xnu-792.22.5.tar.gz

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

/*
 * Copyright (c) 2000 Apple Computer, 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) 1988, 1991, 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.
 *
 *      @(#)rtsock.c    8.5 (Berkeley) 11/2/94
 */


#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/syslog.h>
#include <kern/lock.h>

#include <net/if.h>
#include <net/route.h>
#include <net/raw_cb.h>
#include <netinet/in.h>

#include <machine/spl.h>

extern void m_copydata(struct mbuf *, int, int, caddr_t);
extern void m_copyback(struct mbuf *, int, int, caddr_t);

extern struct rtstat rtstat;
extern int rttrash;

MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");

extern lck_mtx_t *rt_mtx;
static struct   sockaddr route_dst = { 2, PF_ROUTE, { 0, } };
static struct   sockaddr route_src = { 2, PF_ROUTE, { 0, } };
static struct   sockaddr sa_zero   = { sizeof(sa_zero), AF_INET, { 0, } };
static struct   sockproto route_proto = { PF_ROUTE,  0 };

struct walkarg {
        int     w_tmemsize;
        int     w_op, w_arg;
        caddr_t w_tmem;
        struct sysctl_req *w_req;
};

static struct mbuf *
                rt_msg1(int, struct rt_addrinfo *);
static int      rt_msg2(int, struct rt_addrinfo *, caddr_t, struct walkarg *);
static int      rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *);
static int      sysctl_dumpentry(struct radix_node *rn, void *vw);
static int      sysctl_iflist(int af, struct walkarg *w);
static int      sysctl_iflist2(int af, struct walkarg *w);
static int       route_output(struct mbuf *, struct socket *);
static void      rt_setmetrics(u_long, struct rt_metrics *, struct rt_metrics *);
static void     rt_setif(struct rtentry *, struct sockaddr *, struct sockaddr *,
                              struct sockaddr *);

/* Sleazy use of local variables throughout file, warning!!!! */
#define dst     info.rti_info[RTAX_DST]
#define gate    info.rti_info[RTAX_GATEWAY]
#define netmask info.rti_info[RTAX_NETMASK]
#define genmask info.rti_info[RTAX_GENMASK]
#define ifpaddr info.rti_info[RTAX_IFP]
#define ifaaddr info.rti_info[RTAX_IFA]
#define brdaddr info.rti_info[RTAX_BRD]

/*
 * It really doesn't make any sense at all for this code to share much
 * with raw_usrreq.c, since its functionality is so restricted.  XXX
 */
static int
rts_abort(struct socket *so)
{
        int error;
        
        error = raw_usrreqs.pru_abort(so);
        return error;
}

/* pru_accept is EOPNOTSUPP */

static int
rts_attach(struct socket *so, int proto, __unused struct proc *p)
{
        struct rawcb *rp;
        int error;

        if (sotorawcb(so) != 0)
                return EISCONN; /* XXX panic? */
        MALLOC(rp, struct rawcb *, sizeof *rp, M_PCB, M_WAITOK); /* XXX */
        if (rp == 0)
                return ENOBUFS;
        bzero(rp, sizeof *rp);

        /*
         * The splnet() is necessary to block protocols from sending
         * error notifications (like RTM_REDIRECT or RTM_LOSING) while
         * this PCB is extant but incompletely initialized.
         * Probably we should try to do more of this work beforehand and
         * eliminate the spl.
         */
        so->so_pcb = (caddr_t)rp;
        error = raw_attach(so, proto);  /* don't use raw_usrreqs.pru_attach, it checks for SS_PRIV */
        rp = sotorawcb(so);
        if (error) {
                FREE(rp, M_PCB);
                so->so_pcb = 0;
                so->so_flags |= SOF_PCBCLEARING;
                return error;
        }

        switch(rp->rcb_proto.sp_protocol) {
//####LD route_cb needs looking
        case AF_INET:
                route_cb.ip_count++;
                break;
        case AF_INET6:
                route_cb.ip6_count++;
                break;
        case AF_IPX:
                route_cb.ipx_count++;
                break;
        case AF_NS:
                route_cb.ns_count++;
                break;
        }
        rp->rcb_faddr = &route_src;
        route_cb.any_count++;
        /* the socket is already locked when we enter rts_attach */ 
        soisconnected(so);
        so->so_options |= SO_USELOOPBACK;
        return 0;
}

static int
rts_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
{
        int s, error;
        s = splnet();
        error = raw_usrreqs.pru_bind(so, nam, p); /* xxx just EINVAL */
        splx(s);
        return error;
}

static int
rts_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
{
        int s, error;
        s = splnet();
        error = raw_usrreqs.pru_connect(so, nam, p); /* XXX just EINVAL */
        splx(s);
        return error;
}

/* pru_connect2 is EOPNOTSUPP */
/* pru_control is EOPNOTSUPP */

static int
rts_detach(struct socket *so)
{
        struct rawcb *rp = sotorawcb(so);
        int s, error;

        s = splnet();
        if (rp != 0) {
                switch(rp->rcb_proto.sp_protocol) {
                case AF_INET:
                        route_cb.ip_count--;
                        break;
                case AF_INET6:
                        route_cb.ip6_count--;
                        break;
                case AF_IPX:
                        route_cb.ipx_count--;
                        break;
                case AF_NS:
                        route_cb.ns_count--;
                        break;
                }
                route_cb.any_count--;
        }
        error = raw_usrreqs.pru_detach(so);
        splx(s);
        return error;
}

static int
rts_disconnect(struct socket *so)
{
        int s, error;
        s = splnet();
        error = raw_usrreqs.pru_disconnect(so);
        splx(s);
        return error;
}

/* pru_listen is EOPNOTSUPP */

static int
rts_peeraddr(struct socket *so, struct sockaddr **nam)
{
        int s, error;
        s = splnet();
        error = raw_usrreqs.pru_peeraddr(so, nam);
        splx(s);
        return error;
}

/* pru_rcvd is EOPNOTSUPP */
/* pru_rcvoob is EOPNOTSUPP */

static int
rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
         struct mbuf *control, struct proc *p)
{
        int s, error;
        s = splnet();
        error = raw_usrreqs.pru_send(so, flags, m, nam, control, p);
        splx(s);
        return error;
}

/* pru_sense is null */

static int
rts_shutdown(struct socket *so)
{
        int s, error;
        s = splnet();
        error = raw_usrreqs.pru_shutdown(so);
        splx(s);
        return error;
}

static int
rts_sockaddr(struct socket *so, struct sockaddr **nam)
{
        int s, error;
        s = splnet();
        error = raw_usrreqs.pru_sockaddr(so, nam);
        splx(s);
        return error;
}

static struct pr_usrreqs route_usrreqs = {
        rts_abort, pru_accept_notsupp, rts_attach, rts_bind,
        rts_connect, pru_connect2_notsupp, pru_control_notsupp,
        rts_detach, rts_disconnect, pru_listen_notsupp, rts_peeraddr,
        pru_rcvd_notsupp, pru_rcvoob_notsupp, rts_send, pru_sense_null,
        rts_shutdown, rts_sockaddr, sosend, soreceive, pru_sopoll_notsupp
};

/*ARGSUSED*/
static int
route_output(m, so)
        struct mbuf *m;
        struct socket *so;
{
        struct rt_msghdr *rtm = 0;
        struct rtentry *rt = 0;
        struct rtentry *saved_nrt = 0;
        struct radix_node_head *rnh;
        struct rt_addrinfo info;
        int len, error = 0;
        struct ifnet *ifp = 0;
#ifndef __APPLE__
        struct proc  *curproc = current_proc();
#endif
        int sendonlytoself = 0;

#define senderr(e) { error = e; goto flush;}
        if (m == 0 || ((m->m_len < sizeof(long)) && (m = m_pullup(m, sizeof(long))) == 0))
                return (ENOBUFS);
        if ((m->m_flags & M_PKTHDR) == 0)
                panic("route_output");

        /* unlock the socket (but keep a reference) it won't be accessed until raw_input appends to it. */
        socket_unlock(so, 0);
        lck_mtx_lock(rt_mtx);

        len = m->m_pkthdr.len;
        if (len < sizeof(*rtm) ||
            len != mtod(m, struct rt_msghdr *)->rtm_msglen) {
                dst = 0;
                senderr(EINVAL);
        }
        R_Malloc(rtm, struct rt_msghdr *, len);
        if (rtm == 0) {
                dst = 0;
                senderr(ENOBUFS);
        }
        m_copydata(m, 0, len, (caddr_t)rtm);
        if (rtm->rtm_version != RTM_VERSION) {
                dst = 0;
                senderr(EPROTONOSUPPORT);
        }
        
        /*
         * Silent version of RTM_GET for Reachabiltiy APIs. We may change
         * all RTM_GETs to be silent in the future, so this is private for now.
         */
        if (rtm->rtm_type == RTM_GET_SILENT) {
                if ((so->so_options & SO_USELOOPBACK) == 0)
                        senderr(EINVAL);
                sendonlytoself = 1;
                rtm->rtm_type = RTM_GET;
        }
        
        /*
         * Perform permission checking, only privileged sockets
         * may perform operations other than RTM_GET
         */
        if (rtm->rtm_type != RTM_GET && (so->so_state & SS_PRIV) == 0) {
                dst = 0;
                senderr(EPERM);
        }

        rtm->rtm_pid = proc_selfpid();
        info.rti_addrs = rtm->rtm_addrs;
        if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info)) {
                dst = 0;
                senderr(EINVAL);
        }
        if (dst == 0 || (dst->sa_family >= AF_MAX)
            || (gate != 0 && (gate->sa_family >= AF_MAX))) {
                senderr(EINVAL);
        }
        if (genmask) {
                struct radix_node *t;
                t = rn_addmask((caddr_t)genmask, 0, 1);
                if (t && Bcmp(genmask, t->rn_key, *(u_char *)genmask) == 0)
                        genmask = (struct sockaddr *)(t->rn_key);
                else
                        senderr(ENOBUFS);
        }
        switch (rtm->rtm_type) {
        
                case RTM_ADD:
                        if (gate == 0)
                                senderr(EINVAL);

#ifdef __APPLE__
/* XXX LD11JUL02 Special case for AOL 5.1.2 connectivity issue to AirPort BS (Radar 2969954)
 * AOL is adding a circular route ("10.0.1.1/32 10.0.1.1") when establishing its ppp tunnel
 * to the AP BaseStation by removing the default gateway and replacing it with their tunnel entry point.
 * There is no apparent reason to add this route as there is a valid 10.0.1.1/24 route to the BS.
 * That circular route was ignored on previous version of MacOS X because of a routing bug
 * corrected with the merge to FreeBSD4.4 (a route generated from an RTF_CLONING route had the RTF_WASCLONED
 * flag set but did not have a reference to the parent route) and that entry was left in the RT. This workaround is
 * made in order to provide binary compatibility with AOL. 
 * If we catch a process adding a circular route with a /32 from the routing socket, we error it out instead of
 * confusing the routing table with a wrong route to the previous default gateway
 */
{
                        extern int check_routeselfref;
#define satosinaddr(sa) (((struct sockaddr_in *)sa)->sin_addr.s_addr)
        
                        if (check_routeselfref && (dst && dst->sa_family == AF_INET) && 
                                (netmask && satosinaddr(netmask) == INADDR_BROADCAST) &&
                                (gate && satosinaddr(dst) == satosinaddr(gate))) {
                                        log(LOG_WARNING, "route_output: circular route %ld.%ld.%ld.%ld/32 ignored\n",
                                                (ntohl(satosinaddr(gate)>>24))&0xff,
                                                (ntohl(satosinaddr(gate)>>16))&0xff,
                                                (ntohl(satosinaddr(gate)>>8))&0xff,
                                                (ntohl(satosinaddr(gate)))&0xff);
                                                
                                        senderr(EINVAL);
                        }
}
#endif  
                        error = rtrequest_locked(RTM_ADD, dst, gate, netmask,
                                                rtm->rtm_flags, &saved_nrt);
                        if (error == 0 && saved_nrt) {
#ifdef __APPLE__
                                /* 
                                 * If the route request specified an interface with
                                 * IFA and/or IFP, we set the requested interface on
                                 * the route with rt_setif.  It would be much better
                                 * to do this inside rtrequest, but that would
                                 * require passing the desired interface, in some
                                 * form, to rtrequest.  Since rtrequest is called in
                                 * so many places (roughly 40 in our source), adding
                                 * a parameter is to much for us to swallow; this is
                                 * something for the FreeBSD developers to tackle.
                                 * Instead, we let rtrequest compute whatever
                                 * interface it wants, then come in behind it and
                                 * stick in the interface that we really want.  This
                                 * works reasonably well except when rtrequest can't
                                 * figure out what interface to use (with
                                 * ifa_withroute) and returns ENETUNREACH.  Ideally
                                 * it shouldn't matter if rtrequest can't figure out
                                 * the interface if we're going to explicitly set it
                                 * ourselves anyway.  But practically we can't
                                 * recover here because rtrequest will not do any of
                                 * the work necessary to add the route if it can't
                                 * find an interface.  As long as there is a default
                                 * route that leads to some interface, rtrequest will
                                 * find an interface, so this problem should be
                                 * rarely encountered.
                                 * dwiggins@bbn.com
                                 */
        
                                rt_setif(saved_nrt, ifpaddr, ifaaddr, gate);
#endif
                                rt_setmetrics(rtm->rtm_inits,
                                        &rtm->rtm_rmx, &saved_nrt->rt_rmx);
                                saved_nrt->rt_rmx.rmx_locks &= ~(rtm->rtm_inits);
                                saved_nrt->rt_rmx.rmx_locks |=
                                        (rtm->rtm_inits & rtm->rtm_rmx.rmx_locks);
                                rtunref(saved_nrt);
                                saved_nrt->rt_genmask = genmask;
                        }
                        break;

                case RTM_DELETE:
                        error = rtrequest_locked(RTM_DELETE, dst, gate, netmask,
                                        rtm->rtm_flags, &saved_nrt);
                        if (error == 0) {
                                if ((rt = saved_nrt))
                                        rtref(rt);
                                goto report;
                        }
                        break;

                case RTM_GET:
                case RTM_CHANGE:
                case RTM_LOCK:
                        if ((rnh = rt_tables[dst->sa_family]) == 0) {
                                senderr(EAFNOSUPPORT);
                        } else if ((rt = (struct rtentry *)
                                        rnh->rnh_lookup(dst, netmask, rnh)) != NULL)
                                rtref(rt);
                        else
                                senderr(ESRCH);
                        switch(rtm->rtm_type) {

                                case RTM_GET: {
                                        struct ifaddr *ifa2;
                                report:
                                        dst = rt_key(rt);
                                        gate = rt->rt_gateway;
                                        netmask = rt_mask(rt);
                                        genmask = rt->rt_genmask;
                                        if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
                                                ifp = rt->rt_ifp;
                                                if (ifp) {
                                                        ifnet_lock_shared(ifp);
                                                        ifa2 = ifp->if_addrhead.tqh_first;
                                                        ifpaddr = ifa2->ifa_addr;
                                                        ifnet_lock_done(ifp);
                                                        ifaaddr = rt->rt_ifa->ifa_addr;
                                                        rtm->rtm_index = ifp->if_index;
                                                } else {
                                                        ifpaddr = 0;
                                                        ifaaddr = 0;
                                                }
                                        }
                                        len = rt_msg2(rtm->rtm_type, &info, (caddr_t)0,
                                                (struct walkarg *)0);
                                        if (len > rtm->rtm_msglen) {
                                                struct rt_msghdr *new_rtm;
                                                R_Malloc(new_rtm, struct rt_msghdr *, len);
                                                if (new_rtm == 0) {
                                                        senderr(ENOBUFS);
                                                }
                                                Bcopy(rtm, new_rtm, rtm->rtm_msglen);
                                                R_Free(rtm); rtm = new_rtm;
                                        }
                                        (void)rt_msg2(rtm->rtm_type, &info, (caddr_t)rtm,
                                                (struct walkarg *)0);
                                        rtm->rtm_flags = rt->rt_flags;
                                        rtm->rtm_rmx = rt->rt_rmx;
                                        rtm->rtm_addrs = info.rti_addrs;
                                        }
                                        break;

                                case RTM_CHANGE:
                                        if (gate && (error = rt_setgate(rt, rt_key(rt), gate)))
                                                senderr(error);
                
                                        /*
                                         * If they tried to change things but didn't specify
                                         * the required gateway, then just use the old one.
                                         * This can happen if the user tries to change the
                                         * flags on the default route without changing the
                                         * default gateway.  Changing flags still doesn't work.
                                         */
                                        if ((rt->rt_flags & RTF_GATEWAY) && !gate)
                                                gate = rt->rt_gateway;
                
#ifdef __APPLE__
                                        /*
                                         * On Darwin, we call rt_setif which contains the
                                         * equivalent to the code found at this very spot
                                         * in BSD.
                                         */
                                        rt_setif(rt, ifpaddr, ifaaddr, gate);
#endif
                
                                        rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx,
                                                        &rt->rt_rmx);
#ifndef __APPLE__
                                        /* rt_setif, called above does this for us on darwin */
                                        if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest)
                                                   rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, gate);
#endif
                                        if (genmask)
                                                rt->rt_genmask = genmask;
                                        /*
                                         * Fall into
                                         */
                                case RTM_LOCK:
                                        rt->rt_rmx.rmx_locks &= ~(rtm->rtm_inits);
                                        rt->rt_rmx.rmx_locks |=
                                                (rtm->rtm_inits & rtm->rtm_rmx.rmx_locks);
                                        break;
                                }
                        break;
        
                default:
                        senderr(EOPNOTSUPP);
        }
flush:
        if (rtm) {
                if (error)
                        rtm->rtm_errno = error;
                else
                        rtm->rtm_flags |= RTF_DONE;
        }
        if (rt)
                rtfree_locked(rt);
        lck_mtx_unlock(rt_mtx);
        socket_lock(so, 0);     /* relock the socket now */
    {
        struct rawcb *rp = 0;
        /*
         * Check to see if we don't want our own messages.
         */
        if ((so->so_options & SO_USELOOPBACK) == 0) {
                if (route_cb.any_count <= 1) {
                        if (rtm)
                                R_Free(rtm);
                        m_freem(m);
                        return (error);
                }
                /* There is another listener, so construct message */
                rp = sotorawcb(so);
        }
        if (rtm) {
                m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm);
                if (m->m_pkthdr.len < rtm->rtm_msglen) {
                        m_freem(m);
                        m = NULL;
                } else if (m->m_pkthdr.len > rtm->rtm_msglen)
                        m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len);
                R_Free(rtm);
        }
        if (sendonlytoself && m) {
                error = 0;
                if (sbappendaddr(&so->so_rcv, &route_src, m, (struct mbuf*)0, &error) != 0) {
                        sorwakeup(so);
                }
                if (error)
                        return error;
        } else {
                if (rp)
                        rp->rcb_proto.sp_family = 0; /* Avoid us */
                if (dst)
                        route_proto.sp_protocol = dst->sa_family;
                if (m) {
                        socket_unlock(so, 0);
                        raw_input(m, &route_proto, &route_src, &route_dst);
                        socket_lock(so, 0);
                }
                if (rp)
                        rp->rcb_proto.sp_family = PF_ROUTE;
                }
        }
        return (error);
}

static void
rt_setmetrics(which, in, out)
        u_long which;
        struct rt_metrics *in, *out;
{
#define metric(f, e) if (which & (f)) out->e = in->e;
        metric(RTV_RPIPE, rmx_recvpipe);
        metric(RTV_SPIPE, rmx_sendpipe);
        metric(RTV_SSTHRESH, rmx_ssthresh);
        metric(RTV_RTT, rmx_rtt);
        metric(RTV_RTTVAR, rmx_rttvar);
        metric(RTV_HOPCOUNT, rmx_hopcount);
        metric(RTV_MTU, rmx_mtu);
        metric(RTV_EXPIRE, rmx_expire);
#undef metric
}

/*
 * Set route's interface given ifpaddr, ifaaddr, and gateway.
 */
static void
rt_setif(
        struct rtentry *rt,
        struct sockaddr *Ifpaddr,
        struct sockaddr *Ifaaddr,
        struct sockaddr *Gate)
{
        struct ifaddr *ifa = 0;
        struct ifnet  *ifp = 0;

        lck_mtx_assert(rt_mtx, LCK_MTX_ASSERT_OWNED);

        /* new gateway could require new ifaddr, ifp;
           flags may also be different; ifp may be specified
           by ll sockaddr when protocol address is ambiguous */
        if (Ifpaddr && (ifa = ifa_ifwithnet(Ifpaddr)) &&
            (ifp = ifa->ifa_ifp) && (Ifaaddr || Gate)) {
            ifafree(ifa);
                ifa = ifaof_ifpforaddr(Ifaaddr ? Ifaaddr : Gate,
                                        ifp);
        }
        else
        {
                if (ifa) {
                        ifafree(ifa);
                        ifa = 0;
                }
                if (Ifpaddr && (ifp = if_withname(Ifpaddr)) ) {
                        if (Gate) {
                                ifa = ifaof_ifpforaddr(Gate, ifp);
                        }
                        else {
                                ifnet_lock_shared(ifp);
                                ifa = TAILQ_FIRST(&ifp->if_addrhead);
                                ifaref(ifa);
                                ifnet_lock_done(ifp);
                        }
                }
                else if (Ifaaddr && (ifa = ifa_ifwithaddr(Ifaaddr))) {
                        ifp = ifa->ifa_ifp;
                }
                else if (Gate && (ifa = ifa_ifwithroute(rt->rt_flags,
                                                rt_key(rt), Gate))) {
                        ifp = ifa->ifa_ifp;
                }
        }
        if (ifa) {
                struct ifaddr *oifa = rt->rt_ifa;
                if (oifa != ifa) {
                    if (oifa && oifa->ifa_rtrequest)
                        oifa->ifa_rtrequest(RTM_DELETE,
                                                rt, Gate);
                        rtsetifa(rt, ifa);
                    rt->rt_ifp = ifp;
                    rt->rt_rmx.rmx_mtu = ifp->if_mtu;
                    if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest)
                                rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, Gate);
                } else {
                        ifafree(ifa);
                        goto call_ifareq;
                }
                ifafree(ifa);
                return;
        }
      call_ifareq:
        /* XXX: to reset gateway to correct value, at RTM_CHANGE */
        if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest)
                rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, Gate);
}


#define ROUNDUP(a) \
        ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))


/*
 * Extract the addresses of the passed sockaddrs.
 * Do a little sanity checking so as to avoid bad memory references.
 * This data is derived straight from userland.
 */
static int
rt_xaddrs(cp, cplim, rtinfo)
        caddr_t cp, cplim;
        struct rt_addrinfo *rtinfo;
{
        struct sockaddr *sa;
        int i;

        bzero(rtinfo->rti_info, sizeof(rtinfo->rti_info));
        for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) {
                if ((rtinfo->rti_addrs & (1 << i)) == 0)
                        continue;
                sa = (struct sockaddr *)cp;
                /*
                 * It won't fit.
                 */
                if ( (cp + sa->sa_len) > cplim ) {
                        return (EINVAL);
                }

                /*
                 * there are no more.. quit now
                 * If there are more bits, they are in error.
                 * I've seen this. route(1) can evidently generate these. 
                 * This causes kernel to core dump.
                 * for compatibility, If we see this, point to a safe address.
                 */
                if (sa->sa_len == 0) {
                        rtinfo->rti_info[i] = &sa_zero;
                        return (0); /* should be EINVAL but for compat */
                }

                /* accept it */
                rtinfo->rti_info[i] = sa;
                ADVANCE(cp, sa);
        }
        return (0);
}

static struct mbuf *
rt_msg1(
        int type,
        struct rt_addrinfo *rtinfo)
{
        struct rt_msghdr *rtm;
        struct mbuf *m;
        int i;
        struct sockaddr *sa;
        int len, dlen;

        switch (type) {

        case RTM_DELADDR:
        case RTM_NEWADDR:
                len = sizeof(struct ifa_msghdr);
                break;

        case RTM_DELMADDR:
        case RTM_NEWMADDR:
                len = sizeof(struct ifma_msghdr);
                break;

        case RTM_IFINFO:
                len = sizeof(struct if_msghdr);
                break;

        default:
                len = sizeof(struct rt_msghdr);
        }
        if (len > MCLBYTES)
                panic("rt_msg1");
        m = m_gethdr(M_DONTWAIT, MT_DATA);
        if (m && len > MHLEN) {
                MCLGET(m, M_DONTWAIT);
                if ((m->m_flags & M_EXT) == 0) {
                        m_free(m);
                        m = NULL;
                }
        }
        if (m == 0)
                return (m);
        m->m_pkthdr.len = m->m_len = len;
        m->m_pkthdr.rcvif = 0;
        rtm = mtod(m, struct rt_msghdr *);
        bzero((caddr_t)rtm, len);
        for (i = 0; i < RTAX_MAX; i++) {
                if ((sa = rtinfo->rti_info[i]) == NULL)
                        continue;
                rtinfo->rti_addrs |= (1 << i);
                dlen = ROUNDUP(sa->sa_len);
                m_copyback(m, len, dlen, (caddr_t)sa);
                len += dlen;
        }
        if (m->m_pkthdr.len != len) {
                m_freem(m);
                return (NULL);
        }
        rtm->rtm_msglen = len;
        rtm->rtm_version = RTM_VERSION;
        rtm->rtm_type = type;
        return (m);
}

static int
rt_msg2(type, rtinfo, cp, w)
        int type;
        struct rt_addrinfo *rtinfo;
        caddr_t cp;
        struct walkarg *w;
{
        int i;
        int len, dlen, second_time = 0;
        caddr_t cp0;

        rtinfo->rti_addrs = 0;
again:
        switch (type) {

        case RTM_DELADDR:
        case RTM_NEWADDR:
                len = sizeof(struct ifa_msghdr);
                break;

        case RTM_DELMADDR:
        case RTM_NEWMADDR:
                len = sizeof(struct ifma_msghdr);
                break;

        case RTM_IFINFO:
                len = sizeof(struct if_msghdr);
                break;

        case RTM_IFINFO2:
                len = sizeof(struct if_msghdr2);
                break;

        case RTM_NEWMADDR2:
                len = sizeof(struct ifma_msghdr2);
                break;

        case RTM_GET2:
                len = sizeof(struct rt_msghdr2);
                break;

        default:
                len = sizeof(struct rt_msghdr);
        }
        cp0 = cp;
        if (cp0)
                cp += len;
        for (i = 0; i < RTAX_MAX; i++) {
                struct sockaddr *sa;

                if ((sa = rtinfo->rti_info[i]) == 0)
                        continue;
                rtinfo->rti_addrs |= (1 << i);
                dlen = ROUNDUP(sa->sa_len);
                if (cp) {
                        bcopy((caddr_t)sa, cp, (unsigned)dlen);
                        cp += dlen;
                }
                len += dlen;
        }
        if (cp == 0 && w != NULL && !second_time) {
                struct walkarg *rw = w;

                if (rw->w_req) {
                        if (rw->w_tmemsize < len) {
                                if (rw->w_tmem)
                                        FREE(rw->w_tmem, M_RTABLE);
                                rw->w_tmem = (caddr_t)
                                        _MALLOC(len, M_RTABLE, M_WAITOK); /*###LD0412 was NOWAIT */
                                if (rw->w_tmem)
                                        rw->w_tmemsize = len;
                        }
                        if (rw->w_tmem) {
                                cp = rw->w_tmem;
                                second_time = 1;
                                goto again;
                        }
                }
        }
        if (cp) {
                struct rt_msghdr *rtm = (struct rt_msghdr *)cp0;

                rtm->rtm_version = RTM_VERSION;
                rtm->rtm_type = type;
                rtm->rtm_msglen = len;
        }
        return (len);
}

/*
 * This routine is called to generate a message from the routing
 * socket indicating that a redirect has occurred, a routing lookup
 * has failed, or that a protocol has detected timeouts to a particular
 * destination.
 */
void
rt_missmsg(type, rtinfo, flags, error)
        int type, flags, error;
        struct rt_addrinfo *rtinfo;
{
        struct rt_msghdr *rtm;
        struct mbuf *m;
        struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];

        lck_mtx_assert(rt_mtx, LCK_MTX_ASSERT_OWNED);

        if (route_cb.any_count == 0)
                return;
        m = rt_msg1(type, rtinfo);
        if (m == 0)
                return;
        rtm = mtod(m, struct rt_msghdr *);
        rtm->rtm_flags = RTF_DONE | flags;
        rtm->rtm_errno = error;
        rtm->rtm_addrs = rtinfo->rti_addrs;
        route_proto.sp_protocol = sa ? sa->sa_family : 0;
        raw_input(m, &route_proto, &route_src, &route_dst);
}

/*
 * This routine is called to generate a message from the routing
 * socket indicating that the status of a network interface has changed.
 */
void
rt_ifmsg(
        struct ifnet *ifp)
{
        struct if_msghdr *ifm;
        struct mbuf *m;
        struct rt_addrinfo info;

        if (route_cb.any_count == 0)
                return;
        bzero((caddr_t)&info, sizeof(info));
        m = rt_msg1(RTM_IFINFO, &info);
        if (m == 0)
                return;
        ifm = mtod(m, struct if_msghdr *);
        ifm->ifm_index = ifp->if_index;
        ifm->ifm_flags = (u_short)ifp->if_flags;
        if_data_internal_to_if_data(&ifp->if_data, &ifm->ifm_data);
        ifm->ifm_addrs = 0;
        route_proto.sp_protocol = 0;
        raw_input(m, &route_proto, &route_src, &route_dst);
}

/*
 * This is called to generate messages from the routing socket
 * indicating a network interface has had addresses associated with it.
 * if we ever reverse the logic and replace messages TO the routing
 * socket indicate a request to configure interfaces, then it will
 * be unnecessary as the routing socket will automatically generate
 * copies of it.
 *
 * Since this is coming from the interface, it is expected that the
 * interface will be locked.
 */
void
rt_newaddrmsg(cmd, ifa, error, rt)
        int cmd, error;
        struct ifaddr *ifa;
        struct rtentry *rt;
{
        struct rt_addrinfo info;
        struct sockaddr *sa = 0;
        int pass;
        struct mbuf *m = 0;
        struct ifnet *ifp = ifa->ifa_ifp;

        if (route_cb.any_count == 0)
                return;
        for (pass = 1; pass < 3; pass++) {
                bzero((caddr_t)&info, sizeof(info));
                if ((cmd == RTM_ADD && pass == 1) ||
                    (cmd == RTM_DELETE && pass == 2)) {
                        struct ifa_msghdr *ifam;
                        int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;

                        ifaaddr = sa = ifa->ifa_addr;
                        ifpaddr = ifp->if_addrhead.tqh_first->ifa_addr;
                        netmask = ifa->ifa_netmask;
                        brdaddr = ifa->ifa_dstaddr;
                        if ((m = rt_msg1(ncmd, &info)) == NULL)
                                continue;
                        ifam = mtod(m, struct ifa_msghdr *);
                        ifam->ifam_index = ifp->if_index;
                        ifam->ifam_metric = ifa->ifa_metric;
                        ifam->ifam_flags = ifa->ifa_flags;
                        ifam->ifam_addrs = info.rti_addrs;
                }
                if ((cmd == RTM_ADD && pass == 2) ||
                    (cmd == RTM_DELETE && pass == 1)) {
                        struct rt_msghdr *rtm;

                        if (rt == 0)
                                continue;
                        netmask = rt_mask(rt);
                        dst = sa = rt_key(rt);
                        gate = rt->rt_gateway;
                        if ((m = rt_msg1(cmd, &info)) == NULL)
                                continue;
                        rtm = mtod(m, struct rt_msghdr *);
                        rtm->rtm_index = ifp->if_index;
                        rtm->rtm_flags |= rt->rt_flags;
                        rtm->rtm_errno = error;
                        rtm->rtm_addrs = info.rti_addrs;
                }
                route_proto.sp_protocol = sa ? sa->sa_family : 0;
                raw_input(m, &route_proto, &route_src, &route_dst);
        }
}

/*
 * This is the analogue to the rt_newaddrmsg which performs the same
 * function but for multicast group memberhips.  This is easier since
 * there is no route state to worry about.
 */
void
rt_newmaddrmsg(cmd, ifma)
        int cmd;
        struct ifmultiaddr *ifma;
{
        struct rt_addrinfo info;
        struct mbuf *m = 0;
        struct ifnet *ifp = ifma->ifma_ifp;
        struct ifma_msghdr *ifmam;

        if (route_cb.any_count == 0)
                return;

        bzero((caddr_t)&info, sizeof(info));
        ifaaddr = ifma->ifma_addr;
        if (ifp && ifp->if_addrhead.tqh_first)
                ifpaddr = ifp->if_addrhead.tqh_first->ifa_addr;
        else
                ifpaddr = NULL;
        /*
         * If a link-layer address is present, present it as a ``gateway''
         * (similarly to how ARP entries, e.g., are presented).
         */
        gate = ifma->ifma_ll->ifma_addr;
        if ((m = rt_msg1(cmd, &info)) == NULL)
                return;
        ifmam = mtod(m, struct ifma_msghdr *);
        ifmam->ifmam_index = ifp ? ifp->if_index : 0;
        ifmam->ifmam_addrs = info.rti_addrs;
        route_proto.sp_protocol = ifma->ifma_addr->sa_family;
        raw_input(m, &route_proto, &route_src, &route_dst);
}

/*
 * This is used in dumping the kernel table via sysctl().
 */
int
sysctl_dumpentry(rn, vw)
        struct radix_node *rn;
        void *vw;
{
        struct walkarg *w = vw;
        struct rtentry *rt = (struct rtentry *)rn;
        int error = 0, size;
        struct rt_addrinfo info;

        if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
                return 0;
        bzero((caddr_t)&info, sizeof(info));
        dst = rt_key(rt);
        gate = rt->rt_gateway;
        netmask = rt_mask(rt);
        genmask = rt->rt_genmask;
        if (w->w_op != NET_RT_DUMP2) {
                size = rt_msg2(RTM_GET, &info, 0, w);
                if (w->w_req && w->w_tmem) {
                        struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;

                        rtm->rtm_flags = rt->rt_flags;
                        rtm->rtm_use = rt->rt_use;
                        rtm->rtm_rmx = rt->rt_rmx;
                        rtm->rtm_index = rt->rt_ifp->if_index;
                        rtm->rtm_pid = 0;
                        rtm->rtm_seq = 0;
                        rtm->rtm_errno = 0;
                        rtm->rtm_addrs = info.rti_addrs;
                        error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
                        return (error);
                }
        } else {
                size = rt_msg2(RTM_GET2, &info, 0, w);
                if (w->w_req && w->w_tmem) {
                        struct rt_msghdr2 *rtm = (struct rt_msghdr2 *)w->w_tmem;

                        rtm->rtm_flags = rt->rt_flags;
                        rtm->rtm_use = rt->rt_use;
                        rtm->rtm_rmx = rt->rt_rmx;
                        rtm->rtm_index = rt->rt_ifp->if_index;
                        rtm->rtm_refcnt = rt->rt_refcnt;
                        if (rt->rt_parent)
                                rtm->rtm_parentflags = rt->rt_parent->rt_flags;
                        else
                                rtm->rtm_parentflags = 0;
                        rtm->rtm_reserved = 0;
                        rtm->rtm_addrs = info.rti_addrs;
                        error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
                        return (error);

                }
        }
        return (error);
}

int
sysctl_iflist(
        int     af,
        struct  walkarg *w)
{
        struct ifnet *ifp;
        struct ifaddr *ifa;
        struct  rt_addrinfo info;
        int     len, error = 0;

        bzero((caddr_t)&info, sizeof(info));
        ifnet_head_lock_shared();
        TAILQ_FOREACH(ifp, &ifnet_head, if_link) {
                if (error)
                        break;
                if (w->w_arg && w->w_arg != ifp->if_index)
                        continue;
                ifnet_lock_shared(ifp);
                ifa = ifp->if_addrhead.tqh_first;
                ifpaddr = ifa->ifa_addr;
                len = rt_msg2(RTM_IFINFO, &info, (caddr_t)0, w);
                ifpaddr = 0;
                if (w->w_req && w->w_tmem) {
                        struct if_msghdr *ifm;

                        ifm = (struct if_msghdr *)w->w_tmem;
                        ifm->ifm_index = ifp->if_index;
                        ifm->ifm_flags = (u_short)ifp->if_flags;
                        if_data_internal_to_if_data(&ifp->if_data, &ifm->ifm_data);
                        ifm->ifm_addrs = info.rti_addrs;
                        error = SYSCTL_OUT(w->w_req,(caddr_t)ifm, len);
                        if (error) {
                                ifnet_lock_done(ifp);
                                break;
                        }
                }
                while ((ifa = ifa->ifa_link.tqe_next) != 0) {
                        if (af && af != ifa->ifa_addr->sa_family)
                                continue;
#ifndef __APPLE__
                        if (curproc->p_prison && prison_if(curproc, ifa->ifa_addr))
                                continue;
#endif
                        ifaaddr = ifa->ifa_addr;
                        netmask = ifa->ifa_netmask;
                        brdaddr = ifa->ifa_dstaddr;
                        len = rt_msg2(RTM_NEWADDR, &info, 0, w);
                        if (w->w_req && w->w_tmem) {
                                struct ifa_msghdr *ifam;

                                ifam = (struct ifa_msghdr *)w->w_tmem;
                                ifam->ifam_index = ifa->ifa_ifp->if_index;
                                ifam->ifam_flags = ifa->ifa_flags;
                                ifam->ifam_metric = ifa->ifa_metric;
                                ifam->ifam_addrs = info.rti_addrs;
                                error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
                                if (error)
                                        break;
                        }
                }
                ifnet_lock_done(ifp);
                ifaaddr = netmask = brdaddr = 0;
        }
        ifnet_head_done();
        return error;
}

int
sysctl_iflist2(
        int     af,
        struct  walkarg *w)
{
        struct ifnet *ifp;
        struct ifaddr *ifa;
        struct  rt_addrinfo info;
        int     len, error = 0;
        
        bzero((caddr_t)&info, sizeof(info));
        ifnet_head_lock_shared();
        TAILQ_FOREACH(ifp, &ifnet_head, if_link) {
                if (error)
                        break;
                if (w->w_arg && w->w_arg != ifp->if_index)
                        continue;
                ifnet_lock_shared(ifp);
                ifa = ifp->if_addrhead.tqh_first;
                ifpaddr = ifa->ifa_addr;
                len = rt_msg2(RTM_IFINFO2, &info, (caddr_t)0, w);
                ifpaddr = 0;
                if (w->w_req && w->w_tmem) {
                        struct if_msghdr2 *ifm;

                        ifm = (struct if_msghdr2 *)w->w_tmem;
                        ifm->ifm_addrs = info.rti_addrs;
                        ifm->ifm_flags = (u_short)ifp->if_flags;
                        ifm->ifm_index = ifp->if_index;
                        ifm->ifm_snd_len = ifp->if_snd.ifq_len;
                        ifm->ifm_snd_maxlen = ifp->if_snd.ifq_maxlen;
                        ifm->ifm_snd_drops = ifp->if_snd.ifq_drops;
                        ifm->ifm_timer = ifp->if_timer;
                        if_data_internal_to_if_data64(&ifp->if_data, &ifm->ifm_data);
                        error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
                        if (error) {
                                ifnet_lock_done(ifp);
                                break;
                        }
                }
                while ((ifa = ifa->ifa_link.tqe_next) != 0) {
                        if (af && af != ifa->ifa_addr->sa_family)
                                continue;
                        ifaaddr = ifa->ifa_addr;
                        netmask = ifa->ifa_netmask;
                        brdaddr = ifa->ifa_dstaddr;
                        len = rt_msg2(RTM_NEWADDR, &info, 0, w);
                        if (w->w_req && w->w_tmem) {
                                struct ifa_msghdr *ifam;

                                ifam = (struct ifa_msghdr *)w->w_tmem;
                                ifam->ifam_index = ifa->ifa_ifp->if_index;
                                ifam->ifam_flags = ifa->ifa_flags;
                                ifam->ifam_metric = ifa->ifa_metric;
                                ifam->ifam_addrs = info.rti_addrs;
                                error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
                                if (error)
                                        break;
                        }
                }
                if (error) {
                        ifnet_lock_done(ifp);
                        break;
                }
                {
                        struct ifmultiaddr *ifma;
                        
                        for (ifma = ifp->if_multiaddrs.lh_first; ifma;
                                ifma = ifma->ifma_link.le_next) {
                                if (af && af != ifma->ifma_addr->sa_family)
                                        continue;
                                bzero((caddr_t)&info, sizeof(info));
                                ifaaddr = ifma->ifma_addr;
                                if (ifp->if_addrhead.tqh_first)
                                        ifpaddr = ifp->if_addrhead.tqh_first->ifa_addr;
                                if (ifma->ifma_ll)
                                        gate = ifma->ifma_ll->ifma_addr;
                                len = rt_msg2(RTM_NEWMADDR2, &info, 0, w);
                                if (w->w_req && w->w_tmem) {
                                        struct ifma_msghdr2 *ifmam;

                                        ifmam = (struct ifma_msghdr2 *)w->w_tmem;
                                        ifmam->ifmam_addrs = info.rti_addrs;
                                        ifmam->ifmam_flags = 0;
                                        ifmam->ifmam_index = ifma->ifma_ifp->if_index;
                                        ifmam->ifmam_refcount = ifma->ifma_refcount;
                                        error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
                                        if (error)
                                                break;
                                }
                        }
                }
                ifnet_lock_done(ifp);
                ifaaddr = netmask = brdaddr = 0;
        }
        ifnet_head_done();
        return error;
}


static int
sysctl_rtstat(struct sysctl_req *req)
{
        int error;

        error = SYSCTL_OUT(req, &rtstat, sizeof(struct rtstat));
        if (error)
                return (error);

        return 0;
}

static int
sysctl_rttrash(struct sysctl_req *req)
{
        int error;

        error = SYSCTL_OUT(req, &rttrash, sizeof(rttrash));
        if (error)
                return (error);

        return 0;
}


static int
sysctl_rtsock SYSCTL_HANDLER_ARGS
{
        int     *name = (int *)arg1;
        u_int   namelen = arg2;
        struct radix_node_head *rnh;
        int     i, error = EINVAL;
        u_char  af;
        struct  walkarg w;

        name ++;
        namelen--;
        if (req->newptr)
                return (EPERM);
        if (namelen != 3)
                return (EINVAL);
        af = name[0];
        Bzero(&w, sizeof(w));
        w.w_op = name[1];
        w.w_arg = name[2];
        w.w_req = req;

        switch (w.w_op) {

        case NET_RT_DUMP:
        case NET_RT_DUMP2:
        case NET_RT_FLAGS:
                lck_mtx_lock(rt_mtx);
                for (i = 1; i <= AF_MAX; i++)
                        if ((rnh = rt_tables[i]) && (af == 0 || af == i) &&
                            (error = rnh->rnh_walktree(rnh,
                                                        sysctl_dumpentry, &w)))
                                break;
                lck_mtx_unlock(rt_mtx);
                break;
        case NET_RT_IFLIST:
                error = sysctl_iflist(af, &w);
                break;
        case NET_RT_IFLIST2:
                error = sysctl_iflist2(af, &w);
                break;
        case NET_RT_STAT:
                error = sysctl_rtstat(req);
                break;
        case NET_RT_TRASH:
                error = sysctl_rttrash(req);
                break;
        }
        if (w.w_tmem)
                FREE(w.w_tmem, M_RTABLE);
        return (error);
}

SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, "");

/*
 * Definitions of protocols supported in the ROUTE domain.
 */

struct domain routedomain;              /* or at least forward */

static struct protosw routesw[] = {
{ SOCK_RAW,     &routedomain,   0,              PR_ATOMIC|PR_ADDR,
  0,            route_output,   raw_ctlinput,   0,
  0,
  raw_init,     0,              0,              0,
  0, 
  &route_usrreqs,
  0,                    0,              0,
  { 0, 0 },     0,      { 0 }
}
};

struct domain routedomain =
    { PF_ROUTE, "route", route_init, 0, 0,
      routesw, 
      0, 0, 0, 0, 0, 0, 0, 0, 
      { 0, 0 } };

DOMAIN_SET(route);