAMS:                 /* struct if_linkparamsreq */
        case SIOCGIFLINKPARAMS:                 /* struct if_linkparamsreq */
                bcopy(((struct if_linkparamsreq *)(void *)data)->iflpr_name,
                    ifname, IFNAMSIZ);
                ifp = ifunit(ifname);
                break;

        case SIOCGIFQUEUESTATS:                 /* struct if_qstatsreq */
                bcopy(((struct if_qstatsreq *)(void *)data)->ifqr_name,
                    ifname, IFNAMSIZ);
                ifp = ifunit(ifname);
                break;

        case SIOCSIFTHROTTLE:                   /* struct if_throttlereq */
        case SIOCGIFTHROTTLE:                   /* struct if_throttlereq */
                bcopy(((struct if_throttlereq *)(void *)data)->ifthr_name,
                    ifname, IFNAMSIZ);
                ifp = ifunit(ifname);
                break;

        case SIOCAIFAGENTID:                    /* struct if_agentidreq */
        case SIOCDIFAGENTID:                    /* struct if_agentidreq */
        case SIOCGIFAGENTIDS32:         /* struct if_agentidsreq32 */
        case SIOCGIFAGENTIDS64:         /* struct if_agentidsreq64 */
                bcopy(((struct if_agentidreq *)(void *)data)->ifar_name,
                    ifname, IFNAMSIZ);
                ifp = ifunit(ifname);
                break;

        case SIOCSIFNETSIGNATURE:               /* struct if_nsreq */
        case SIOCGIFNETSIGNATURE:               /* struct if_nsreq */
                bcopy(((struct if_nsreq *)(void *)data)->ifnsr_name,
                    ifname, IFNAMSIZ);
                ifp = ifunit(ifname);
                break;

        default:
                /*
                 * This is a bad assumption, but the code seems to
                 * have been doing this in the past; caveat emptor.
                 */
                bcopy(((struct ifreq *)(void *)data)->ifr_name,
                    ifname, IFNAMSIZ);
                ifp = ifunit(ifname);
                break;
        }
        dlil_if_unlock();

        if (ifp == NULL) {
                error = ENXIO;
                goto done;
        }

        if (ifioctl_restrict_intcoproc(cmd, NULL, ifp, p) == true) {
                error = EPERM;
                goto done;
        }
        switch (cmd) {
        case SIOCSIFPHYADDR:                    /* struct {if,in_}aliasreq */
#if INET6
        case SIOCSIFPHYADDR_IN6_32:             /* struct in6_aliasreq_32 */
        case SIOCSIFPHYADDR_IN6_64:             /* struct in6_aliasreq_64 */
#endif /* INET6 */
                error = proc_suser(p);
                if (error != 0)
                        break;

                error = ifnet_ioctl(ifp, SOCK_DOM(so), cmd, data);
                if (error != 0)
                        break;

                ifnet_touch_lastchange(ifp);
                break;

        case SIOCGIFSTATUS:                     /* struct ifstat */
                VERIFY(ifs != NULL);
                ifs->ascii[0] = '\0';

                error = ifnet_ioctl(ifp, SOCK_DOM(so), cmd, (caddr_t)ifs);

                bcopy(ifs, data, sizeof (*ifs));
                break;

        case SIOCGIFMEDIA32:                    /* struct ifmediareq32 */
        case SIOCGIFMEDIA64:                    /* struct ifmediareq64 */
                error = ifnet_ioctl(ifp, SOCK_DOM(so), cmd, data);
                break;

        case SIOCSIFDESC:                       /* struct if_descreq */
        case SIOCGIFDESC:                       /* struct if_descreq */
                error = ifioctl_ifdesc(ifp, cmd, data, p);
                break;

        case SIOCSIFLINKPARAMS:                 /* struct if_linkparamsreq */
        case SIOCGIFLINKPARAMS:                 /* struct if_linkparamsreq */
                error = ifioctl_linkparams(ifp, cmd, data, p);
                break;

        case SIOCGIFQUEUESTATS:                 /* struct if_qstatsreq */
                error = ifioctl_qstats(ifp, cmd, data);
                break;

        case SIOCSIFTHROTTLE:                   /* struct if_throttlereq */
        case SIOCGIFTHROTTLE:                   /* struct if_throttlereq */
                error = ifioctl_throttle(ifp, cmd, data, p);
                break;

        case SIOCAIFAGENTID:                    /* struct if_agentidreq */
        case SIOCDIFAGENTID:                    /* struct if_agentidreq */
        case SIOCGIFAGENTIDS32:         /* struct if_agentidsreq32 */
        case SIOCGIFAGENTIDS64:         /* struct if_agentidsreq64 */
                error = ifioctl_netagent(ifp, cmd, data, p);
                break;

        case SIOCSIFNETSIGNATURE:               /* struct if_nsreq */
        case SIOCGIFNETSIGNATURE:               /* struct if_nsreq */
                error = ifioctl_netsignature(ifp, cmd, data);
                break;

#if INET6
        case SIOCSIFNAT64PREFIX:                /* struct if_nsreq */
        case SIOCGIFNAT64PREFIX:                /* struct if_nsreq */
                error = ifioctl_nat64prefix(ifp, cmd, data);
                break;
#endif
        default:
                if (so->so_proto == NULL) {
                        error = EOPNOTSUPP;
                        break;
                }

                socket_lock(so, 1);
                error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,
                    data, ifp, p));
                socket_unlock(so, 1);

                if (error == EOPNOTSUPP || error == ENOTSUP) {
                        error = ifnet_ioctl(ifp, SOCK_DOM(so), cmd, data);
                }
                break;
        }

done:
        if (ifs != NULL)
                _FREE(ifs, M_DEVBUF);

        if (if_verbose) {
                if (ifname[0] == '\0')
                        (void) snprintf(ifname, sizeof (ifname), "%s",
                            "NULL");
                else if (ifp != NULL)
                        (void) snprintf(ifname, sizeof (ifname), "%s",
                            if_name(ifp));

                if (error != 0) {
                        printf("%s[%s,%d]: ifp %s cmd 0x%08lx (%c%c [%lu] "
                            "%c %lu) error %d\n", __func__,
                            proc_name_address(p), proc_pid(p),
                            ifname, cmd, (cmd & IOC_IN) ? 'I' : ' ',
                            (cmd & IOC_OUT) ? 'O' : ' ', IOCPARM_LEN(cmd),
                            (char)IOCGROUP(cmd), cmd & 0xff, error);
                } else if (if_verbose > 1) {
                        printf("%s[%s,%d]: ifp %s cmd 0x%08lx (%c%c [%lu] "
                            "%c %lu) OK\n", __func__,
                            proc_name_address(p), proc_pid(p),
                            ifname, cmd, (cmd & IOC_IN) ? 'I' : ' ',
                            (cmd & IOC_OUT) ? 'O' : ' ', IOCPARM_LEN(cmd),
                            (char)IOCGROUP(cmd), cmd & 0xff);
                }
        }

        return (error);
}

static __attribute__((noinline)) int
ifioctl_ifreq(struct socket *so, u_long cmd, struct ifreq *ifr, struct proc *p)
{
        struct ifnet *ifp;
        u_long ocmd = cmd;
        int error = 0;
        struct kev_msg ev_msg;
        struct net_event_data ev_data;

        bzero(&ev_data, sizeof (struct net_event_data));
        bzero(&ev_msg, sizeof (struct kev_msg));

        switch (cmd) {
        case SIOCIFCREATE:
        case SIOCIFCREATE2:
                error = proc_suser(p);
                if (error)
                        return (error);
                return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name),
                    cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL));
        case SIOCIFDESTROY:
                error = proc_suser(p);
                if (error)
                        return (error);
                return (if_clone_destroy(ifr->ifr_name));
        }

        /*
         * ioctls which require ifp.  Note that we acquire dlil_ifnet_lock
         * here to ensure that the ifnet, if found, has been fully attached.
         */
        dlil_if_lock();
        ifp = ifunit(ifr->ifr_name);
        dlil_if_unlock();

        if (ifp == NULL)
                return (ENXIO);

        switch (cmd) {
        case SIOCGIFFLAGS:
                ifnet_lock_shared(ifp);
                ifr->ifr_flags = ifp->if_flags;
                ifnet_lock_done(ifp);
                break;

        case SIOCGIFEFLAGS:
                ifnet_lock_shared(ifp);
                ifr->ifr_eflags = ifp->if_eflags;
                ifnet_lock_done(ifp);
                break;

        case SIOCGIFCAP:
                ifnet_lock_shared(ifp);
                ifr->ifr_reqcap = ifp->if_capabilities;
                ifr->ifr_curcap = ifp->if_capenable;
                ifnet_lock_done(ifp);
                break;

#if CONFIG_MACF_NET
        case SIOCGIFMAC:
                error = mac_ifnet_label_get(kauth_cred_get(), ifr, ifp);
                break;

        case SIOCSIFMAC:
                error = mac_ifnet_label_set(kauth_cred_get(), ifr, ifp);
                break;
#endif /* CONFIG_MACF_NET */

        case SIOCGIFMETRIC:
                ifnet_lock_shared(ifp);
                ifr->ifr_metric = ifp->if_metric;
                ifnet_lock_done(ifp);
                break;

        case SIOCGIFMTU:
                ifnet_lock_shared(ifp);
                ifr->ifr_mtu = ifp->if_mtu;
                ifnet_lock_done(ifp);
                break;

        case SIOCGIFPHYS:
                ifnet_lock_shared(ifp);
                ifr->ifr_phys = ifp->if_physical;
                ifnet_lock_done(ifp);
                break;

        case SIOCSIFFLAGS:
                error = proc_suser(p);
                if (error != 0)
                        break;

                (void) ifnet_set_flags(ifp, ifr->ifr_flags,
                    (u_int16_t)~IFF_CANTCHANGE);

                /*
                 * Note that we intentionally ignore any error from below
                 * for the SIOCSIFFLAGS case.
                 */
                (void) ifnet_ioctl(ifp, SOCK_DOM(so), cmd, (caddr_t)ifr);

                /*
                 * Send the event even upon error from the driver because
                 * we changed the flags.
                 */
                ev_msg.vendor_code    = KEV_VENDOR_APPLE;
                ev_msg.kev_class      = KEV_NETWORK_CLASS;
                ev_msg.kev_subclass   = KEV_DL_SUBCLASS;

                ev_msg.event_code = KEV_DL_SIFFLAGS;
                strlcpy(&ev_data.if_name[0], ifp->if_name, IFNAMSIZ);
                ev_data.if_family = ifp->if_family;
                ev_data.if_unit   = (u_int32_t) ifp->if_unit;
                ev_msg.dv[0].data_length = sizeof(struct net_event_data);
                ev_msg.dv[0].data_ptr    = &ev_data;
                ev_msg.dv[1].data_length = 0;
                dlil_post_complete_msg(ifp, &ev_msg);

                ifnet_touch_lastchange(ifp);
                break;

        case SIOCSIFCAP:
                error = proc_suser(p);
                if (error != 0)
                        break;

                if ((ifr->ifr_reqcap & ~ifp->if_capabilities)) {
                        error = EINVAL;
                        break;
                }
                error = ifnet_ioctl(ifp, SOCK_DOM(so), cmd, (caddr_t)ifr);

                ifnet_touch_lastchange(ifp);
                break;

        case SIOCSIFMETRIC:
                error = proc_suser(p);
                if (error != 0)
                        break;

                ifp->if_metric = ifr->ifr_metric;

                ev_msg.vendor_code    = KEV_VENDOR_APPLE;
                ev_msg.kev_class      = KEV_NETWORK_CLASS;
                ev_msg.kev_subclass   = KEV_DL_SUBCLASS;

                ev_msg.event_code = KEV_DL_SIFMETRICS;
                strlcpy(&ev_data.if_name[0], ifp->if_name, IFNAMSIZ);
                ev_data.if_family = ifp->if_family;
                ev_data.if_unit   = (u_int32_t) ifp->if_unit;
                ev_msg.dv[0].data_length = sizeof(struct net_event_data);
                ev_msg.dv[0].data_ptr    = &ev_data;

                ev_msg.dv[1].data_length = 0;
                dlil_post_complete_msg(ifp, &ev_msg);

                ifnet_touch_lastchange(ifp);
                break;

        case SIOCSIFPHYS:
                error = proc_suser(p);
                if (error != 0)
                        break;

                error = ifnet_ioctl(ifp, SOCK_DOM(so), cmd, (caddr_t)ifr);
                if (error != 0)
                        break;

                ev_msg.vendor_code    = KEV_VENDOR_APPLE;
                ev_msg.kev_class      = KEV_NETWORK_CLASS;
                ev_msg.kev_subclass   = KEV_DL_SUBCLASS;

                ev_msg.event_code = KEV_DL_SIFPHYS;
                strlcpy(&ev_data.if_name[0], ifp->if_name, IFNAMSIZ);
                ev_data.if_family = ifp->if_family;
                ev_data.if_unit   = (u_int32_t) ifp->if_unit;
                ev_msg.dv[0].data_length = sizeof(struct net_event_data);
                ev_msg.dv[0].data_ptr    = &ev_data;
                ev_msg.dv[1].data_length = 0;
                dlil_post_complete_msg(ifp, &ev_msg);

                ifnet_touch_lastchange(ifp);
                break;

        case SIOCSIFMTU: {
                u_int32_t oldmtu = ifp->if_mtu;
                struct ifclassq *ifq = &ifp->if_snd;

                error = proc_suser(p);
                if (error != 0)
                        break;

                if (ifp->if_ioctl == NULL) {
                        error = EOPNOTSUPP;
                        break;
                }
                if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) {
                        error = EINVAL;
                        break;
                }
                error = ifnet_ioctl(ifp, SOCK_DOM(so), cmd, (caddr_t)ifr);
                if (error != 0)
                        break;

                ev_msg.vendor_code    = KEV_VENDOR_APPLE;
                ev_msg.kev_class      = KEV_NETWORK_CLASS;
                ev_msg.kev_subclass   = KEV_DL_SUBCLASS;

                ev_msg.event_code = KEV_DL_SIFMTU;
                strlcpy(&ev_data.if_name[0], ifp->if_name, IFNAMSIZ);
                ev_data.if_family = ifp->if_family;
                ev_data.if_unit   = (u_int32_t) ifp->if_unit;
                ev_msg.dv[0].data_length = sizeof(struct net_event_data);
                ev_msg.dv[0].data_ptr    = &ev_data;
                ev_msg.dv[1].data_length = 0;
                dlil_post_complete_msg(ifp, &ev_msg);

                ifnet_touch_lastchange(ifp);
                rt_ifmsg(ifp);

                /*
                 * If the link MTU changed, do network layer specific procedure
                 * and update all route entries associated with the interface,
                 * so that their MTU metric gets updated.
                 */
                if (ifp->if_mtu != oldmtu) {
                        if_rtmtu_update(ifp);
#if INET6
                        nd6_setmtu(ifp);
#endif /* INET6 */
                        /* Inform all transmit queues about the new MTU */
                        IFCQ_LOCK(ifq);
                        ifnet_update_sndq(ifq, CLASSQ_EV_LINK_MTU);
                        IFCQ_UNLOCK(ifq);
                }
                break;
        }

        case SIOCADDMULTI:
        case SIOCDELMULTI:
                error = proc_suser(p);
                if (error != 0)
                        break;

                /* Don't allow group membership on non-multicast interfaces. */
                if ((ifp->if_flags & IFF_MULTICAST) == 0) {
                        error = EOPNOTSUPP;
                        break;
                }

                /* Don't let users screw up protocols' entries. */
                if (ifr->ifr_addr.sa_family != AF_UNSPEC &&
                    ifr->ifr_addr.sa_family != AF_LINK) {
                        error = EINVAL;
                        break;
                }

                /*
                 * User is permitted to anonymously join a particular link
                 * multicast group via SIOCADDMULTI.  Subsequent join requested
                 * for the same record which has an outstanding refcnt from a
                 * past if_addmulti_anon() will not result in EADDRINUSE error
                 * (unlike other BSDs.)  Anonymously leaving a group is also
                 * allowed only as long as there is an outstanding refcnt held
                 * by a previous anonymous request, or else ENOENT (even if the
                 * link-layer multicast membership exists for a network-layer
                 * membership.)
                 */
                if (cmd == SIOCADDMULTI) {
                        error = if_addmulti_anon(ifp, &ifr->ifr_addr, NULL);
                        ev_msg.event_code = KEV_DL_ADDMULTI;
                } else {
                        error = if_delmulti_anon(ifp, &ifr->ifr_addr);
                        ev_msg.event_code = KEV_DL_DELMULTI;
                }
                if (error != 0)
                        break;

                ev_msg.vendor_code    = KEV_VENDOR_APPLE;
                ev_msg.kev_class      = KEV_NETWORK_CLASS;
                ev_msg.kev_subclass   = KEV_DL_SUBCLASS;
                strlcpy(&ev_data.if_name[0], ifp->if_name, IFNAMSIZ);

                ev_data.if_family = ifp->if_family;
                ev_data.if_unit   = (u_int32_t) ifp->if_unit;
                ev_msg.dv[0].data_length = sizeof(struct net_event_data);
                ev_msg.dv[0].data_ptr    = &ev_data;
                ev_msg.dv[1].data_length = 0;
                dlil_post_complete_msg(ifp, &ev_msg);

                ifnet_touch_lastchange(ifp);
                break;

        case SIOCDIFPHYADDR:
        case SIOCSIFMEDIA:
        case SIOCSIFGENERIC:
        case SIOCSIFLLADDR:
        case SIOCSIFALTMTU:
        case SIOCSIFVLAN:
        case SIOCSIFBOND:
                error = proc_suser(p);
                if (error != 0)
                        break;

                error = ifnet_ioctl(ifp, SOCK_DOM(so), cmd, (caddr_t)ifr);
                if (error != 0)
                        break;

                ifnet_touch_lastchange(ifp);
                break;

        case SIOCGIFLLADDR: {
                struct sockaddr_dl *sdl = SDL(ifp->if_lladdr->ifa_addr);

                if (sdl->sdl_alen == 0) {
                        error = EADDRNOTAVAIL;
                        break;
                }
                /* If larger than 14-bytes we'll need another mechanism */
                if (sdl->sdl_alen > sizeof (ifr->ifr_addr.sa_data)) {
                        error = EMSGSIZE;
                        break;
                }
                /* Follow the same convention used by SIOCSIFLLADDR */
                bzero(&ifr->ifr_addr, sizeof (ifr->ifr_addr));
                ifr->ifr_addr.sa_family = AF_LINK;
                ifr->ifr_addr.sa_len = sdl->sdl_alen;
                error = ifnet_guarded_lladdr_copy_bytes(ifp,
                    &ifr->ifr_addr.sa_data, sdl->sdl_alen);
                break;
        }

        case SIOCGIFTYPE:
                ifr->ifr_type.ift_type = ifp->if_type;
                ifr->ifr_type.ift_family = ifp->if_family;
                ifr->ifr_type.ift_subfamily = ifp->if_subfamily;
                break;

        case SIOCGIFFUNCTIONALTYPE:
                ifr->ifr_functional_type = if_functional_type(ifp, FALSE);
                break;

        case SIOCGIFPSRCADDR:
        case SIOCGIFPDSTADDR:
        case SIOCGIFGENERIC:
        case SIOCGIFDEVMTU:
        case SIOCGIFVLAN:
        case SIOCGIFBOND:
                error = ifnet_ioctl(ifp, SOCK_DOM(so), cmd, (caddr_t)ifr);
                break;

        case SIOCGIFWAKEFLAGS:
                ifnet_lock_shared(ifp);
                ifr->ifr_wake_flags = ifnet_get_wake_flags(ifp);
                ifnet_lock_done(ifp);
                break;

        case SIOCGIFGETRTREFCNT:
                ifnet_lock_shared(ifp);
                ifr->ifr_route_refcnt = ifp->if_route_refcnt;
                ifnet_lock_done(ifp);
                break;

        case SIOCSIFOPPORTUNISTIC:
        case SIOCGIFOPPORTUNISTIC:
                error = ifnet_getset_opportunistic(ifp, cmd, ifr, p);
                break;

        case SIOCGIFLINKQUALITYMETRIC:
                ifnet_lock_shared(ifp);
                if ((ifp->if_interface_state.valid_bitmask &
                    IF_INTERFACE_STATE_LQM_STATE_VALID)) {
                        ifr->ifr_link_quality_metric =
                            ifp->if_interface_state.lqm_state;
                } else if (IF_FULLY_ATTACHED(ifp)) {
                        ifr->ifr_link_quality_metric =
                            IFNET_LQM_THRESH_UNKNOWN;
                } else {
                        ifr->ifr_link_quality_metric =
                            IFNET_LQM_THRESH_OFF;
                }
                ifnet_lock_done(ifp);
                break;

        case SIOCSIFLOG:
        case SIOCGIFLOG:
                error = ifnet_getset_log(ifp, cmd, ifr, p);
                break;

        case SIOCGIFDELEGATE:
                ifnet_lock_shared(ifp);
                ifr->ifr_delegated = ((ifp->if_delegated.ifp != NULL) ?
                    ifp->if_delegated.ifp->if_index : 0);
                ifnet_lock_done(ifp);
                break;

        case SIOCGIFEXPENSIVE:
                ifnet_lock_shared(ifp);
                if (ifp->if_eflags & IFEF_EXPENSIVE)
                        ifr->ifr_expensive = 1;
                else
                        ifr->ifr_expensive = 0;
                ifnet_lock_done(ifp);
                break;

        case SIOCSIFEXPENSIVE:
        {
                struct ifnet *difp;

                if ((error = priv_check_cred(kauth_cred_get(),
                    PRIV_NET_INTERFACE_CONTROL, 0)) != 0)
                        return (error);
                ifnet_lock_exclusive(ifp);
                if (ifr->ifr_expensive)
                        ifp->if_eflags |= IFEF_EXPENSIVE;
                else
                        ifp->if_eflags &= ~IFEF_EXPENSIVE;
                ifnet_lock_done(ifp);
                /*
                 * Update the expensive bit in the delegated interface
                 * structure.
                 */
                ifnet_head_lock_shared();
                TAILQ_FOREACH(difp, &ifnet_head, if_link) {
                        ifnet_lock_exclusive(difp);
                        if (difp->if_delegated.ifp == ifp) {
                                difp->if_delegated.expensive =
                                    ifp->if_eflags & IFEF_EXPENSIVE ? 1 : 0;

                        }
                        ifnet_lock_done(difp);
                }
                ifnet_head_done();
                break;
        }

        case SIOCGIF2KCL:
                ifnet_lock_shared(ifp);
                if (ifp->if_eflags & IFEF_2KCL)
                        ifr->ifr_2kcl = 1;
                else
                        ifr->ifr_2kcl = 0;
                ifnet_lock_done(ifp);
                break;

        case SIOCSIF2KCL:
                if ((error = priv_check_cred(kauth_cred_get(),
                    PRIV_NET_INTERFACE_CONTROL, 0)) != 0)
                        return (error);
                ifnet_lock_exclusive(ifp);
                if (ifr->ifr_2kcl)
                        ifp->if_eflags |= IFEF_2KCL;
                else
                        ifp->if_eflags &= ~IFEF_2KCL;
                ifnet_lock_done(ifp);
                break;
        case SIOCGSTARTDELAY:
                ifnet_lock_shared(ifp);
                if (ifp->if_eflags & IFEF_ENQUEUE_MULTI) {
                        ifr->ifr_start_delay_qlen =
                            ifp->if_start_delay_qlen;
                        ifr->ifr_start_delay_timeout =
                            ifp->if_start_delay_timeout;
                } else {
                        ifr->ifr_start_delay_qlen = 0;
                        ifr->ifr_start_delay_timeout = 0;
                }
                ifnet_lock_done(ifp);
                break;
        case SIOCSIFDSTADDR:
        case SIOCSIFADDR:
        case SIOCSIFBRDADDR:
        case SIOCSIFNETMASK:
        case OSIOCGIFADDR:
        case OSIOCGIFDSTADDR:
        case OSIOCGIFBRDADDR:
        case OSIOCGIFNETMASK:
        case SIOCSIFKPI:
                VERIFY(so->so_proto != NULL);

                if (cmd == SIOCSIFDSTADDR || cmd == SIOCSIFADDR ||
                    cmd == SIOCSIFBRDADDR || cmd == SIOCSIFNETMASK) {
#if BYTE_ORDER != BIG_ENDIAN
                        if (ifr->ifr_addr.sa_family == 0 &&
                            ifr->ifr_addr.sa_len < 16) {
                                ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
                                ifr->ifr_addr.sa_len = 16;
                        }
#else
                        if (ifr->ifr_addr.sa_len == 0)
                                ifr->ifr_addr.sa_len = 16;
#endif
                } else if (cmd == OSIOCGIFADDR) {
                        cmd = SIOCGIFADDR;      /* struct ifreq */
                } else if (cmd == OSIOCGIFDSTADDR) {
                        cmd = SIOCGIFDSTADDR;   /* struct ifreq */
                } else if (cmd == OSIOCGIFBRDADDR) {
                        cmd = SIOCGIFBRDADDR;   /* struct ifreq */
                } else if (cmd == OSIOCGIFNETMASK) {
                        cmd = SIOCGIFNETMASK;   /* struct ifreq */
                }

                socket_lock(so, 1);
                error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,
                    (caddr_t)ifr, ifp, p));
                socket_unlock(so, 1);

                switch (ocmd) {
                case OSIOCGIFADDR:
                case OSIOCGIFDSTADDR:
                case OSIOCGIFBRDADDR:
                case OSIOCGIFNETMASK:
                        bcopy(&ifr->ifr_addr.sa_family, &ifr->ifr_addr,
                            sizeof (u_short));
                }

                if (cmd == SIOCSIFKPI) {
                        int temperr = proc_suser(p);
                        if (temperr != 0)
                                error = temperr;
                }

                if (error == EOPNOTSUPP || error == ENOTSUP) {
                        error = ifnet_ioctl(ifp, SOCK_DOM(so), cmd,
                            (caddr_t)ifr);
                }
                break;

        case SIOCGIFINTERFACESTATE:
                if_get_state(ifp, &ifr->ifr_interface_state);

                break;
        case SIOCSIFINTERFACESTATE:
                if ((error = priv_check_cred(kauth_cred_get(),
                    PRIV_NET_INTERFACE_CONTROL, 0)) != 0)
                        return (error);

                error = if_state_update(ifp, &ifr->ifr_interface_state);

                break;
        case SIOCSIFPROBECONNECTIVITY:
                if ((error = priv_check_cred(kauth_cred_get(),
                    PRIV_NET_INTERFACE_CONTROL, 0)) != 0)
                        return (error);
                error = if_probe_connectivity(ifp,
                    ifr->ifr_probe_connectivity);
                break;
        case SIOCGIFPROBECONNECTIVITY:
                if ((error = priv_check_cred(kauth_cred_get(),
                    PRIV_NET_INTERFACE_CONTROL, 0)) != 0)
                        return (error);
                if (ifp->if_eflags & IFEF_PROBE_CONNECTIVITY)
                        ifr->ifr_probe_connectivity = 1;
                else
                        ifr->ifr_probe_connectivity = 0;
                break;
        case SIOCGECNMODE:
                if ((ifp->if_eflags & (IFEF_ECN_ENABLE|IFEF_ECN_DISABLE)) ==
                    IFEF_ECN_ENABLE)
                        ifr->ifr_ecn_mode = IFRTYPE_ECN_ENABLE;
                else if ((ifp->if_eflags & (IFEF_ECN_ENABLE|IFEF_ECN_DISABLE)) ==
                    IFEF_ECN_DISABLE)
                        ifr->ifr_ecn_mode = IFRTYPE_ECN_DISABLE;
                else
                        ifr->ifr_ecn_mode = IFRTYPE_ECN_DEFAULT;
                break;
        case SIOCSECNMODE:
                if ((error = priv_check_cred(kauth_cred_get(),
                    PRIV_NET_INTERFACE_CONTROL, 0)) != 0)
                        return (error);
                if (ifr->ifr_ecn_mode == IFRTYPE_ECN_DEFAULT) {
                        ifp->if_eflags &= ~(IFEF_ECN_ENABLE|IFEF_ECN_DISABLE);
                } else if (ifr->ifr_ecn_mode == IFRTYPE_ECN_ENABLE) {
                        ifp->if_eflags |= IFEF_ECN_ENABLE;
                        ifp->if_eflags &= ~IFEF_ECN_DISABLE;
                } else if (ifr->ifr_ecn_mode == IFRTYPE_ECN_DISABLE) {
                        ifp->if_eflags |= IFEF_ECN_DISABLE;
                        ifp->if_eflags &= ~IFEF_ECN_ENABLE;
                } else
                        error = EINVAL;
                break;
        case SIOCSIFTIMESTAMPENABLE:
        case SIOCSIFTIMESTAMPDISABLE:
                error = proc_suser(p);
                if (error != 0)
                        break;

                ifnet_lock_exclusive(ifp);
                if ((cmd == SIOCSIFTIMESTAMPENABLE &&
                    (ifp->if_xflags & IFXF_TIMESTAMP_ENABLED) != 0) ||
                    (cmd == SIOCSIFTIMESTAMPDISABLE &&
                    (ifp->if_xflags & IFXF_TIMESTAMP_ENABLED) == 0)) {
                        ifnet_lock_done(ifp);
                        break;
                }
                if (cmd == SIOCSIFTIMESTAMPENABLE)
                        ifp->if_xflags |= IFXF_TIMESTAMP_ENABLED;
                else
                        ifp->if_xflags &= ~IFXF_TIMESTAMP_ENABLED;
                ifnet_lock_done(ifp);
                /*
                 * Pass the setting to the interface if it supports either
                 * software or hardware time stamping
                 */
                if (ifp->if_capabilities & (IFCAP_HW_TIMESTAMP |
                    IFCAP_SW_TIMESTAMP)) {
                        error = ifnet_ioctl(ifp, SOCK_DOM(so), cmd,
                            (caddr_t)ifr);
                }
                break;
        case SIOCGIFTIMESTAMPENABLED: {
                if ((ifp->if_xflags & IFXF_TIMESTAMP_ENABLED) != 0)
                        ifr->ifr_intval = 1;
                else
                        ifr->ifr_intval = 0;
                break;
        }
        case SIOCSQOSMARKINGMODE:
                if ((error = priv_check_cred(kauth_cred_get(),
                    PRIV_NET_INTERFACE_CONTROL, 0)) != 0)
                        return (error);
                error = if_set_qosmarking_mode(ifp, ifr->ifr_qosmarking_mode);
                break;

        case SIOCGQOSMARKINGMODE:
                ifr->ifr_qosmarking_mode = ifp->if_qosmarking_mode;
                break;

        case SIOCSQOSMARKINGENABLED:
                if ((error = priv_check_cred(kauth_cred_get(),
                    PRIV_NET_INTERFACE_CONTROL, 0)) != 0)
                        return (error);
                if (ifr->ifr_qosmarking_enabled != 0)
                        ifp->if_eflags |= IFEF_QOSMARKING_ENABLED;
                else
                        ifp->if_eflags &= ~IFEF_QOSMARKING_ENABLED;
                break;

        case SIOCGQOSMARKINGENABLED:
                ifr->ifr_qosmarking_enabled =
                        (ifp->if_eflags & IFEF_QOSMARKING_ENABLED) ? 1 : 0;
                break;

        case SIOCSIFDISABLEOUTPUT:
#if (DEBUG || DEVELOPMENT)
                if (ifr->ifr_disable_output == 1) {
                        error = ifnet_disable_output(ifp);
                } else if (ifr->ifr_disable_output == 0) {
                        error = ifnet_enable_output(ifp);
                } else {
                        error = EINVAL;
                }
#else
                error = EINVAL;
#endif /* (DEBUG || DEVELOPMENT) */
                break;
        case SIOCSIFLOWINTERNET:
                if ((error = priv_check_cred(kauth_cred_get(),
                    PRIV_NET_INTERFACE_CONTROL, 0)) != 0)
                        return (error);

                ifnet_lock_exclusive(ifp);
                if (ifr->ifr_low_internet & IFRTYPE_LOW_INTERNET_ENABLE_UL)
                        ifp->if_xflags |= IFXF_LOW_INTERNET_UL;
                else
                        ifp->if_xflags &= ~(IFXF_LOW_INTERNET_UL);
                if (ifr->ifr_low_internet & IFRTYPE_LOW_INTERNET_ENABLE_DL)
                        ifp->if_xflags |= IFXF_LOW_INTERNET_DL;
                else
                        ifp->if_xflags &= ~(IFXF_LOW_INTERNET_DL);
                ifnet_lock_done(ifp);
                break;
        case SIOCGIFLOWINTERNET:
                ifnet_lock_shared(ifp);
                ifr->ifr_low_internet = 0;
                if (ifp->if_xflags & IFXF_LOW_INTERNET_UL)
                        ifr->ifr_low_internet |=
                            IFRTYPE_LOW_INTERNET_ENABLE_UL;
                if (ifp->if_xflags & IFXF_LOW_INTERNET_DL)
                        ifr->ifr_low_internet |=
                            IFRTYPE_LOW_INTERNET_ENABLE_DL;
                ifnet_lock_done(ifp);
                break;
        default:
                VERIFY(0);
                /* NOTREACHED */
        }

        return (error);
}

int
ifioctllocked(struct socket *so, u_long cmd, caddr_t data, struct proc *p)
{
        int error;

        socket_unlock(so, 0);
        error = ifioctl(so, cmd, data, p);
        socket_lock(so, 0);
        return (error);
}

/*
 * Set/clear promiscuous mode on interface ifp based on the truth value
 * of pswitch.  The calls are reference counted so that only the first
 * "on" request actually has an effect, as does the final "off" request.
 * Results are undefined if the "off" and "on" requests are not matched.
 */
errno_t
ifnet_set_promiscuous(
        ifnet_t ifp,
        int pswitch)
{
        int error = 0;
        int oldflags = 0;
        int newflags = 0;

        ifnet_lock_exclusive(ifp);
        oldflags = ifp->if_flags;
        ifp->if_pcount += pswitch ? 1 : -1;

        if (ifp->if_pcount > 0)
                ifp->if_flags |= IFF_PROMISC;
        else
                ifp->if_flags &= ~IFF_PROMISC;

        newflags = ifp->if_flags;
        ifnet_lock_done(ifp);

        if (newflags != oldflags && (newflags & IFF_UP) != 0) {
                error = ifnet_ioctl(ifp, 0, SIOCSIFFLAGS, NULL);
                if (error == 0) {
                        rt_ifmsg(ifp);
                } else {
                        ifnet_lock_exclusive(ifp);
                        // revert the flags
                        ifp->if_pcount -= pswitch ? 1 : -1;
                        if (ifp->if_pcount > 0)
                            ifp->if_flags |= IFF_PROMISC;
                        else
                            ifp->if_flags &= ~IFF_PROMISC;
                        ifnet_lock_done(ifp);
                }
        }

        if (newflags != oldflags) {
                log(LOG_INFO, "%s: promiscuous mode %s%s\n",
                    if_name(ifp),
                    (newflags & IFF_PROMISC) != 0 ? "enable" : "disable",
                    error != 0 ? " failed" : " succeeded");
        }
        return (error);
}

/*
 * Return interface configuration
 * of system.  List may be used
 * in later ioctl's (above) to get
 * other information.
 */
/*ARGSUSED*/
static int
ifconf(u_long cmd, user_addr_t ifrp, int *ret_space)
{
        struct ifnet *ifp = NULL;
        struct ifaddr *ifa;
        struct ifreq ifr;
        int error = 0;
        size_t space;
        net_thread_marks_t marks;

        marks = net_thread_marks_push(NET_THREAD_CKREQ_LLADDR);

        /*
         * Zero the ifr buffer to make sure we don't
         * disclose the contents of the stack.
         */
        bzero(&ifr, sizeof (struct ifreq));

        space = *ret_space;
        ifnet_head_lock_shared();
        for (ifp = ifnet_head.tqh_first; space > sizeof (ifr) &&
            ifp; ifp = ifp->if_link.tqe_next) {
                char workbuf[64];
                size_t ifnlen, addrs;

                ifnlen = snprintf(workbuf, sizeof (workbuf),
                    "%s", if_name(ifp));
                if (ifnlen + 1 > sizeof (ifr.ifr_name)) {
                        error = ENAMETOOLONG;
                        break;
                } else {
                        strlcpy(ifr.ifr_name, workbuf, IFNAMSIZ);
                }

                ifnet_lock_shared(ifp);

                addrs = 0;
                ifa = ifp->if_addrhead.tqh_first;
                for (; space > sizeof (ifr) && ifa;
                    ifa = ifa->ifa_link.tqe_next) {
                        struct sockaddr *sa;
                        union {
                                struct sockaddr sa;
                                struct sockaddr_dl sdl;
                                uint8_t buf[SOCK_MAXADDRLEN + 1];
                        } u;

                        /*
                         * Make sure to accomodate the largest possible
                         * size of SA(if_lladdr)->sa_len.
                         */
                        _CASSERT(sizeof (u) == (SOCK_MAXADDRLEN + 1));

                        IFA_LOCK(ifa);
                        sa = ifa->ifa_addr;
                        addrs++;

                        if (ifa == ifp->if_lladdr) {
                                VERIFY(sa->sa_family == AF_LINK);
                                bcopy(sa, &u, sa->sa_len);
                                IFA_UNLOCK(ifa);
                                ifnet_guarded_lladdr_copy_bytes(ifp,
                                    LLADDR(&u.sdl), u.sdl.sdl_alen);
                                IFA_LOCK(ifa);
                                sa = &u.sa;
                        }

                        if (cmd == OSIOCGIFCONF32 || cmd == OSIOCGIFCONF64) {
                                struct osockaddr *osa =
                                    (struct osockaddr *)(void *)&ifr.ifr_addr;
                                ifr.ifr_addr = *sa;
                                osa->sa_family = sa->sa_family;
                                error = copyout((caddr_t)&ifr, ifrp,
                                    sizeof (ifr));
                                ifrp += sizeof (struct ifreq);
                        } else if (sa->sa_len <= sizeof (*sa)) {
                                ifr.ifr_addr = *sa;
                                error = copyout((caddr_t)&ifr, ifrp,
                                    sizeof (ifr));
                                ifrp += sizeof (struct ifreq);
                        } else {
                                if (space <
                                    sizeof (ifr) + sa->sa_len - sizeof (*sa)) {
                                        IFA_UNLOCK(ifa);
                                        break;
                                }
                                space -= sa->sa_len - sizeof (*sa);
                                error = copyout((caddr_t)&ifr, ifrp,
                                    sizeof (ifr.ifr_name));
                                if (error == 0) {
                                        error = copyout((caddr_t)sa, (ifrp +
                                            offsetof(struct ifreq, ifr_addr)),
                                            sa->sa_len);
                                }
                                ifrp += (sa->sa_len + offsetof(struct ifreq,
                                    ifr_addr));
                        }
                        IFA_UNLOCK(ifa);
                        if (error)
                                break;
                        space -= sizeof (ifr);
                }
                ifnet_lock_done(ifp);

                if (error)
                        break;
                if (!addrs) {
                        bzero((caddr_t)&ifr.ifr_addr, sizeof (ifr.ifr_addr));
                        error = copyout((caddr_t)&ifr, ifrp, sizeof (ifr));
                        if (error)
                                break;
                        space -= sizeof (ifr);
                        ifrp += sizeof (struct ifreq);
                }
        }
        ifnet_head_done();
        *ret_space -= space;
        net_thread_marks_pop(marks);
        return (error);
}

/*
 * Just like if_promisc(), but for all-multicast-reception mode.
 */
int
if_allmulti(struct ifnet *ifp, int onswitch)
{
        int error = 0;
        int     modified = 0;

        ifnet_lock_exclusive(ifp);

        if (onswitch) {
                if (ifp->if_amcount++ == 0) {
                        ifp->if_flags |= IFF_ALLMULTI;
                        modified = 1;
                }
        } else {
                if (ifp->if_amcount > 1) {
                        ifp->if_amcount--;
                } else {
                        ifp->if_amcount = 0;
                        ifp->if_flags &= ~IFF_ALLMULTI;
                        modified = 1;
                }
        }
        ifnet_lock_done(ifp);

        if (modified)
                error = ifnet_ioctl(ifp, 0, SIOCSIFFLAGS, NULL);

        if (error == 0)
                rt_ifmsg(ifp);
        return (error);
}

static struct ifmultiaddr *
ifma_alloc(int how)
{
        struct ifmultiaddr *ifma;

        ifma = (how == M_WAITOK) ? zalloc(ifma_zone) :
            zalloc_noblock(ifma_zone);

        if (ifma != NULL) {
                bzero(ifma, ifma_size);
                lck_mtx_init(&ifma->ifma_lock, ifa_mtx_grp, ifa_mtx_attr);
                ifma->ifma_debug |= IFD_ALLOC;
                if (ifma_debug != 0) {
                        ifma->ifma_debug |= IFD_DEBUG;
                        ifma->ifma_trace = ifma_trace;
                }
        }
        return (ifma);
}

static void
ifma_free(struct ifmultiaddr *ifma)
{
        IFMA_LOCK(ifma);

        if (ifma->ifma_protospec != NULL) {
                panic("%s: Protospec not NULL for ifma=%p", __func__, ifma);
                /* NOTREACHED */
        } else if ((ifma->ifma_flags & IFMAF_ANONYMOUS) ||
            ifma->ifma_anoncnt != 0) {
                panic("%s: Freeing ifma=%p with outstanding anon req",
                    __func__, ifma);
                /* NOTREACHED */
        } else if (ifma->ifma_debug & IFD_ATTACHED) {
                panic("%s: ifma=%p attached to ifma_ifp=%p is being freed",
                    __func__, ifma, ifma->ifma_ifp);
                /* NOTREACHED */
        } else if (!(ifma->ifma_debug & IFD_ALLOC)) {
                panic("%s: ifma %p cannot be freed", __func__, ifma);
                /* NOTREACHED */
        } else if (ifma->ifma_refcount != 0) {
                panic("%s: non-zero refcount ifma=%p", __func__, ifma);
                /* NOTREACHED */
        } else if (ifma->ifma_reqcnt != 0) {
                panic("%s: non-zero reqcnt ifma=%p", __func__, ifma);
                /* NOTREACHED */
        } else if (ifma->ifma_ifp != NULL) {
                panic("%s: non-NULL ifma_ifp=%p for ifma=%p", __func__,
                    ifma->ifma_ifp, ifma);
                /* NOTREACHED */
        } else if (ifma->ifma_ll != NULL) {
                panic("%s: non-NULL ifma_ll=%p for ifma=%p", __func__,
                    ifma->ifma_ll, ifma);
                /* NOTREACHED */
        }
        ifma->ifma_debug &= ~IFD_ALLOC;
        if ((ifma->ifma_debug & (IFD_DEBUG | IFD_TRASHED)) ==
            (IFD_DEBUG | IFD_TRASHED)) {
                lck_mtx_lock(&ifma_trash_lock);
                TAILQ_REMOVE(&ifma_trash_head, (struct ifmultiaddr_dbg *)ifma,
                    ifma_trash_link);
                lck_mtx_unlock(&ifma_trash_lock);
                ifma->ifma_debug &= ~IFD_TRASHED;
        }
        IFMA_UNLOCK(ifma);

        if (ifma->ifma_addr != NULL) {
                FREE(ifma->ifma_addr, M_IFADDR);
                ifma->ifma_addr = NULL;
        }
        lck_mtx_destroy(&ifma->ifma_lock, ifa_mtx_grp);
        zfree(ifma_zone, ifma);
}

static void
ifma_trace(struct ifmultiaddr *ifma, int refhold)
{
        struct ifmultiaddr_dbg *ifma_dbg = (struct ifmultiaddr_dbg *)ifma;
        ctrace_t *tr;
        u_int32_t idx;
        u_int16_t *cnt;

        if (!(ifma->ifma_debug & IFD_DEBUG)) {
                panic("%s: ifma %p has no debug structure", __func__, ifma);
                /* NOTREACHED */
        }
        if (refhold) {
                cnt = &ifma_dbg->ifma_refhold_cnt;
                tr = ifma_dbg->ifma_refhold;
        } else {
                cnt = &ifma_dbg->ifma_refrele_cnt;
                tr = ifma_dbg->ifma_refrele;
        }

        idx = atomic_add_16_ov(cnt, 1) % IFMA_TRACE_HIST_SIZE;
        ctrace_record(&tr[idx]);
}

void
ifma_addref(struct ifmultiaddr *ifma, int locked)
{
        if (!locked)
                IFMA_LOCK(ifma);
        else
                IFMA_LOCK_ASSERT_HELD(ifma);

        if (++ifma->ifma_refcount == 0) {
                panic("%s: ifma=%p wraparound refcnt", __func__, ifma);
                /* NOTREACHED */
        } else if (ifma->ifma_trace != NULL) {
                (*ifma->ifma_trace)(ifma, TRUE);
        }
        if (!locked)
                IFMA_UNLOCK(ifma);
}

void
ifma_remref(struct ifmultiaddr *ifma)
{
        struct ifmultiaddr *ll;

        IFMA_LOCK(ifma);

        if (ifma->ifma_refcount == 0) {
                panic("%s: ifma=%p negative refcnt", __func__, ifma);
                /* NOTREACHED */
        } else if (ifma->ifma_trace != NULL) {
                (*ifma->ifma_trace)(ifma, FALSE);
        }

        --ifma->ifma_refcount;
        if (ifma->ifma_refcount > 0) {
                IFMA_UNLOCK(ifma);
                return;
        }

        ll = ifma->ifma_ll;
        ifma->ifma_ifp = NULL;
        ifma->ifma_ll = NULL;
        IFMA_UNLOCK(ifma);
        ifma_free(ifma);        /* deallocate it */

        if (ll != NULL)
                IFMA_REMREF(ll);
}

static void
if_attach_ifma(struct ifnet *ifp, struct ifmultiaddr *ifma, int anon)
{
        ifnet_lock_assert(ifp, IFNET_LCK_ASSERT_EXCLUSIVE);
        IFMA_LOCK_ASSERT_HELD(ifma);

        if (ifma->ifma_ifp != ifp) {
                panic("%s: Mismatch ifma_ifp=%p != ifp=%p", __func__,
                    ifma->ifma_ifp, ifp);
                /* NOTREACHED */
        } else if (ifma->ifma_debug & IFD_ATTACHED) {
                panic("%s: Attempt to attach an already attached ifma=%p",
                    __func__, ifma);
                /* NOTREACHED */
        } else if (anon && (ifma->ifma_flags & IFMAF_ANONYMOUS)) {
                panic("%s: ifma=%p unexpected IFMAF_ANONYMOUS", __func__, ifma);
                /* NOTREACHED */
        } else if (ifma->ifma_debug & IFD_TRASHED) {
                panic("%s: Attempt to reattach a detached ifma=%p",
                    __func__, ifma);
                /* NOTREACHED */
        }

        ifma->ifma_reqcnt++;
        VERIFY(ifma->ifma_reqcnt == 1);
        IFMA_ADDREF_LOCKED(ifma);
        ifma->ifma_debug |= IFD_ATTACHED;
        if (anon) {
                ifma->ifma_anoncnt++;
                VERIFY(ifma->ifma_anoncnt == 1);
                ifma->ifma_flags |= IFMAF_ANONYMOUS;
        }

        LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
}

static int
if_detach_ifma(struct ifnet *ifp, struct ifmultiaddr *ifma, int anon)
{
        ifnet_lock_assert(ifp, IFNET_LCK_ASSERT_EXCLUSIVE);
        IFMA_LOCK_ASSERT_HELD(ifma);

        if (ifma->ifma_reqcnt == 0) {
                panic("%s: ifma=%p negative reqcnt", __func__, ifma);
                /* NOTREACHED */
        } else if (anon && !(ifma->ifma_flags & IFMAF_ANONYMOUS)) {
                panic("%s: ifma=%p missing IFMAF_ANONYMOUS", __func__, ifma);
                /* NOTREACHED */
        } else if (anon && ifma->ifma_anoncnt == 0) {
                panic("%s: ifma=%p negative anonreqcnt", __func__, ifma);
                /* NOTREACHED */
        } else if (ifma->ifma_ifp != ifp) {
                panic("%s: Mismatch ifma_ifp=%p, ifp=%p", __func__,
                    ifma->ifma_ifp, ifp);
                /* NOTREACHED */
        }

        if (anon) {
                --ifma->ifma_anoncnt;
                if (ifma->ifma_anoncnt > 0)
                        return (0);
                ifma->ifma_flags &= ~IFMAF_ANONYMOUS;
        }

        --ifma->ifma_reqcnt;
        if (ifma->ifma_reqcnt > 0)
                return (0);

        if (ifma->ifma_protospec != NULL) {
                panic("%s: Protospec not NULL for ifma=%p", __func__, ifma);
                /* NOTREACHED */
        } else if ((ifma->ifma_flags & IFMAF_ANONYMOUS) ||
            ifma->ifma_anoncnt != 0) {
                panic("%s: Detaching ifma=%p with outstanding anon req",
                    __func__, ifma);
                /* NOTREACHED */
        } else if (!(ifma->ifma_debug & IFD_ATTACHED)) {
                panic("%s: Attempt to detach an unattached address ifma=%p",
                    __func__, ifma);
                /* NOTREACHED */
        } else if (ifma->ifma_debug & IFD_TRASHED) {
                panic("%s: ifma %p is already in trash list", __func__, ifma);
                /* NOTREACHED */
        }

        /*
         * NOTE: Caller calls IFMA_REMREF
         */
        ifma->ifma_debug &= ~IFD_ATTACHED;
        LIST_REMOVE(ifma, ifma_link);
        if (LIST_EMPTY(&ifp->if_multiaddrs))
                ifp->if_updatemcasts = 0;

        if (ifma->ifma_debug & IFD_DEBUG) {
                /* Become a regular mutex, just in case */
                IFMA_CONVERT_LOCK(ifma);
                lck_mtx_lock(&ifma_trash_lock);
                TAILQ_INSERT_TAIL(&ifma_trash_head,
                    (struct ifmultiaddr_dbg *)ifma, ifma_trash_link);
                lck_mtx_unlock(&ifma_trash_lock);
                ifma->ifma_debug |= IFD_TRASHED;
        }

        return (1);
}

/*
 * Find an ifmultiaddr that matches a socket address on an interface.
 *
 * Caller is responsible for holding the ifnet_lock while calling
 * this function.
 */
static int
if_addmulti_doesexist(struct ifnet *ifp, const struct sockaddr *sa,
    struct ifmultiaddr **retifma, int anon)
{
        struct ifmultiaddr *ifma;

        for (ifma = LIST_FIRST(&ifp->if_multiaddrs); ifma != NULL;
            ifma = LIST_NEXT(ifma, ifma_link)) {
                IFMA_LOCK_SPIN(ifma);
                if (!ifa_equal(sa, ifma->ifma_addr)) {
                        IFMA_UNLOCK(ifma);
                        continue;
                }
                if (anon) {
                        VERIFY(!(ifma->ifma_flags & IFMAF_ANONYMOUS) ||
                            ifma->ifma_anoncnt != 0);
                        VERIFY((ifma->ifma_flags & IFMAF_ANONYMOUS) ||
                            ifma->ifma_anoncnt == 0);
                        ifma->ifma_anoncnt++;
                        if (!(ifma->ifma_flags & IFMAF_ANONYMOUS)) {
                                VERIFY(ifma->ifma_anoncnt == 1);
                                ifma->ifma_flags |= IFMAF_ANONYMOUS;
                        }
                }
                if (!anon || ifma->ifma_anoncnt == 1) {
                        ifma->ifma_reqcnt++;
                        VERIFY(ifma->ifma_reqcnt > 1);
                }
                if (retifma != NULL) {
                        *retifma = ifma;
                        IFMA_ADDREF_LOCKED(ifma);
                }
                IFMA_UNLOCK(ifma);
                return (0);
        }
        return (ENOENT);
}

/*
 * Radar 3642395, make sure all multicasts are in a standard format.
 */
static struct sockaddr *
copy_and_normalize(const struct sockaddr *original)
{
        int                     alen = 0;
        const u_char            *aptr = NULL;
        struct sockaddr         *copy = NULL;
        struct sockaddr_dl      *sdl_new = NULL;
        int                     len = 0;

        if (original->sa_family != AF_LINK &&
            original->sa_family != AF_UNSPEC) {
                /* Just make a copy */
                MALLOC(copy, struct sockaddr *, original->sa_len,
                    M_IFADDR, M_WAITOK);
                if (copy != NULL)
                        bcopy(original, copy, original->sa_len);
                return (copy);
        }

        switch (original->sa_family) {
                case AF_LINK: {
                        const struct sockaddr_dl *sdl_original =
                            (struct sockaddr_dl *)(uintptr_t)(size_t)original;

                        if (sdl_original->sdl_nlen + sdl_original->sdl_alen +
                            sdl_original->sdl_slen +
                            offsetof(struct sockaddr_dl, sdl_data) >
                            sdl_original->sdl_len)
                                return (NULL);

                        alen = sdl_original->sdl_alen;
                        aptr = CONST_LLADDR(sdl_original);
                }
                break;

                case AF_UNSPEC: {
                        if (original->sa_len < ETHER_ADDR_LEN +
                            offsetof(struct sockaddr, sa_data)) {
                                return (NULL);
                        }

                        alen = ETHER_ADDR_LEN;
                        aptr = (const u_char *)original->sa_data;
                }
                break;
        }

        if (alen == 0 || aptr == NULL)
                return (NULL);

        len = alen + offsetof(struct sockaddr_dl, sdl_data);
        MALLOC(sdl_new, struct sockaddr_dl *, len, M_IFADDR, M_WAITOK);

        if (sdl_new != NULL) {
                bzero(sdl_new, len);
                sdl_new->sdl_len = len;
                sdl_new->sdl_family = AF_LINK;
                sdl_new->sdl_alen = alen;
                bcopy(aptr, LLADDR(sdl_new), alen);
        }

        return ((struct sockaddr *)sdl_new);
}

/*
 * Network-layer protocol domains which hold references to the underlying
 * link-layer record must use this routine.
 */
int
if_addmulti(struct ifnet *ifp, const struct sockaddr *sa,
    struct ifmultiaddr **retifma)
{
        return (if_addmulti_common(ifp, sa, retifma, 0));
}

/*
 * Anything other than network-layer protocol domains which hold references
 * to the underlying link-layer record must use this routine: SIOCADDMULTI
 * ioctl, ifnet_add_multicast(), if_bond.
 */
int
if_addmulti_anon(struct ifnet *ifp, const struct sockaddr *sa,
    struct ifmultiaddr **retifma)
{
        return (if_addmulti_common(ifp, sa, retifma, 1));
}

/*
 * Register an additional multicast address with a network interface.
 *
 * - If the address is already present, bump the reference count on the
 *   address and return.
 * - If the address is not link-layer, look up a link layer address.
 * - Allocate address structures for one or both addresses, and attach to the
 *   multicast address list on the interface.  If automatically adding a link
 *   layer address, the protocol address will own a reference to the link
 *   layer address, to be freed when it is freed.
 * - Notify the network device driver of an addition to the multicast address
 *   list.
 *
 * 'sa' points to caller-owned memory with the desired multicast address.
 *
 * 'retifma' will be used to return a pointer to the resulting multicast
 * address reference, if desired.
 *
 * 'anon' indicates a link-layer address with no protocol address reference
 * made to it.  Anything other than network-layer protocol domain requests
 * are considered as anonymous.
 */
static int
if_addmulti_common(struct ifnet *ifp, const struct sockaddr *sa,
    struct ifmultiaddr **retifma, int anon)
{
        struct sockaddr_storage storage;
        struct sockaddr *llsa = NULL;
        struct sockaddr *dupsa = NULL;
        int error = 0, ll_firstref = 0, lladdr;
        struct ifmultiaddr *ifma = NULL;
        struct ifmultiaddr *llifma = NULL;

        /* Only AF_UNSPEC/AF_LINK is allowed for an "anonymous" address */
        VERIFY(!anon || sa->sa_family == AF_UNSPEC ||
            sa->sa_family == AF_LINK);

        /* If sa is a AF_LINK or AF_UNSPEC, duplicate and normalize it */
        if (sa->sa_family == AF_LINK || sa->sa_family == AF_UNSPEC) {
                dupsa = copy_and_normalize(sa);
                if (dupsa == NULL) {
                        error = ENOMEM;
                        goto cleanup;
                }
                sa = dupsa;
        }

        ifnet_lock_exclusive(ifp);
        if (!(ifp->if_flags & IFF_MULTICAST)) {
                error = EADDRNOTAVAIL;
                ifnet_lock_done(ifp);
                goto cleanup;
        }

        /* If the address is already present, return a new reference to it */
        error = if_addmulti_doesexist(ifp, sa, retifma, anon);
        ifnet_lock_done(ifp);
        if (error == 0)
                goto cleanup;

        /*
         * The address isn't already present; give the link layer a chance
         * to accept/reject it, and also find out which AF_LINK address this
         * maps to, if it isn't one already.
         */
        error = dlil_resolve_multi(ifp, sa, (struct sockaddr *)&storage,
            sizeof (storage));
        if (error == 0 && storage.ss_len != 0) {
                llsa = copy_and_normalize((struct sockaddr *)&storage);
                if (llsa == NULL) {
                        error = ENOMEM;
                        goto cleanup;
                }

                llifma = ifma_alloc(M_WAITOK);
                if (llifma == NULL) {
                        error = ENOMEM;
                        goto cleanup;
                }
        }

        /* to be similar to FreeBSD */
        if (error == EOPNOTSUPP)
                error = 0;
        else if (error != 0)
                goto cleanup;

        /* Allocate while we aren't holding any locks */
        if (dupsa == NULL) {
                dupsa = copy_and_normalize(sa);
                if (dupsa == NULL) {
                        error = ENOMEM;
                        goto cleanup;
                }
        }
        ifma = ifma_alloc(M_WAITOK);
        if (ifma == NULL) {
                error = ENOMEM;
                goto cleanup;
        }

        ifnet_lock_exclusive(ifp);
        /*
         * Check again for the matching multicast.
         */
        error = if_addmulti_doesexist(ifp, sa, retifma, anon);
        if (error == 0) {
                ifnet_lock_done(ifp);
                goto cleanup;
        }

        if (llifma != NULL) {
                VERIFY(!anon);  /* must not get here if "anonymous" */
                if (if_addmulti_doesexist(ifp, llsa, &ifma->ifma_ll, 0) == 0) {
                        FREE(llsa, M_IFADDR);
                        llsa = NULL;
                        ifma_free(llifma);
                        llifma = NULL;
                        VERIFY(ifma->ifma_ll->ifma_ifp == ifp);
                } else {
                        ll_firstref = 1;
                        llifma->ifma_addr = llsa;
                        llifma->ifma_ifp = ifp;
                        IFMA_LOCK(llifma);
                        if_attach_ifma(ifp, llifma, 0);
                        /* add extra refcnt for ifma */
                        IFMA_ADDREF_LOCKED(llifma);
                        IFMA_UNLOCK(llifma);
                        ifma->ifma_ll = llifma;
                }
        }

        /* "anonymous" request should not result in network address */
        VERIFY(!anon || ifma->ifma_ll == NULL);

        ifma->ifma_addr = dupsa;
        ifma->ifma_ifp = ifp;
        IFMA_LOCK(ifma);
        if_attach_ifma(ifp, ifma, anon);
        IFMA_ADDREF_LOCKED(ifma);               /* for this routine */
        if (retifma != NULL) {
                *retifma = ifma;
                IFMA_ADDREF_LOCKED(*retifma);   /* for caller */
        }
        lladdr = (ifma->ifma_addr->sa_family == AF_UNSPEC ||
            ifma->ifma_addr->sa_family == AF_LINK);
        IFMA_UNLOCK(ifma);
        ifnet_lock_done(ifp);

        rt_newmaddrmsg(RTM_NEWMADDR, ifma);
        IFMA_REMREF(ifma);                      /* for this routine */

        /*
         * We are certain we have added something, so call down to the
         * interface to let them know about it.  Do this only for newly-
         * added AF_LINK/AF_UNSPEC address in the if_multiaddrs set.
         */
        if (lladdr || ll_firstref)
                (void) ifnet_ioctl(ifp, 0, SIOCADDMULTI, NULL);

        if (ifp->if_updatemcasts > 0)
                ifp->if_updatemcasts = 0;

        return (0);

cleanup:
        if (ifma != NULL)
                ifma_free(ifma);
        if (dupsa != NULL)
                FREE(dupsa, M_IFADDR);
        if (llifma != NULL)
                ifma_free(llifma);
        if (llsa != NULL)
                FREE(llsa, M_IFADDR);

        return (error);
}

/*
 * Delete a multicast group membership by network-layer group address.
 * This routine is deprecated.
 */
int
if_delmulti(struct ifnet *ifp, const struct sockaddr *sa)
{
        return (if_delmulti_common(NULL, ifp, sa, 0));
}

/*
 * Delete a multicast group membership by group membership pointer.
 * Network-layer protocol domains must use this routine.
 */
int
if_delmulti_ifma(struct ifmultiaddr *ifma)
{
        return (if_delmulti_common(ifma, NULL, NULL, 0));
}

/*
 * Anything other than network-layer protocol domains which hold references
 * to the underlying link-layer record must use this routine: SIOCDELMULTI
 * ioctl, ifnet_remove_multicast(), if_bond.
 */
int
if_delmulti_anon(struct ifnet *ifp, const struct sockaddr *sa)
{
        return (if_delmulti_common(NULL, ifp, sa, 1));
}

/*
 * Delete a multicast group membership by network-layer group address.
 *
 * Returns ENOENT if the entry could not be found.
 */
static int
if_delmulti_common(struct ifmultiaddr *ifma, struct ifnet *ifp,
    const struct sockaddr *sa, int anon)
{
        struct sockaddr         *dupsa = NULL;
        int                     lastref, ll_lastref = 0, lladdr;
        struct ifmultiaddr      *ll = NULL;

        /* sanity check for callers */
        VERIFY(ifma != NULL || (ifp != NULL && sa != NULL));

        if (ifma != NULL)
                ifp = ifma->ifma_ifp;

        if (sa != NULL &&
            (sa->sa_family == AF_LINK || sa->sa_family == AF_UNSPEC)) {
                dupsa = copy_and_normalize(sa);
                if (dupsa == NULL)
                        return (ENOMEM);
                sa = dupsa;
        }

        ifnet_lock_exclusive(ifp);
        if (ifma == NULL) {
                for (ifma = LIST_FIRST(&ifp->if_multiaddrs); ifma != NULL;
                    ifma = LIST_NEXT(ifma, ifma_link)) {
                        IFMA_LOCK(ifma);
                        if (!ifa_equal(sa, ifma->ifma_addr) ||
                            (anon && !(ifma->ifma_flags & IFMAF_ANONYMOUS))) {
                                VERIFY(!(ifma->ifma_flags & IFMAF_ANONYMOUS) ||
                                    ifma->ifma_anoncnt != 0);
                                IFMA_UNLOCK(ifma);
                                continue;
                        }
                        /* found; keep it locked */
                        break;
                }
                if (ifma == NULL) {
                        if (dupsa != NULL)
                                FREE(dupsa, M_IFADDR);
                        ifnet_lock_done(ifp);
                        return (ENOENT);
                }
        } else {
                IFMA_LOCK(ifma);
        }
        IFMA_LOCK_ASSERT_HELD(ifma);
        IFMA_ADDREF_LOCKED(ifma);       /* for this routine */
        lastref = if_detach_ifma(ifp, ifma, anon);
        VERIFY(!lastref || (!(ifma->ifma_debug & IFD_ATTACHED) &&
            ifma->ifma_reqcnt == 0));
        VERIFY(!anon || ifma->ifma_ll == NULL);
        ll = ifma->ifma_ll;
        lladdr = (ifma->ifma_addr->sa_family == AF_UNSPEC ||
            ifma->ifma_addr->sa_family == AF_LINK);
        IFMA_UNLOCK(ifma);
        if (lastref && ll != NULL) {
                IFMA_LOCK(ll);
                ll_lastref = if_detach_ifma(ifp, ll, 0);
                IFMA_UNLOCK(ll);
        }
        ifnet_lock_done(ifp);

        if (lastref)
                rt_newmaddrmsg(RTM_DELMADDR, ifma);

        if ((ll == NULL && lastref && lladdr) || ll_lastref) {
                /*
                 * Make sure the interface driver is notified in the
                 * case of a link layer mcast group being left.  Do
                 * this only for a AF_LINK/AF_UNSPEC address that has
                 * been removed from the if_multiaddrs set.
                 */
                ifnet_ioctl(ifp, 0, SIOCDELMULTI, NULL);
        }

        if (lastref)
                IFMA_REMREF(ifma);      /* for if_multiaddrs list */
        if (ll_lastref)
                IFMA_REMREF(ll);        /* for if_multiaddrs list */

        IFMA_REMREF(ifma);              /* for this routine */
        if (dupsa != NULL)
                FREE(dupsa, M_IFADDR);

        return (0);
}

/*
 * Shutdown all network activity.  Used boot() when halting
 * system.
 */
int
if_down_all(void)
{
        struct ifnet **ifp;
        u_int32_t       count;
        u_int32_t       i;

        if (ifnet_list_get_all(IFNET_FAMILY_ANY, &ifp, &count) == 0) {
                for (i = 0; i < count; i++) {
                        if_down(ifp[i]);
                        dlil_proto_unplumb_all(ifp[i]);
                }
                ifnet_list_free(ifp);
        }

        return (0);
}

/*
 * Delete Routes for a Network Interface
 *
 * Called for each routing entry via the rnh->rnh_walktree() call above
 * to delete all route entries referencing a detaching network interface.
 *
 * Arguments:
 *      rn      pointer to node in the routing table
 *      arg     argument passed to rnh->rnh_walktree() - detaching interface
 *
 * Returns:
 *      0       successful
 *      errno   failed - reason indicated
 *
 */
static int
if_rtdel(struct radix_node *rn, void *arg)
{
        struct rtentry  *rt = (struct rtentry *)rn;
        struct ifnet    *ifp = arg;
        int             err;

        if (rt == NULL)
                return (0);
        /*
         * Checking against RTF_UP protects against walktree
         * recursion problems with cloned routes.
         */
        RT_LOCK(rt);
        if (rt->rt_ifp == ifp && (rt->rt_flags & RTF_UP)) {
                /*
                 * Safe to drop rt_lock and use rt_key, rt_gateway,
                 * since holding rnh_lock here prevents another thread
                 * from calling rt_setgate() on this route.
                 */
                RT_UNLOCK(rt);
                err = rtrequest_locked(RTM_DELETE, rt_key(rt), rt->rt_gateway,
                    rt_mask(rt), rt->rt_flags, NULL);
                if (err) {
                        log(LOG_WARNING, "if_rtdel: error %d\n", err);
                }
        } else {
                RT_UNLOCK(rt);
        }
        return (0);
}

/*
 * Removes routing table reference to a given interface
 * for a given protocol family
 */
void
if_rtproto_del(struct ifnet *ifp, int protocol)
{
        struct radix_node_head  *rnh;

        if ((protocol <= AF_MAX) && (protocol >= 0) &&
                ((rnh = rt_tables[protocol]) != NULL) && (ifp != NULL)) {
                lck_mtx_lock(rnh_lock);
                (void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
                lck_mtx_unlock(rnh_lock);
        }
}

static int
if_rtmtu(struct radix_node *rn, void *arg)
{
        struct rtentry *rt = (struct rtentry *)rn;
        struct ifnet *ifp = arg;

        RT_LOCK(rt);
        if (rt->rt_ifp == ifp) {
                /*
                 * Update the MTU of this entry only if the MTU
                 * has not been locked (RTV_MTU is not set) and
                 * if it was non-zero to begin with.
                 */
                if (!(rt->rt_rmx.rmx_locks & RTV_MTU) && rt->rt_rmx.rmx_mtu)
                        rt->rt_rmx.rmx_mtu = ifp->if_mtu;
        }
        RT_UNLOCK(rt);

        return (0);
}

/*
 * Update the MTU metric of all route entries in all protocol tables
 * associated with a particular interface; this is called when the
 * MTU of that interface has changed.
 */
static void
if_rtmtu_update(struct ifnet *ifp)
{
        struct radix_node_head *rnh;
        int p;

        for (p = 0; p < AF_MAX + 1; p++) {
                if ((rnh = rt_tables[p]) == NULL)
                        continue;

                lck_mtx_lock(rnh_lock);
                (void) rnh->rnh_walktree(rnh, if_rtmtu, ifp);
                lck_mtx_unlock(rnh_lock);
        }
        routegenid_update();
}

__private_extern__ void
if_data_internal_to_if_data(struct ifnet *ifp,
    const struct if_data_internal *if_data_int, struct if_data *if_data)
{
#pragma unused(ifp)
#define COPYFIELD(fld)          if_data->fld = if_data_int->fld
#define COPYFIELD32(fld)        if_data->fld = (u_int32_t)(if_data_int->fld)
/* compiler will cast down to 32-bit */
#define COPYFIELD32_ATOMIC(fld) do {                                    \
        atomic_get_64(if_data->fld,                                     \
            (u_int64_t *)(void *)(uintptr_t)&if_data_int->fld);         \
} while (0)

        COPYFIELD(ifi_type);
        COPYFIELD(ifi_typelen);
        COPYFIELD(ifi_physical);
        COPYFIELD(ifi_addrlen);
        COPYFIELD(ifi_hdrlen);
        COPYFIELD(ifi_recvquota);
        COPYFIELD(ifi_xmitquota);
        if_data->ifi_unused1 = 0;
        COPYFIELD(ifi_mtu);
        COPYFIELD(ifi_metric);
        if (if_data_int->ifi_baudrate & 0xFFFFFFFF00000000LL) {
                if_data->ifi_baudrate = 0xFFFFFFFF;
        } else {
                COPYFIELD32(ifi_baudrate);
        }

        COPYFIELD32_ATOMIC(ifi_ipackets);
        COPYFIELD32_ATOMIC(ifi_ierrors);
        COPYFIELD32_ATOMIC(ifi_opackets);
        COPYFIELD32_ATOMIC(ifi_oerrors);
        COPYFIELD32_ATOMIC(ifi_collisions);
        COPYFIELD32_ATOMIC(ifi_ibytes);
        COPYFIELD32_ATOMIC(ifi_obytes);
        COPYFIELD32_ATOMIC(ifi_imcasts);
        COPYFIELD32_ATOMIC(ifi_omcasts);
        COPYFIELD32_ATOMIC(ifi_iqdrops);
        COPYFIELD32_ATOMIC(ifi_noproto);

        COPYFIELD(ifi_recvtiming);
        COPYFIELD(ifi_xmittiming);

        if_data->ifi_lastchange.tv_sec = if_data_int->ifi_lastchange.tv_sec;
        if_data->ifi_lastchange.tv_usec = if_data_int->ifi_lastchange.tv_usec;

        if_data->ifi_lastchange.tv_sec += boottime_sec();

        if_data->ifi_unused2 = 0;
        COPYFIELD(ifi_hwassist);
        if_data->ifi_reserved1 = 0;
        if_data->ifi_reserved2 = 0;
#undef COPYFIELD32_ATOMIC
#undef COPYFIELD32
#undef COPYFIELD
}

__private_extern__ void
if_data_internal_to_if_data64(struct ifnet *ifp,
    const struct if_data_internal *if_data_int,
    struct if_data64 *if_data64)
{
#pragma unused(ifp)
#define COPYFIELD64(fld)        if_data64->fld = if_data_int->fld
#define COPYFIELD64_ATOMIC(fld) do {                                    \
        atomic_get_64(if_data64->fld,                                   \
            (u_int64_t *)(void *)(uintptr_t)&if_data_int->fld);         \
} while (0)

        COPYFIELD64(ifi_type);
        COPYFIELD64(ifi_typelen);
        COPYFIELD64(ifi_physical);
        COPYFIELD64(ifi_addrlen);
        COPYFIELD64(ifi_hdrlen);
        COPYFIELD64(ifi_recvquota);
        COPYFIELD64(ifi_xmitquota);
        if_data64->ifi_unused1 = 0;
        COPYFIELD64(ifi_mtu);
        COPYFIELD64(ifi_metric);
        COPYFIELD64(ifi_baudrate);

        COPYFIELD64_ATOMIC(ifi_ipackets);
        COPYFIELD64_ATOMIC(ifi_ierrors);
        COPYFIELD64_ATOMIC(ifi_opackets);
        COPYFIELD64_ATOMIC(ifi_oerrors);
        COPYFIELD64_ATOMIC(ifi_collisions);
        COPYFIELD64_ATOMIC(ifi_ibytes);
        COPYFIELD64_ATOMIC(ifi_obytes);
        COPYFIELD64_ATOMIC(ifi_imcasts);
        COPYFIELD64_ATOMIC(ifi_omcasts);
        COPYFIELD64_ATOMIC(ifi_iqdrops);
        COPYFIELD64_ATOMIC(ifi_noproto);

        /*
         * Note these two fields are actually 32 bit, so doing
         * COPYFIELD64_ATOMIC will cause them to be misaligned
         */
        COPYFIELD64(ifi_recvtiming);
        COPYFIELD64(ifi_xmittiming);

        if_data64->ifi_lastchange.tv_sec = if_data_int->ifi_lastchange.tv_sec;
        if_data64->ifi_lastchange.tv_usec = if_data_int->ifi_lastchange.tv_usec;

        if_data64->ifi_lastchange.tv_sec += boottime_sec();

#undef COPYFIELD64
}

__private_extern__ void
if_copy_traffic_class(struct ifnet *ifp,
    struct if_traffic_class *if_tc)
{
#define COPY_IF_TC_FIELD64_ATOMIC(fld) do {                     \
        atomic_get_64(if_tc->fld,                               \
            (u_int64_t *)(void *)(uintptr_t)&ifp->if_tc.fld);   \
} while (0)

        bzero(if_tc, sizeof (*if_tc));
        COPY_IF_TC_FIELD64_ATOMIC(ifi_ibepackets);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_ibebytes);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_obepackets);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_obebytes);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_ibkpackets);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_ibkbytes);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_obkpackets);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_obkbytes);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_ivipackets);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_ivibytes);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_ovipackets);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_ovibytes);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_ivopackets);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_ivobytes);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_ovopackets);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_ovobytes);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_ipvpackets);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_ipvbytes);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_opvpackets);
        COPY_IF_TC_FIELD64_ATOMIC(ifi_opvbytes);

#undef COPY_IF_TC_FIELD64_ATOMIC
}

void
if_copy_data_extended(struct ifnet *ifp, struct if_data_extended *if_de)
{
#define COPY_IF_DE_FIELD64_ATOMIC(fld) do {                     \
        atomic_get_64(if_de->fld,                               \
            (u_int64_t *)(void *)(uintptr_t)&ifp->if_data.fld); \
} while (0)

        bzero(if_de, sizeof (*if_de));
        COPY_IF_DE_FIELD64_ATOMIC(ifi_alignerrs);
        COPY_IF_DE_FIELD64_ATOMIC(ifi_dt_bytes);
        COPY_IF_DE_FIELD64_ATOMIC(ifi_fpackets);
        COPY_IF_DE_FIELD64_ATOMIC(ifi_fbytes);

#undef COPY_IF_DE_FIELD64_ATOMIC
}

void
if_copy_packet_stats(struct ifnet *ifp, struct if_packet_stats *if_ps)
{
#define COPY_IF_PS_TCP_FIELD64_ATOMIC(fld) do {                         \
        atomic_get_64(if_ps->ifi_tcp_##fld,                             \
            (u_int64_t *)(void *)(uintptr_t)&ifp->if_tcp_stat->fld);    \
} while (0)

#define COPY_IF_PS_UDP_FIELD64_ATOMIC(fld) do {                         \
        atomic_get_64(if_ps->ifi_udp_##fld,                             \
            (u_int64_t *)(void *)(uintptr_t)&ifp->if_udp_stat->fld);    \
} while (0)

        COPY_IF_PS_TCP_FIELD64_ATOMIC(badformat);
        COPY_IF_PS_TCP_FIELD64_ATOMIC(unspecv6);
        COPY_IF_PS_TCP_FIELD64_ATOMIC(synfin);
        COPY_IF_PS_TCP_FIELD64_ATOMIC(badformatipsec);
        COPY_IF_PS_TCP_FIELD64_ATOMIC(noconnnolist);
        COPY_IF_PS_TCP_FIELD64_ATOMIC(noconnlist);
        COPY_IF_PS_TCP_FIELD64_ATOMIC(listbadsyn);
        COPY_IF_PS_TCP_FIELD64_ATOMIC(icmp6unreach);
        COPY_IF_PS_TCP_FIELD64_ATOMIC(deprecate6);
        COPY_IF_PS_TCP_FIELD64_ATOMIC(ooopacket);
        COPY_IF_PS_TCP_FIELD64_ATOMIC(rstinsynrcv);
        COPY_IF_PS_TCP_FIELD64_ATOMIC(dospacket);
        COPY_IF_PS_TCP_FIELD64_ATOMIC(cleanup);
        COPY_IF_PS_TCP_FIELD64_ATOMIC(synwindow);

        COPY_IF_PS_UDP_FIELD64_ATOMIC(port_unreach);
        COPY_IF_PS_UDP_FIELD64_ATOMIC(faithprefix);
        COPY_IF_PS_UDP_FIELD64_ATOMIC(port0);
        COPY_IF_PS_UDP_FIELD64_ATOMIC(badlength);
        COPY_IF_PS_UDP_FIELD64_ATOMIC(badchksum);
        COPY_IF_PS_UDP_FIELD64_ATOMIC(badmcast);
        COPY_IF_PS_UDP_FIELD64_ATOMIC(cleanup);
        COPY_IF_PS_UDP_FIELD64_ATOMIC(badipsec);

#undef COPY_IF_PS_TCP_FIELD64_ATOMIC
#undef COPY_IF_PS_UDP_FIELD64_ATOMIC
}

void
if_copy_rxpoll_stats(struct ifnet *ifp, struct if_rxpoll_stats *if_rs)
{
        bzero(if_rs, sizeof (*if_rs));
        if (!(ifp->if_eflags & IFEF_RXPOLL) || !ifnet_is_attached(ifp, 1))
                return;

        /* by now, ifnet will stay attached so if_inp must be valid */
        VERIFY(ifp->if_inp != NULL);
        bcopy(&ifp->if_inp->pstats, if_rs, sizeof (*if_rs));

        /* Release the IO refcnt */
        ifnet_decr_iorefcnt(ifp);
}

struct ifaddr *
ifa_remref(struct ifaddr *ifa, int locked)
{
        if (!locked)
                IFA_LOCK_SPIN(ifa);
        else
                IFA_LOCK_ASSERT_HELD(ifa);

        if (ifa->ifa_refcnt == 0)
                panic("%s: ifa %p negative refcnt\n", __func__, ifa);
        else if (ifa->ifa_trace != NULL)
                (*ifa->ifa_trace)(ifa, FALSE);
        if (--ifa->ifa_refcnt == 0) {
                if (ifa->ifa_debug & IFD_ATTACHED)
                        panic("ifa %p attached to ifp is being freed\n", ifa);
                /*
                 * Some interface addresses are allocated either statically
                 * or carved out of a larger block.  Only free it if it was
                 * allocated via MALLOC or via the corresponding per-address
                 * family allocator.  Otherwise, leave it alone.
                 */
                if (ifa->ifa_debug & IFD_ALLOC) {
                        if (ifa->ifa_free == NULL) {
                                IFA_UNLOCK(ifa);
                                FREE(ifa, M_IFADDR);
                        } else {
                                /* Become a regular mutex */
                                IFA_CONVERT_LOCK(ifa);
                                /* callee will unlock */
                                (*ifa->ifa_free)(ifa);
                        }
                } else {
                        IFA_UNLOCK(ifa);
                }
                ifa = NULL;
        }

        if (!locked && ifa != NULL)
                IFA_UNLOCK(ifa);

        return (ifa);
}

void
ifa_addref(struct ifaddr *ifa, int locked)
{
        if (!locked)
                IFA_LOCK_SPIN(ifa);
        else
                IFA_LOCK_ASSERT_HELD(ifa);

        if (++ifa->ifa_refcnt == 0) {
                panic("%s: ifa %p wraparound refcnt\n", __func__, ifa);
                /* NOTREACHED */
        } else if (ifa->ifa_trace != NULL) {
                (*ifa->ifa_trace)(ifa, TRUE);
        }
        if (!locked)
                IFA_UNLOCK(ifa);
}

void
ifa_lock_init(struct ifaddr *ifa)
{
        lck_mtx_init(&ifa->ifa_lock, ifa_mtx_grp, ifa_mtx_attr);
}

void
ifa_lock_destroy(struct ifaddr *ifa)
{
        IFA_LOCK_ASSERT_NOTHELD(ifa);
        lck_mtx_destroy(&ifa->ifa_lock, ifa_mtx_grp);
}

/*
 * 'i' group ioctls.
 *
 * The switch statement below does nothing at runtime, as it serves as a
 * compile time check to ensure that all of the socket 'i' ioctls (those
 * in the 'i' group going thru soo_ioctl) that are made available by the
 * networking stack is unique.  This works as long as this routine gets
 * updated each time a new interface ioctl gets added.
 *
 * Any failures at compile time indicates duplicated ioctl values.
 */
static __attribute__((unused)) void
ifioctl_cassert(void)
{
        /*
         * This is equivalent to _CASSERT() and the compiler wouldn't
         * generate any instructions, thus for compile time only.
         */
        switch ((u_long)0) {
        case 0:

        /* bsd/net/if_ppp.h */
        case SIOCGPPPSTATS:
        case SIOCGPPPCSTATS:

#if INET6
        /* bsd/netinet6/in6_var.h */
        case SIOCSIFADDR_IN6:
        case SIOCGIFADDR_IN6:
        case SIOCSIFDSTADDR_IN6:
        case SIOCSIFNETMASK_IN6:
        case SIOCGIFDSTADDR_IN6:
        case SIOCGIFNETMASK_IN6:
        case SIOCDIFADDR_IN6:
        case SIOCAIFADDR_IN6_32:
        case SIOCAIFADDR_IN6_64:
        case SIOCSIFPHYADDR_IN6_32:
        case SIOCSIFPHYADDR_IN6_64:
        case SIOCGIFPSRCADDR_IN6:
        case SIOCGIFPDSTADDR_IN6:
        case SIOCGIFAFLAG_IN6:
        case SIOCGDRLST_IN6_32:
        case SIOCGDRLST_IN6_64:
        case SIOCGPRLST_IN6_32:
        case SIOCGPRLST_IN6_64:
        case OSIOCGIFINFO_IN6:
        case SIOCGIFINFO_IN6:
        case SIOCSNDFLUSH_IN6:
        case SIOCGNBRINFO_IN6_32:
        case SIOCGNBRINFO_IN6_64:
        case SIOCSPFXFLUSH_IN6:
        case SIOCSRTRFLUSH_IN6:
        case SIOCGIFALIFETIME_IN6:
        case SIOCSIFALIFETIME_IN6:
        case SIOCGIFSTAT_IN6:
        case SIOCGIFSTAT_ICMP6:
        case SIOCSDEFIFACE_IN6_32:
        case SIOCSDEFIFACE_IN6_64:
        case SIOCGDEFIFACE_IN6_32:
        case SIOCGDEFIFACE_IN6_64:
        case SIOCSIFINFO_FLAGS:
        case SIOCSSCOPE6:
        case SIOCGSCOPE6:
        case SIOCGSCOPE6DEF:
        case SIOCSIFPREFIX_IN6:
        case SIOCGIFPREFIX_IN6:
        case SIOCDIFPREFIX_IN6:
        case SIOCAIFPREFIX_IN6:
        case SIOCCIFPREFIX_IN6:
        case SIOCSGIFPREFIX_IN6:
        case SIOCPROTOATTACH_IN6_32:
        case SIOCPROTOATTACH_IN6_64:
        case SIOCPROTODETACH_IN6:
        case SIOCLL_START_32:
        case SIOCLL_START_64:
        case SIOCLL_STOP:
        case SIOCAUTOCONF_START:
        case SIOCAUTOCONF_STOP:
        case SIOCSETROUTERMODE_IN6:
        case SIOCLL_CGASTART_32:
        case SIOCLL_CGASTART_64:
        case SIOCGIFCGAPREP_IN6:
        case SIOCSIFCGAPREP_IN6:
#endif /* INET6 */

        /* bsd/sys/sockio.h */
        case SIOCSIFADDR:
        case OSIOCGIFADDR:
        case SIOCSIFDSTADDR:
        case OSIOCGIFDSTADDR:
        case SIOCSIFFLAGS:
        case SIOCGIFFLAGS:
        case OSIOCGIFBRDADDR:
        case SIOCSIFBRDADDR:
        case OSIOCGIFCONF32:
        case OSIOCGIFCONF64:
        case OSIOCGIFNETMASK:
        case SIOCSIFNETMASK:
        case SIOCGIFMETRIC:
        case SIOCSIFMETRIC:
        case SIOCDIFADDR:
        case SIOCAIFADDR:

        case SIOCGIFADDR:
        case SIOCGIFDSTADDR:
        case SIOCGIFBRDADDR:
        case SIOCGIFCONF32:
        case SIOCGIFCONF64:
        case SIOCGIFNETMASK:
        case SIOCAUTOADDR:
        case SIOCAUTONETMASK:
        case SIOCARPIPLL:

        case SIOCADDMULTI:
        case SIOCDELMULTI:
        case SIOCGIFMTU:
        case SIOCSIFMTU:
        case SIOCGIFPHYS:
        case SIOCSIFPHYS:
        case SIOCSIFMEDIA:
        case SIOCGIFMEDIA32:
        case SIOCGIFMEDIA64:
        case SIOCSIFGENERIC:
        case SIOCGIFGENERIC:
        case SIOCRSLVMULTI:

        case SIOCSIFLLADDR:
        case SIOCGIFSTATUS:
        case SIOCSIFPHYADDR:
        case SIOCGIFPSRCADDR:
        case SIOCGIFPDSTADDR:
        case SIOCDIFPHYADDR:

        case SIOCGIFDEVMTU:
        case SIOCSIFALTMTU:
        case SIOCGIFALTMTU:
        case SIOCSIFBOND:
        case SIOCGIFBOND:

        case SIOCPROTOATTACH:
        case SIOCPROTODETACH:

        case SIOCSIFCAP:
        case SIOCGIFCAP:

        case SIOCIFCREATE:
        case SIOCIFDESTROY:
        case SIOCIFCREATE2:

        case SIOCSDRVSPEC32:
        case SIOCGDRVSPEC32:
        case SIOCSDRVSPEC64:
        case SIOCGDRVSPEC64:

        case SIOCSIFVLAN:
        case SIOCGIFVLAN:

        case SIOCIFGCLONERS32:
        case SIOCIFGCLONERS64:

        case SIOCGIFASYNCMAP:
        case SIOCSIFASYNCMAP:
#if CONFIG_MACF_NET
        case SIOCGIFMAC:
        case SIOCSIFMAC:
#endif /* CONFIG_MACF_NET */
        case SIOCSIFKPI:
        case SIOCGIFKPI:

        case SIOCGIFWAKEFLAGS:

        case SIOCGIFGETRTREFCNT:
        case SIOCGIFLINKQUALITYMETRIC:
        case SIOCSIFOPPORTUNISTIC:
        case SIOCGIFOPPORTUNISTIC:
        case SIOCSETROUTERMODE:
        case SIOCGIFEFLAGS:
        case SIOCSIFDESC:
        case SIOCGIFDESC:
        case SIOCSIFLINKPARAMS:
        case SIOCGIFLINKPARAMS:
        case SIOCGIFQUEUESTATS:
        case SIOCSIFTHROTTLE:
        case SIOCGIFTHROTTLE:

        case SIOCGASSOCIDS32:
        case SIOCGASSOCIDS64:
        case SIOCGCONNIDS32:
        case SIOCGCONNIDS64:
        case SIOCGCONNINFO32:
        case SIOCGCONNINFO64:
        case SIOCSCONNORDER:
        case SIOCGCONNORDER:

        case SIOCSIFLOG:
        case SIOCGIFLOG:
        case SIOCGIFDELEGATE:
        case SIOCGIFLLADDR:
        case SIOCGIFTYPE:
        case SIOCGIFEXPENSIVE:
        case SIOCSIFEXPENSIVE:
        case SIOCGIF2KCL:
        case SIOCSIF2KCL:
        case SIOCGSTARTDELAY:

        case SIOCAIFAGENTID:
        case SIOCDIFAGENTID:
        case SIOCGIFAGENTIDS32:
        case SIOCGIFAGENTIDS64:
        case SIOCGIFAGENTDATA32:
        case SIOCGIFAGENTDATA64:
        case SIOCGIFAGENTLIST32:
        case SIOCGIFAGENTLIST64:


        case SIOCSIFINTERFACESTATE:
        case SIOCGIFINTERFACESTATE:
        case SIOCSIFPROBECONNECTIVITY:
        case SIOCGIFPROBECONNECTIVITY:

        case SIOCGIFFUNCTIONALTYPE:
        case SIOCSIFNETSIGNATURE:
        case SIOCGIFNETSIGNATURE:

        case SIOCGECNMODE:
        case SIOCSECNMODE:

        case SIOCSQOSMARKINGMODE:
        case SIOCSQOSMARKINGENABLED:
        case SIOCGQOSMARKINGMODE:
        case SIOCGQOSMARKINGENABLED:
                ;
        }
}

/*
 * XXX: This API is only used by BSD stack and for now will always return 0.
 * For Skywalk native drivers, preamble space need not be allocated in mbuf
 * as the preamble will be reserved in the translated skywalk packet
 * which is transmitted to the driver.
 * For Skywalk compat drivers currently headroom is always set to zero.
 */
uint32_t
ifnet_mbuf_packetpreamblelen(struct ifnet *ifp)
{
#pragma unused(ifp)
        return (0);
}

/* The following is used to enqueue work items for interface events */
struct intf_event {
        struct ifnet *ifp;
        union sockaddr_in_4_6 addr;
        uint32_t intf_event_code;
};

static void
intf_event_callback(void *arg)
{
        struct intf_event *p_intf_ev = (struct intf_event *)arg;

        /* Call this before we walk the tree */
        EVENTHANDLER_INVOKE(&ifnet_evhdlr_ctxt, ifnet_event, p_intf_ev->ifp,
            (struct sockaddr *)&(p_intf_ev->addr), p_intf_ev->intf_event_code);
}

struct intf_event_nwk_wq_entry {
        struct nwk_wq_entry nwk_wqe;
        struct intf_event intf_ev_arg;
};

void
intf_event_enqueue_nwk_wq_entry(struct ifnet *ifp, struct sockaddr *addrp,
    uint32_t intf_event_code)
{
#pragma unused(addrp)
        struct intf_event_nwk_wq_entry *p_intf_ev = NULL;

        MALLOC(p_intf_ev, struct intf_event_nwk_wq_entry *,
            sizeof(struct intf_event_nwk_wq_entry),
            M_NWKWQ, M_WAITOK | M_ZERO);

        p_intf_ev->intf_ev_arg.ifp = ifp;
        /*
         * XXX Not using addr in the arg. This will be used
         * once we need IP address add/delete events
         */
        p_intf_ev->intf_ev_arg.intf_event_code = intf_event_code;
        p_intf_ev->nwk_wqe.func = intf_event_callback;
        p_intf_ev->nwk_wqe.is_arg_managed = TRUE;
        p_intf_ev->nwk_wqe.arg = &p_intf_ev->intf_ev_arg;
        nwk_wq_enqueue((struct nwk_wq_entry*)p_intf_ev);
}