xnu-1699.24.23.tar.gz

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

/*
 * Copyright (c) 2000-2010 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 <kern/zalloc.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/net_osdep.h>
#include <net/ethernet.h>

#include <net/radix.h>
#include <net/route.h>
#ifdef __APPLE__
#include <net/dlil.h>
//#include <string.h>
#include <sys/domain.h>
#include <libkern/OSAtomic.h>
#endif

#if INET || INET6
/*XXX*/
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#include <netinet/ip6.h>
#if INET6
#include <netinet6/in6_var.h>
#include <netinet6/in6_ifattach.h>
#include <netinet6/ip6_var.h>
#endif
#endif

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


/*
 * System initialization
 */

/* 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 ifconf(u_long cmd, user_addr_t ifrp, int * ret_space);
static void if_qflush(struct ifqueue *);
__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 int if_rtmtu(struct radix_node *, void *);
static void if_rtmtu_update(struct ifnet *);

#if IF_CLONE_LIST
static int      if_clone_list(int count, int * total, user_addr_t dst);
#endif /* IF_CLONE_LIST */

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

int     ifqmaxlen = IFQ_MAXLEN;
struct  ifnethead ifnet_head = TAILQ_HEAD_INITIALIZER(ifnet_head);

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


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);
}

/*
 * 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;

        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);
                if (new_ifnet_addrs == NULL) {
                        --if_index;
                        return -1;
                }

                new_ifindex2ifnet = new_ifnet_addrs 
                        + new_if_indexlim * sizeof(caddr_t);
                bzero(new_ifnet_addrs, n);
                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 **)new_ifnet_addrs;
                ifindex2ifnet = (struct ifnet **)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;
        size_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 = 0xffff;
        } 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;
        bzero(ifc->ifc_units, len);
        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--;
}

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

        *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) {
                strlcpy(outbuf, ifc->ifc_name, IFNAMSIZ);
                error = copyout(outbuf, dst, IFNAMSIZ);
                if (error)
                        break;
        }

        return (error);
}
#endif /* IF_CLONE_LIST */

/*
 * 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);
}

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

#define equal(a1, a2)                                                   \
        (bcmp((const void*)(a1), (const void*)(a2),                     \
            ((const struct sockaddr *)(a1))->sa_len) == 0)

        ifnet_head_lock_shared();
        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 (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 &&
                            equal(ifa->ifa_broadaddr, addr)) {
                                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 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->ifa_dstaddr &&
                                    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(const struct sockaddr *addr, unsigned int ifscope)
{
        struct ifaddr *result = NULL;
        struct ifnet *ifp;

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

        ifnet_head_lock_shared();
        if (ifscope > (unsigned int)if_index) {
                ifnet_head_done();
                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 (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 &&
                            equal(ifa->ifa_broadaddr, addr)) {
                                result = ifa;
                                IFA_ADDREF_LOCKED(ifa); /* for caller */
                                IFA_UNLOCK(ifa);
                                break;
                        }
                        IFA_UNLOCK(ifa);
                }
                ifnet_lock_done(ifp);
        }
        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) ||
            (af == AF_INET && !ip_doscopedroute) ||
            (af == AF_INET6 && !ip6_doscopedroute))
#else
        if (af != AF_INET || !ip_doscopedroute)
#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 *)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;
                        }
#ifndef __APPLE__
/* This breaks tunneling application trying to install a route with
 * a specific subnet and the local address as the destination
 * It's breaks binary compatibility with previous version of MacOS X
 */
                        if (
#if INET6 /* XXX: for maching gif tunnel dst as routing entry gateway */
                            addr->sa_family != AF_INET6 &&
#endif
                            ifp->if_flags & IFF_POINTOPOINT) {
                                /*
                                 * This is a bit broken as it doesn't
                                 * take into account that the remote end may
                                 * be a single node in the network we are
                                 * looking for.
                                 * The trouble is that we don't know the
                                 * netmask for the remote end.
                                 */
                                if (ifa->ifa_dstaddr != 0 &&
                                    equal(addr, ifa->ifa_dstaddr)) {
                                        IFA_ADDREF_LOCKED(ifa);
                                        IFA_UNLOCK(ifa);
                                        break;
                                }
                                IFA_UNLOCK(ifa);
                        } else
#endif /* __APPLE__*/
                        {
                                /*
                                 * 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 (equal(addr, ifa->ifa_addr) || (ifa->ifa_dstaddr &&
                            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->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)) {
                                IFA_ADDREF_LOCKED(ifa); /* for caller */
                                IFA_UNLOCK(ifa);
                                break;
                        }
                } else {
                        if (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;

        /* 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);
        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 and flush the send queue */
        ifnet_lock_exclusive(ifp);
        if (!up)
                if_qflush(&ifp->if_snd);
        ifp->if_eflags &= ~IFEF_UPDOWNCHANGE;
        wakeup(&ifp->if_eflags);
        
        return;
}

/*
 * 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.
 */
static void
if_qflush(struct ifqueue *ifq)
{
        struct mbuf *m, *n;

        n = ifq->ifq_head;
        while ((m = n) != 0) {
                n = m->m_act;
                m_freem(m);
        }
        ifq->ifq_head = NULL;
        ifq->ifq_tail = NULL;
        ifq->ifq_len = 0;
}

/*
 * Map interface name to
 * interface structure pointer.
 */
struct ifnet *
ifunit(const char *name)
{
        char namebuf[IFNAMSIZ + 1];
        const char *cp;
        struct ifnet *ifp;
        int unit;
        unsigned len, m;
        char c;

        len = strlen(name);
        if (len < 2 || len > IFNAMSIZ)
                return (NULL);
        cp = name + len - 1;
        c = *cp;
        if (c < '0' || c > '9')
                return (NULL);          /* trailing garbage */
        unit = 0;
        m = 1;
        do {
                if (cp == name)
                        return (NULL);  /* no interface name */
                unit += (c - '0') * m;
                if (unit > 1000000)
                        return (NULL);  /* number is unreasonable */
                m *= 10;
                c = *--cp;
        } while (c >= '0' && c <= '9');
        len = cp - name + 1;
        bcopy(name, namebuf, len);
        namebuf[len] = '\0';
        /*
         * Now search all the interfaces for this name/number
         */
        ifnet_head_lock_shared();
        TAILQ_FOREACH(ifp, &ifnet_head, if_link) {
                if (strncmp(ifp->if_name, namebuf, len))
                        continue;
                if (unit == ifp->if_unit)
                        break;
        }
        ifnet_head_done();
        return (ifp);
}


/*
 * 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 *)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));
}


/*
 * Interface ioctls.
 */
int
ifioctl(struct socket *so, u_long cmd, caddr_t data, struct proc *p)
{
        struct ifnet *ifp;
        struct ifreq *ifr;
        struct ifstat *ifs;
        int error = 0;
        short oif_flags;
        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 OSIOCGIFCONF32:
        case SIOCGIFCONF32: {
                struct ifconf32 *ifc = (struct ifconf32 *)data;
                return (ifconf(cmd, CAST_USER_ADDR_T(ifc->ifc_req),
                    &ifc->ifc_len));
                /* NOTREACHED */
        }
        case SIOCGIFCONF64:
        case OSIOCGIFCONF64: {
                struct ifconf64 *ifc = (struct ifconf64 *)data;
                return (ifconf(cmd, ifc->ifc_req, &ifc->ifc_len));
                /* NOTREACHED */
        }
        }
        ifr = (struct ifreq *)data;
        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);
#if IF_CLONE_LIST
        case SIOCIFGCLONERS32: {
                struct if_clonereq32 *ifcr = (struct if_clonereq32 *)data;
                return (if_clone_list(ifcr->ifcr_count, &ifcr->ifcr_total,
                    CAST_USER_ADDR_T(ifcr->ifcru_buffer)));
                /* NOTREACHED */

        }
        case SIOCIFGCLONERS64: {
                struct if_clonereq64 *ifcr = (struct if_clonereq64 *)data;
                return (if_clone_list(ifcr->ifcr_count, &ifcr->ifcr_total,
                    ifcr->ifcru_buffer));
                /* NOTREACHED */
            }
#endif /* IF_CLONE_LIST */
        }

        ifp = ifunit(ifr->ifr_name);
        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 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;
#endif
        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, so->so_proto->pr_domain->dom_family,
                    cmd, data);

                /*
                 * 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;
                kev_post_msg(&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, so->so_proto->pr_domain->dom_family,
                    cmd, data);

                ifnet_touch_lastchange(ifp);
                break;

#if CONFIG_MACF_NET
        case SIOCSIFMAC:
                error = mac_ifnet_label_set(kauth_cred_get(), ifr, ifp);
                break;
#endif
        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;
                kev_post_msg(&ev_msg);

                ifnet_touch_lastchange(ifp);
                break;

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

                error = ifnet_ioctl(ifp, so->so_proto->pr_domain->dom_family,
                    cmd, data);
                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;
                kev_post_msg(&ev_msg);

                ifnet_touch_lastchange(ifp);
                break;

        case SIOCSIFMTU:
        {
                u_int32_t oldmtu = ifp->if_mtu;

                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, so->so_proto->pr_domain->dom_family,
                    cmd, data);
                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;
                kev_post_msg(&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
                }
                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;
                kev_post_msg(&ev_msg);

                ifnet_touch_lastchange(ifp);
                break;

        case SIOCSIFPHYADDR:
        case SIOCDIFPHYADDR:
#if INET6
        case SIOCSIFPHYADDR_IN6_32:
        case SIOCSIFPHYADDR_IN6_64:
#endif
        case SIOCSLIFPHYADDR:
        case SIOCSIFMEDIA:
        case SIOCSIFGENERIC:
        case SIOCSIFLLADDR:
        case SIOCSIFALTMTU:
        case SIOCSIFVLAN:
        case SIOCSIFBOND:
                error = proc_suser(p);
                if (error != 0)
                        break;

                error = ifnet_ioctl(ifp, so->so_proto->pr_domain->dom_family,
                    cmd, data);
                if (error != 0)
                        break;

                ifnet_touch_lastchange(ifp);
                break;

        case SIOCGIFSTATUS:
                ifs = (struct ifstat *)data;
                ifs->ascii[0] = '\0';

        case SIOCGIFPSRCADDR:
        case SIOCGIFPDSTADDR:
        case SIOCGLIFPHYADDR:
        case SIOCGIFMEDIA32:
        case SIOCGIFMEDIA64:
        case SIOCGIFGENERIC:
        case SIOCGIFDEVMTU:
                error = ifnet_ioctl(ifp, so->so_proto->pr_domain->dom_family,
                    cmd, data);
                break;

        case SIOCGIFVLAN:
        case SIOCGIFBOND:
                error = ifnet_ioctl(ifp, so->so_proto->pr_domain->dom_family,
                    cmd, data);
                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;

        default:
                oif_flags = ifp->if_flags;
                if (so->so_proto == NULL) {
                        error = EOPNOTSUPP;
                        break;
                }
            {
                u_long ocmd = cmd;

                switch (cmd) {
                case SIOCSIFDSTADDR:
                case SIOCSIFADDR:
                case SIOCSIFBRDADDR:
                case 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
                        break;

                case OSIOCGIFADDR:
                        cmd = SIOCGIFADDR;
                        break;

                case OSIOCGIFDSTADDR:
                        cmd = SIOCGIFDSTADDR;
                        break;

                case OSIOCGIFBRDADDR:
                        cmd = SIOCGIFBRDADDR;
                        break;

                case OSIOCGIFNETMASK:
                        cmd = SIOCGIFNETMASK;
                }

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

                switch (ocmd) {
                case OSIOCGIFADDR:
                case OSIOCGIFDSTADDR:
                case OSIOCGIFBRDADDR:
                case OSIOCGIFNETMASK:
                        *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;

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

                if (error == EOPNOTSUPP || error == ENOTSUP)
                        error = ifnet_ioctl(ifp,
                            so->so_proto->pr_domain->dom_family, cmd, data);

                break;
        }
        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%d: promiscuous mode %s%s\n",
                    ifp->if_name, ifp->if_unit,
                    (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;

        /*
         * 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%d", ifp->if_name, ifp->if_unit);
                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;

                        IFA_LOCK(ifa);
                        sa = ifa->ifa_addr;
#ifndef __APPLE__
                        if (curproc->p_prison && prison_if(curproc, sa)) {
                                IFA_UNLOCK(ifa);
                                continue;
                        }
#endif
                        addrs++;
                        if (cmd == OSIOCGIFCONF32 || cmd == OSIOCGIFCONF64) {
                                struct osockaddr *osa =
                                         (struct osockaddr *)&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;
        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 (!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 =
                                                                                        (const struct sockaddr_dl*)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(), AppleTalk, 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(), AppleTalk, 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 (!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);
}

/*
 * We don't use if_setlladdr, our interfaces are responsible for
 * handling the SIOCSIFLLADDR ioctl.
 */
#ifndef __APPLE__
int
if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
{
        ...
}
#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");


/*
 * 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 (use_routegenid)
                routegenid_update();
        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);
        }

        if (use_routegenid)
                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 IF_LASTCHANGEUPTIME
        if_data->ifi_lastchange.tv_sec += boottime_sec();
#endif

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

#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)

        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);

#undef COPY_IF_TC_FIELD64_ATOMIC
}


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; e.g. AppleTalk addresses.
                 * 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);
}