/*      $NetBSD: rtsock_shared.c,v 1.23 2022/10/04 07:06:31 msaitoh Exp $       */

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * 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. Neither the name of the project 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 PROJECT 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 PROJECT 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.
 */

/*
 * 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. 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    8.7 (Berkeley) 10/12/95
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rtsock_shared.c,v 1.23 2022/10/04 07:06:31 msaitoh Exp $");

#ifdef _KERNEL_OPT
#include "opt_inet.h"
#include "opt_net_mpsafe.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/sysctl.h>
#include <sys/kauth.h>
#include <sys/kmem.h>
#include <sys/intr.h>
#include <sys/condvar.h>
#include <sys/compat_stub.h>

#include <net/if.h>
#include <net/if_llatbl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/raw_cb.h>

#include <netinet/in_var.h>
#include <netinet/if_inarp.h>

#include <netmpls/mpls.h>

#include <compat/net/if.h>
#include <compat/net/route.h>

/* sa_family is after sa_len, rest is data */
#define _SA_MINSIZE     (offsetof(struct sockaddr, sa_family) + \
                         sizeof(((struct sockaddr *)0)->sa_family))

#ifdef COMPAT_RTSOCK
/*
 * These are used when #include-d from compat/common/rtsock_50.c
 */
#define RTM_XVERSION    RTM_OVERSION
#define RTM_XNEWADDR    RTM_ONEWADDR
#define RTM_XDELADDR    RTM_ODELADDR
#define RTM_XCHGADDR    RTM_OCHGADDR
#define RT_XADVANCE(a,b) RT_OADVANCE(a,b)
#define RT_XROUNDUP(n)  RT_OROUNDUP(n)
#define PF_XROUTE       PF_OROUTE
#define rt_xmsghdr      rt_msghdr50
#define if_xmsghdr      if_msghdr       /* if_msghdr50 is for RTM_OIFINFO */
#define ifa_xmsghdr     ifa_msghdr50
#define if_xannouncemsghdr      if_announcemsghdr50
#define COMPATNAME(x)   compat_50_ ## x
#define DOMAINNAME      "oroute"
#define COMPATCALL(name, args)          \
        MODULE_HOOK_CALL_VOID(rtsock_ ## name ## _50_hook, args, __nothing);
#define RTS_CTASSERT(x) __nothing
CTASSERT(sizeof(struct ifa_xmsghdr) == 20);
DOMAIN_DEFINE(compat_50_routedomain); /* forward declare and add to link set */
#else /* COMPAT_RTSOCK */
/*
 * These are used normally, when not #include-d from compat/common/rtsock_50.c
 */
#define RTM_XVERSION    RTM_VERSION
#define RTM_XNEWADDR    RTM_NEWADDR
#define RTM_XDELADDR    RTM_DELADDR
#define RTM_XCHGADDR    RTM_CHGADDR
#define RT_XADVANCE(a,b) RT_ADVANCE(a,b)
#define RT_XROUNDUP(n)  RT_ROUNDUP(n)
#define PF_XROUTE       PF_ROUTE
#define rt_xmsghdr      rt_msghdr
#define if_xmsghdr      if_msghdr
#define ifa_xmsghdr     ifa_msghdr
#define if_xannouncemsghdr      if_announcemsghdr
#define COMPATNAME(x)   x
#define DOMAINNAME      "route"
#define COMPATCALL(name, args)  __nothing;
#define RTS_CTASSERT(x) CTASSERT(x)
CTASSERT(sizeof(struct ifa_xmsghdr) == 32);
DOMAIN_DEFINE(routedomain); /* forward declare and add to link set */
#endif /* COMPAT_RTSOCK */

#ifdef RTSOCK_DEBUG
#define RT_IN_PRINT(info, b, a) (in_print((b), sizeof(b), \
    &((const struct sockaddr_in *)(info)->rti_info[(a)])->sin_addr), (b))
#endif /* RTSOCK_DEBUG */

struct route_info COMPATNAME(route_info) = {
        .ri_dst = { .sa_len = 2, .sa_family = PF_XROUTE, },
        .ri_src = { .sa_len = 2, .sa_family = PF_XROUTE, },
        .ri_maxqlen = IFQ_MAXLEN,
};

static void COMPATNAME(route_init)(void);
static int COMPATNAME(route_output)(struct mbuf *, struct socket *);

static int rt_xaddrs(u_char, const char *, const char *, struct rt_addrinfo *);
static struct mbuf *rt_makeifannouncemsg(struct ifnet *, int, int,
    struct rt_addrinfo *);
static int rt_msg2(int, struct rt_addrinfo *, void *, struct rt_walkarg *, int *);
static void _rt_setmetrics(int, const struct rt_xmsghdr *, struct rtentry *);
static void rtm_setmetrics(const struct rtentry *, struct rt_xmsghdr *);
static void rt_adjustcount(int, int);

static const struct protosw COMPATNAME(route_protosw)[];

struct routecb {
        struct rawcb    rocb_rcb;
        unsigned int    rocb_msgfilter;
#define RTMSGFILTER(m)  (1U << (m))
        char            *rocb_missfilter;
        size_t          rocb_missfilterlen;
};
#define sotoroutecb(so) ((struct routecb *)(so)->so_pcb)

static struct rawcbhead rt_rawcb;
#ifdef NET_MPSAFE
static kmutex_t *rt_so_mtx;

static bool rt_updating = false;
static kcondvar_t rt_update_cv;
#endif

static void
rt_adjustcount(int af, int cnt)
{
        struct route_cb * const cb = &COMPATNAME(route_info).ri_cb;

        cb->any_count += cnt;

        switch (af) {
        case AF_INET:
                cb->ip_count += cnt;
                return;
#ifdef INET6
        case AF_INET6:
                cb->ip6_count += cnt;
                return;
#endif
        case AF_MPLS:
                cb->mpls_count += cnt;
                return;
        }
}

static int
COMPATNAME(route_filter)(struct mbuf *m, struct sockproto *proto,
    struct rawcb *rp)
{
        struct routecb *rop = (struct routecb *)rp;
        struct rt_xmsghdr rtm;

        KASSERT(m != NULL);
        KASSERT(proto != NULL);
        KASSERT(rp != NULL);

        /* Wrong family for this socket. */
        if (proto->sp_family != PF_ROUTE)
                return ENOPROTOOPT;

        /* If no filter set, just return. */
        if (rop->rocb_msgfilter == 0 && rop->rocb_missfilterlen == 0)
                return 0;

        /* Ensure we can access rtm_type */
        if (m->m_len <
            offsetof(struct rt_xmsghdr, rtm_type) + sizeof(rtm.rtm_type))
                return EINVAL;

        m_copydata(m, offsetof(struct rt_xmsghdr, rtm_type),
            sizeof(rtm.rtm_type), &rtm.rtm_type);
        if (rtm.rtm_type >= sizeof(rop->rocb_msgfilter) * CHAR_BIT)
                return EINVAL;
        /* If the rtm type is filtered out, return a positive. */
        if (rop->rocb_msgfilter != 0 &&
            !(rop->rocb_msgfilter & RTMSGFILTER(rtm.rtm_type)))
                return EEXIST;

        if (rop->rocb_missfilterlen != 0 && rtm.rtm_type == RTM_MISS) {
                __CTASSERT(RTAX_DST == 0);
                struct sockaddr_storage ss;
                struct sockaddr *dst = (struct sockaddr *)&ss, *sa;
                char *cp = rop->rocb_missfilter;
                char *ep = cp + rop->rocb_missfilterlen;

                /* Ensure we can access sa_len */
                if (m->m_pkthdr.len < sizeof(rtm) + _SA_MINSIZE)
                        return EINVAL;
                m_copydata(m, sizeof(rtm) + offsetof(struct sockaddr, sa_len),
                    sizeof(ss.ss_len), &ss.ss_len);
                if (ss.ss_len < _SA_MINSIZE ||
                    ss.ss_len > sizeof(ss) ||
                    m->m_pkthdr.len < sizeof(rtm) + ss.ss_len)
                        return EINVAL;
                /* Copy out the destination sockaddr */
                m_copydata(m, sizeof(rtm), ss.ss_len, &ss);

                /* Find a matching sockaddr in the filter */
                while (cp < ep) {
                        sa = (struct sockaddr *)cp;
                        if (sa->sa_len == dst->sa_len &&
                            memcmp(sa, dst, sa->sa_len) == 0)
                                break;
                        cp += RT_XROUNDUP(sa->sa_len);
                }
                if (cp == ep)
                        return EEXIST;
        }

        /* Passed the filter. */
        return 0;
}

static void
rt_pr_init(void)
{

        LIST_INIT(&rt_rawcb);
}

static int
COMPATNAME(route_attach)(struct socket *so, int proto)
{
        struct rawcb *rp;
        struct routecb *rop;
        int s, error;

        KASSERT(sotorawcb(so) == NULL);
        rop = kmem_zalloc(sizeof(*rop), KM_SLEEP);
        rp = &rop->rocb_rcb;
        rp->rcb_len = sizeof(*rop);
        so->so_pcb = rp;

        s = splsoftnet();

#ifdef NET_MPSAFE
        KASSERT(so->so_lock == NULL);
        mutex_obj_hold(rt_so_mtx);
        so->so_lock = rt_so_mtx;
        solock(so);
#endif

        if ((error = raw_attach(so, proto, &rt_rawcb)) == 0) {
                rt_adjustcount(rp->rcb_proto.sp_protocol, 1);
                rp->rcb_laddr = &COMPATNAME(route_info).ri_src;
                rp->rcb_faddr = &COMPATNAME(route_info).ri_dst;
                rp->rcb_filter = COMPATNAME(route_filter);
        }
        splx(s);

        if (error) {
                kmem_free(rop, sizeof(*rop));
                so->so_pcb = NULL;
                return error;
        }

        soisconnected(so);
        so->so_options |= SO_USELOOPBACK;
        KASSERT(solocked(so));

        return error;
}

static void
COMPATNAME(route_detach)(struct socket *so)
{
        struct rawcb *rp = sotorawcb(so);
        struct routecb *rop = (struct routecb *)rp;
        int s;

        KASSERT(rp != NULL);
        KASSERT(solocked(so));

        s = splsoftnet();
        if (rop->rocb_missfilterlen != 0)
                kmem_free(rop->rocb_missfilter, rop->rocb_missfilterlen);
        rt_adjustcount(rp->rcb_proto.sp_protocol, -1);
        raw_detach(so);
        splx(s);
}

static int
COMPATNAME(route_accept)(struct socket *so, struct sockaddr *nam)
{
        KASSERT(solocked(so));

        panic("route_accept");

        return EOPNOTSUPP;
}

static int
COMPATNAME(route_bind)(struct socket *so, struct sockaddr *nam, struct lwp *l)
{
        KASSERT(solocked(so));

        return EOPNOTSUPP;
}

static int
COMPATNAME(route_listen)(struct socket *so, struct lwp *l)
{
        KASSERT(solocked(so));

        return EOPNOTSUPP;
}

static int
COMPATNAME(route_connect)(struct socket *so, struct sockaddr *nam, struct lwp *l)
{
        KASSERT(solocked(so));

        return EOPNOTSUPP;
}

static int
COMPATNAME(route_connect2)(struct socket *so, struct socket *so2)
{
        KASSERT(solocked(so));

        return EOPNOTSUPP;
}

static int
COMPATNAME(route_disconnect)(struct socket *so)
{
        struct rawcb *rp = sotorawcb(so);
        int s;

        KASSERT(solocked(so));
        KASSERT(rp != NULL);

        s = splsoftnet();
        soisdisconnected(so);
        raw_disconnect(rp);
        splx(s);

        return 0;
}

static int
COMPATNAME(route_shutdown)(struct socket *so)
{
        int s;

        KASSERT(solocked(so));

        /*
         * Mark the connection as being incapable of further input.
         */
        s = splsoftnet();
        socantsendmore(so);
        splx(s);
        return 0;
}

static int
COMPATNAME(route_abort)(struct socket *so)
{
        KASSERT(solocked(so));

        panic("route_abort");

        return EOPNOTSUPP;
}

static int
COMPATNAME(route_ioctl)(struct socket *so, u_long cmd, void *nam,
    struct ifnet * ifp)
{
        return EOPNOTSUPP;
}

static int
COMPATNAME(route_stat)(struct socket *so, struct stat *ub)
{
        KASSERT(solocked(so));

        return 0;
}

static int
COMPATNAME(route_peeraddr)(struct socket *so, struct sockaddr *nam)
{
        struct rawcb *rp = sotorawcb(so);

        KASSERT(solocked(so));
        KASSERT(rp != NULL);
        KASSERT(nam != NULL);

        if (rp->rcb_faddr == NULL)
                return ENOTCONN;

        raw_setpeeraddr(rp, nam);
        return 0;
}

static int
COMPATNAME(route_sockaddr)(struct socket *so, struct sockaddr *nam)
{
        struct rawcb *rp = sotorawcb(so);

        KASSERT(solocked(so));
        KASSERT(rp != NULL);
        KASSERT(nam != NULL);

        if (rp->rcb_faddr == NULL)
                return ENOTCONN;

        raw_setsockaddr(rp, nam);
        return 0;
}

static int
COMPATNAME(route_rcvd)(struct socket *so, int flags, struct lwp *l)
{
        KASSERT(solocked(so));

        return EOPNOTSUPP;
}

static int
COMPATNAME(route_recvoob)(struct socket *so, struct mbuf *m, int flags)
{
        KASSERT(solocked(so));

        return EOPNOTSUPP;
}

static int
COMPATNAME(route_send)(struct socket *so, struct mbuf *m,
    struct sockaddr *nam, struct mbuf *control, struct lwp *l)
{
        int error = 0;
        int s;

        KASSERT(solocked(so));
        KASSERT(so->so_proto == &COMPATNAME(route_protosw)[0]);

        s = splsoftnet();
        error = raw_send(so, m, nam, control, l, &COMPATNAME(route_output));
        splx(s);

        return error;
}

static int
COMPATNAME(route_sendoob)(struct socket *so, struct mbuf *m,
    struct mbuf *control)
{
        KASSERT(solocked(so));

        m_freem(m);
        m_freem(control);

        return EOPNOTSUPP;
}
static int
COMPATNAME(route_purgeif)(struct socket *so, struct ifnet *ifp)
{

        panic("route_purgeif");

        return EOPNOTSUPP;
}

#if defined(INET) || defined(INET6)
static int
route_get_sdl_index(struct rt_addrinfo *info, int *sdl_index)
{
        struct rtentry *nrt;
        int error;

        error = rtrequest1(RTM_GET, info, &nrt);
        if (error != 0)
                return error;
        /*
         * nrt->rt_ifp->if_index may not be correct
         * due to changing to ifplo0.
         */
        *sdl_index = satosdl(nrt->rt_gateway)->sdl_index;
        rt_unref(nrt);

        return 0;
}
#endif

static void
route_get_sdl(const struct ifnet *ifp, const struct sockaddr *dst,
    struct sockaddr_dl *sdl, int *flags)
{
        struct llentry *la;

        KASSERT(ifp != NULL);

        IF_AFDATA_RLOCK(ifp);
        switch (dst->sa_family) {
        case AF_INET:
                la = lla_lookup(LLTABLE(ifp), 0, dst);
                break;
        case AF_INET6:
                la = lla_lookup(LLTABLE6(ifp), 0, dst);
                break;
        default:
                la = NULL;
                KASSERTMSG(0, "Invalid AF=%d\n", dst->sa_family);
                break;
        }
        IF_AFDATA_RUNLOCK(ifp);

        void *a = (LLE_IS_VALID(la) && (la->la_flags & LLE_VALID) == LLE_VALID)
            ? &la->ll_addr : NULL;

        a = sockaddr_dl_init(sdl, sizeof(*sdl), ifp->if_index, ifp->if_type,
            NULL, 0, a, ifp->if_addrlen);
        KASSERT(a != NULL);

        if (la != NULL) {
                *flags = la->la_flags;
                LLE_RUNLOCK(la);
        }
}

static int
route_output_report(struct rtentry *rt, struct rt_addrinfo *info,
    struct rt_xmsghdr *rtm, struct rt_xmsghdr **new_rtm)
{
        int len, error;

        if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
                const struct ifaddr *rtifa;
                const struct ifnet *ifp = rt->rt_ifp;

                info->rti_info[RTAX_IFP] = ifp->if_dl->ifa_addr;
                /* rtifa used to be simply rt->rt_ifa.
                 * If rt->rt_ifa != NULL, then
                 * rt_get_ifa() != NULL.  So this
                 * ought to still be safe. --dyoung
                 */
                rtifa = rt_get_ifa(rt);
                info->rti_info[RTAX_IFA] = rtifa->ifa_addr;
#ifdef RTSOCK_DEBUG
                if (info->rti_info[RTAX_IFA]->sa_family == AF_INET) {
                        char ibuf[INET_ADDRSTRLEN];
                        char abuf[INET_ADDRSTRLEN];
                        printf("%s: copying out RTAX_IFA %s "
                            "for info->rti_info[RTAX_DST] %s "
                            "ifa_getifa %p ifa_seqno %p\n",
                            __func__,
                            RT_IN_PRINT(info, ibuf, RTAX_IFA),
                            RT_IN_PRINT(info, abuf, RTAX_DST),
                            (void *)rtifa->ifa_getifa,
                            rtifa->ifa_seqno);
                }
#endif /* RTSOCK_DEBUG */
                if (ifp->if_flags & IFF_POINTOPOINT)
                        info->rti_info[RTAX_BRD] = rtifa->ifa_dstaddr;
                else
                        info->rti_info[RTAX_BRD] = NULL;
                rtm->rtm_index = ifp->if_index;
        }
        error = rt_msg2(rtm->rtm_type, info, NULL, NULL, &len);
        if (error)
                return error;
        if (len > rtm->rtm_msglen) {
                struct rt_xmsghdr *old_rtm = rtm;
                R_Malloc(*new_rtm, struct rt_xmsghdr *, len);
                if (*new_rtm == NULL)
                        return ENOBUFS;
                (void)memcpy(*new_rtm, old_rtm, old_rtm->rtm_msglen);
                rtm = *new_rtm;
        }
        (void)rt_msg2(rtm->rtm_type, info, rtm, NULL, 0);
        rtm->rtm_flags = rt->rt_flags;
        rtm_setmetrics(rt, rtm);
        rtm->rtm_addrs = info->rti_addrs;

        return 0;
}

/*ARGSUSED*/
int
COMPATNAME(route_output)(struct mbuf *m, struct socket *so)
{
        struct sockproto proto = { .sp_family = PF_XROUTE, };
        struct rt_xmsghdr hdr;
        struct rt_xmsghdr *rtm = NULL;
        struct rt_xmsghdr *old_rtm = NULL, *new_rtm = NULL;
        struct rtentry *rt = NULL;
        struct rtentry *saved_nrt = NULL;
        struct rt_addrinfo info;
        int len, error = 0;
        sa_family_t family;
        struct sockaddr_dl sdl;
        int bound = curlwp_bind();
        bool do_rt_free = false;
        struct sockaddr_storage netmask;

#define senderr(e) do { error = e; goto flush;} while (/*CONSTCOND*/ 0)
        if (m == NULL || ((m->m_len < sizeof(int32_t)) &&
           (m = m_pullup(m, sizeof(int32_t))) == NULL)) {
                error = ENOBUFS;
                goto out;
        }
        if ((m->m_flags & M_PKTHDR) == 0)
                panic("%s", __func__);
        len = m->m_pkthdr.len;
        if (len < sizeof(*rtm)) {
                info.rti_info[RTAX_DST] = NULL;
                senderr(EINVAL);
        }
        m_copydata(m, 0, sizeof(hdr), &hdr);
        if (len != hdr.rtm_msglen) {
                info.rti_info[RTAX_DST] = NULL;
                senderr(EINVAL);
        }
        R_Malloc(rtm, struct rt_xmsghdr *, len);
        if (rtm == NULL) {
                info.rti_info[RTAX_DST] = NULL;
                senderr(ENOBUFS);
        }
        m_copydata(m, 0, len, rtm);
        if (rtm->rtm_version != RTM_XVERSION) {
                info.rti_info[RTAX_DST] = NULL;
                senderr(EPROTONOSUPPORT);
        }
        rtm->rtm_pid = curproc->p_pid;
        memset(&info, 0, sizeof(info));
        info.rti_addrs = rtm->rtm_addrs;
        if (rt_xaddrs(rtm->rtm_type, (const char *)(rtm + 1), len + (char *)rtm,
            &info)) {
                senderr(EINVAL);
        }
        info.rti_flags = rtm->rtm_flags;
        if (info.rti_info[RTAX_DST] == NULL ||
            (info.rti_info[RTAX_DST]->sa_family >= AF_MAX)) {
                senderr(EINVAL);
        }
#ifdef RTSOCK_DEBUG
        if (info.rti_info[RTAX_DST]->sa_family == AF_INET) {
                char abuf[INET_ADDRSTRLEN];
                printf("%s: extracted info.rti_info[RTAX_DST] %s\n", __func__,
                    RT_IN_PRINT(&info, abuf, RTAX_DST));
        }
#endif /* RTSOCK_DEBUG */
        if (info.rti_info[RTAX_GATEWAY] != NULL &&
            (info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX)) {
                senderr(EINVAL);
        }

        /*
         * Verify that the socket has the appropriate privilege; RTM_GET
         * is the only operation the non-superuser is allowed.
         */
        if (kauth_authorize_network(so->so_cred, KAUTH_NETWORK_ROUTE,
            0, rtm, NULL, NULL) != 0)
                senderr(EACCES);

        /*
         * route(8) passes a sockaddr truncated with prefixlen.
         * The kernel doesn't expect such sockaddr and need to 
         * use a buffer that is big enough for the sockaddr expected
         * (padded with 0's). We keep the original length of the sockaddr.
         */
        if (info.rti_info[RTAX_NETMASK]) {
                /*
                 * Use the family of RTAX_DST, because RTAX_NETMASK
                 * can have a zero family if it comes from the radix
                 * tree via rt_mask().
                 */
                socklen_t sa_len = sockaddr_getsize_by_family(
                    info.rti_info[RTAX_DST]->sa_family);
                socklen_t masklen = sockaddr_getlen(
                    info.rti_info[RTAX_NETMASK]);
                if (sa_len != 0 && sa_len > masklen) {
                        KASSERT(sa_len <= sizeof(netmask));
                        memcpy(&netmask, info.rti_info[RTAX_NETMASK], masklen);
                        memset((char *)&netmask + masklen, 0, sa_len - masklen);
                        info.rti_info[RTAX_NETMASK] = sstocsa(&netmask);
                }
        }

        switch (rtm->rtm_type) {

        case RTM_ADD:
                if (info.rti_info[RTAX_GATEWAY] == NULL) {
                        senderr(EINVAL);
                }
#if defined(INET) || defined(INET6)
                /* support for new ARP/NDP code with keeping backcompat */
                if (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) {
                        const struct sockaddr_dl *sdlp =
                            satocsdl(info.rti_info[RTAX_GATEWAY]);

                        /* Allow routing requests by interface index */
                        if (sdlp->sdl_nlen == 0 && sdlp->sdl_alen == 0
                            && sdlp->sdl_slen == 0)
                                goto fallback;
                        /*
                         * Old arp binaries don't set the sdl_index
                         * so we have to complement it.
                         */
                        int sdl_index = sdlp->sdl_index;
                        if (sdl_index == 0) {
                                error = route_get_sdl_index(&info, &sdl_index);
                                if (error != 0)
                                        goto fallback;
                        } else if (
                            info.rti_info[RTAX_DST]->sa_family == AF_INET) {
                                /*
                                 * XXX workaround for SIN_PROXY case; proxy arp
                                 * entry should be in an interface that has
                                 * a network route including the destination,
                                 * not a local (link) route that may not be a
                                 * desired place, for example a tap.
                                 */
                                const struct sockaddr_inarp *sina =
                                    (const struct sockaddr_inarp *)
                                    info.rti_info[RTAX_DST];
                                if (sina->sin_other & SIN_PROXY) {
                                        error = route_get_sdl_index(&info,
                                            &sdl_index);
                                        if (error != 0)
                                                goto fallback;
                                }
                        }
                        error = lla_rt_output(rtm->rtm_type, rtm->rtm_flags,
                            rtm->rtm_rmx.rmx_expire, &info, sdl_index);
                        break;
                }
        fallback:
#endif /* defined(INET) || defined(INET6) */
                error = rtrequest1(rtm->rtm_type, &info, &saved_nrt);
                if (error == 0) {
                        _rt_setmetrics(rtm->rtm_inits, rtm, saved_nrt);
                        rt_unref(saved_nrt);
                }
                break;

        case RTM_DELETE:
#if defined(INET) || defined(INET6)
                /* support for new ARP/NDP code */
                if (info.rti_info[RTAX_GATEWAY] &&
                    (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) &&
                    (rtm->rtm_flags & RTF_LLDATA) != 0) {
                        const struct sockaddr_dl *sdlp =
                            satocsdl(info.rti_info[RTAX_GATEWAY]);
                        error = lla_rt_output(rtm->rtm_type, rtm->rtm_flags,
                            rtm->rtm_rmx.rmx_expire, &info, sdlp->sdl_index);
                        rtm->rtm_flags &= ~RTF_UP;
                        break;
                }
#endif
                error = rtrequest1(rtm->rtm_type, &info, &saved_nrt);
                if (error != 0)
                        break;

                rt = saved_nrt;
                do_rt_free = true;
                info.rti_info[RTAX_DST] = rt_getkey(rt);
                info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
                info.rti_info[RTAX_NETMASK] = rt_mask(rt);
                info.rti_info[RTAX_TAG] = rt_gettag(rt);
                error = route_output_report(rt, &info, rtm, &new_rtm);
                if (error)
                        senderr(error);
                if (new_rtm != NULL) {
                        old_rtm = rtm;
                        rtm = new_rtm;
                }
                break;

        case RTM_GET:
        case RTM_CHANGE:
        case RTM_LOCK:
                /* XXX This will mask info.rti_info[RTAX_DST] with
                 * info.rti_info[RTAX_NETMASK] before
                 * searching.  It did not used to do that.  --dyoung
                 */
                rt = NULL;
                error = rtrequest1(RTM_GET, &info, &rt);
                if (error != 0)
                        senderr(error);
                if (rtm->rtm_type != RTM_GET) {/* XXX: too grotty */
                        if (memcmp(info.rti_info[RTAX_DST], rt_getkey(rt),
                            info.rti_info[RTAX_DST]->sa_len) != 0)
                                senderr(ESRCH);
                        if (info.rti_info[RTAX_NETMASK] == NULL &&
                            rt_mask(rt) != NULL)
                                senderr(ETOOMANYREFS);
                }

                /*
                 * XXX if arp/ndp requests an L2 entry, we have to obtain
                 * it from lltable while for the route command we have to
                 * return a route as it is. How to distinguish them?
                 * For newer arp/ndp, RTF_LLDATA flag set by arp/ndp
                 * indicates an L2 entry is requested. For old arp/ndp
                 * binaries, we check RTF_UP flag is NOT set; it works
                 * by the fact that arp/ndp don't set it while the route
                 * command sets it.
                 */
                if (((rtm->rtm_flags & RTF_LLDATA) != 0 ||
                     (rtm->rtm_flags & RTF_UP) == 0) &&
                    rtm->rtm_type == RTM_GET &&
                    sockaddr_cmp(rt_getkey(rt), info.rti_info[RTAX_DST]) != 0) {
                        int ll_flags = 0;
                        route_get_sdl(rt->rt_ifp, info.rti_info[RTAX_DST], &sdl,
                            &ll_flags);
                        info.rti_info[RTAX_GATEWAY] = sstocsa(&sdl);
                        error = route_output_report(rt, &info, rtm, &new_rtm);
                        if (error)
                                senderr(error);
                        if (new_rtm != NULL) {
                                old_rtm = rtm;
                                rtm = new_rtm;
                        }
                        rtm->rtm_flags |= RTF_LLDATA;
                        rtm->rtm_flags &= ~RTF_CONNECTED;
                        rtm->rtm_flags |= (ll_flags & LLE_STATIC) ? RTF_STATIC : 0;
                        break;
                }

                switch (rtm->rtm_type) {
                case RTM_GET:
                        info.rti_info[RTAX_DST] = rt_getkey(rt);
                        info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
                        info.rti_info[RTAX_NETMASK] = rt_mask(rt);
                        info.rti_info[RTAX_TAG] = rt_gettag(rt);
                        error = route_output_report(rt, &info, rtm, &new_rtm);
                        if (error)
                                senderr(error);
                        if (new_rtm != NULL) {
                                old_rtm = rtm;
                                rtm = new_rtm;
                        }
                        break;

                case RTM_CHANGE:
#ifdef NET_MPSAFE
                        /*
                         * Release rt_so_mtx to avoid a deadlock with route_intr
                         * and also serialize updating routes to avoid another.
                         */
                        if (rt_updating) {
                                /* Release to allow the updater to proceed */
                                rt_unref(rt);
                                rt = NULL;
                        }
                        while (rt_updating) {
                                error = cv_wait_sig(&rt_update_cv, rt_so_mtx);
                                if (error != 0)
                                        goto flush;
                        }
                        if (rt == NULL) {
                                error = rtrequest1(RTM_GET, &info, &rt);
                                if (error != 0)
                                        goto flush;
                        }
                        rt_updating = true;
                        mutex_exit(rt_so_mtx);

                        error = rt_update_prepare(rt);
                        if (error == 0) {
                                error = rt_update(rt, &info, rtm);
                                rt_update_finish(rt);
                        }

                        mutex_enter(rt_so_mtx);
                        rt_updating = false;
                        cv_broadcast(&rt_update_cv);
#else
                        error = rt_update(rt, &info, rtm);
#endif
                        if (error != 0)
                                goto flush;
                        /*FALLTHROUGH*/
                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;
        }
        family = info.rti_info[RTAX_DST] ? info.rti_info[RTAX_DST]->sa_family :
            0;
        /* We cannot free old_rtm until we have stopped using the
         * pointers in info, some of which may point to sockaddrs
         * in old_rtm.
         */
        if (old_rtm != NULL)
                Free(old_rtm);
        if (rt) {
                if (do_rt_free) {
#ifdef NET_MPSAFE
                        /*
                         * Release rt_so_mtx to avoid a deadlock with
                         * route_intr.
                         */
                        mutex_exit(rt_so_mtx);
                        rt_free(rt);
                        mutex_enter(rt_so_mtx);
#else
                        rt_free(rt);
#endif
                } else
                        rt_unref(rt);
        }
    {
        struct rawcb *rp = NULL;
        /*
         * Check to see if we don't want our own messages.
         */
        if ((so->so_options & SO_USELOOPBACK) == 0) {
                if (COMPATNAME(route_info).ri_cb.any_count <= 1) {
                        if (rtm)
                                Free(rtm);
                        m_freem(m);
                        goto out;
                }
                /* There is another listener, so construct message */
                rp = sotorawcb(so);
        }
        if (rtm) {
                m_copyback(m, 0, rtm->rtm_msglen, 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);
                Free(rtm);
        }
        if (rp)
                rp->rcb_proto.sp_family = 0; /* Avoid us */
        if (family)
                proto.sp_protocol = family;
        if (m)
                raw_input(m, &proto, &COMPATNAME(route_info).ri_src,
                    &COMPATNAME(route_info).ri_dst, &rt_rawcb);
        if (rp)
                rp->rcb_proto.sp_family = PF_XROUTE;
    }
out:
        curlwp_bindx(bound);
        return error;
}

static int
route_ctloutput(int op, struct socket *so, struct sockopt *sopt)
{
        struct routecb *rop = sotoroutecb(so);
        int error = 0;
        unsigned char *rtm_type, *cp, *ep;
        size_t len;
        unsigned int msgfilter;
        struct sockaddr *sa;

        KASSERT(solocked(so));

        if (sopt->sopt_level != AF_ROUTE) {
                error = ENOPROTOOPT;
        } else switch (op) {
        case PRCO_SETOPT:
                switch (sopt->sopt_name) {
                case RO_MSGFILTER:
                        msgfilter = 0;
                        for (rtm_type = sopt->sopt_data, len = sopt->sopt_size;
                             len != 0;
                             rtm_type++, len -= sizeof(*rtm_type))
                        {
                                /* Guard against overflowing our storage. */
                                if (*rtm_type >= sizeof(msgfilter) * CHAR_BIT) {
                                        error = EOVERFLOW;
                                        break;
                                }
                                msgfilter |= RTMSGFILTER(*rtm_type);
                        }
                        if (error == 0)
                                rop->rocb_msgfilter = msgfilter;
                        break;
                case RO_MISSFILTER:
                        /* Validate the data */
                        len = 0;
                        cp = sopt->sopt_data;
                        ep = cp + sopt->sopt_size;
                        while (cp < ep) {
                                if (ep - cp <
                                    offsetof(struct sockaddr, sa_len) +
                                    sizeof(sa->sa_len))
                                        break;
                                if (++len > RO_FILTSA_MAX) {
                                        error = ENOBUFS;
                                        break;
                                }
                                sa = (struct sockaddr *)cp;
                                if (sa->sa_len < _SA_MINSIZE ||
                                    sa->sa_len >sizeof(struct sockaddr_storage))
                                        return EINVAL;
                                cp += RT_XROUNDUP(sa->sa_len);
                        }
                        if (cp != ep) {
                                if (error == 0)
                                        error = EINVAL;
                                break;
                        }
                        if (rop->rocb_missfilterlen != 0)
                                kmem_free(rop->rocb_missfilter,
                                    rop->rocb_missfilterlen);
                        if (sopt->sopt_size != 0) {
                                rop->rocb_missfilter =
                                    kmem_alloc(sopt->sopt_size, KM_SLEEP);
                                if (rop->rocb_missfilter == NULL) {
                                        rop->rocb_missfilterlen = 0;
                                        error = ENOBUFS;
                                        break;
                                }
                        } else
                                rop->rocb_missfilter = NULL;
                        rop->rocb_missfilterlen = sopt->sopt_size;
                        if (rop->rocb_missfilterlen != 0)
                                memcpy(rop->rocb_missfilter, sopt->sopt_data,
                                    rop->rocb_missfilterlen);
                        break;
                default:
                        error = ENOPROTOOPT;
                        break;
                }
                break;
        case PRCO_GETOPT:
                switch (sopt->sopt_name) {
                case RO_MSGFILTER:
                        error = ENOTSUP;
                        break;
                default:
                        error = ENOPROTOOPT;
                        break;
                }
        }
        return error;
}

static void
_rt_setmetrics(int which, const struct rt_xmsghdr *in, struct rtentry *out)
{
#define metric(f, e) if (which & (f)) out->rt_rmx.e = in->rtm_rmx.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);
#undef metric
        if (which & RTV_EXPIRE) {
                out->rt_rmx.rmx_expire = in->rtm_rmx.rmx_expire ?
                    time_wall_to_mono(in->rtm_rmx.rmx_expire) : 0;
        }
}

static void
rtm_setmetrics(const struct rtentry *in, struct rt_xmsghdr *out)
{
#define metric(e) out->rtm_rmx.e = in->rt_rmx.e;
        metric(rmx_recvpipe);
        metric(rmx_sendpipe);
        metric(rmx_ssthresh);
        metric(rmx_rtt);
        metric(rmx_rttvar);
        metric(rmx_hopcount);
        metric(rmx_mtu);
        metric(rmx_locks);
#undef metric
        out->rtm_rmx.rmx_expire = in->rt_rmx.rmx_expire ?
            time_mono_to_wall(in->rt_rmx.rmx_expire) : 0;
}

static int
rt_xaddrs(u_char rtmtype, const char *cp, const char *cplim,
    struct rt_addrinfo *rtinfo)
{
        const struct sockaddr *sa = NULL;       /* Quell compiler warning */
        int i;

        for (i = 0; i < RTAX_MAX && cp < cplim; i++) {
                if ((rtinfo->rti_addrs & (1 << i)) == 0)
                        continue;
                rtinfo->rti_info[i] = sa = (const struct sockaddr *)cp;
                RT_XADVANCE(cp, sa);
        }

        /*
         * Check for extra addresses specified, except RTM_GET asking
         * for interface info.
         */
        if (rtmtype == RTM_GET) {
                if (((rtinfo->rti_addrs &
                    (~((1 << RTAX_IFP) | (1 << RTAX_IFA)))) & (~0U << i)) != 0)
                        return 1;
        } else if ((rtinfo->rti_addrs & (~0U << i)) != 0)
                return 1;
        /* Check for bad data length.  */
        if (cp != cplim) {
                if (i == RTAX_NETMASK + 1 && sa != NULL &&
                    cp - RT_XROUNDUP(sa->sa_len) + sa->sa_len == cplim)
                        /*
                         * The last sockaddr was info.rti_info[RTAX_NETMASK].
                         * We accept this for now for the sake of old
                         * binaries or third party softwares.
                         */
                        ;
                else
                        return 1;
        }
        return 0;
}

static int
rt_getlen(int type)
{
        RTS_CTASSERT(__alignof(struct ifa_msghdr) >= sizeof(uint64_t));
        RTS_CTASSERT(__alignof(struct if_msghdr) >= sizeof(uint64_t));
        RTS_CTASSERT(__alignof(struct if_announcemsghdr) >= sizeof(uint64_t));
        RTS_CTASSERT(__alignof(struct rt_msghdr) >= sizeof(uint64_t));

        switch (type) {
        case RTM_ODELADDR:
        case RTM_ONEWADDR:
        case RTM_OCHGADDR:
                if (rtsock_iflist_70_hook.hooked)
                        return sizeof(struct ifa_msghdr70);
                else {
#ifdef RTSOCK_DEBUG
                        printf("%s: unsupported RTM type %d\n", __func__, type);
#endif
                        return -1;
                }

        case RTM_DELADDR:
        case RTM_NEWADDR:
        case RTM_CHGADDR:
                return sizeof(struct ifa_xmsghdr);

        case RTM_OOIFINFO:
                if (rtsock_iflist_14_hook.hooked)
                        return sizeof(struct if_msghdr14);
                else {
#ifdef RTSOCK_DEBUG
                        printf("%s: unsupported RTM type RTM_OOIFINFO\n",
                            __func__);
#endif
                        return -1;
                }

        case RTM_OIFINFO:
                if (rtsock_iflist_50_hook.hooked)
                        return sizeof(struct if_msghdr50);
                else {
#ifdef RTSOCK_DEBUG
                        printf("%s: unsupported RTM type RTM_OIFINFO\n",
                            __func__);
#endif
                        return -1;
                }

        case RTM_IFINFO:
                return sizeof(struct if_xmsghdr);

        case RTM_IFANNOUNCE:
        case RTM_IEEE80211:
                return sizeof(struct if_xannouncemsghdr);

        default:
                return sizeof(struct rt_xmsghdr);
        }
}


struct mbuf *
COMPATNAME(rt_msg1)(int type, struct rt_addrinfo *rtinfo, void *data, int datalen)
{
        struct rt_xmsghdr *rtm;
        struct mbuf *m;
        int i;
        const struct sockaddr *sa;
        int len, dlen;

        m = m_gethdr(M_DONTWAIT, MT_DATA);
        if (m == NULL)
                return m;
        MCLAIM(m, &COMPATNAME(routedomain).dom_mowner);

        if ((len = rt_getlen(type)) == -1)
                goto out;
        if (len > MHLEN + MLEN)
                panic("%s: message too long", __func__);
        else if (len > MHLEN) {
                m->m_next = m_get(M_DONTWAIT, MT_DATA);
                if (m->m_next == NULL)
                        goto out;
                MCLAIM(m->m_next, m->m_owner);
                m->m_pkthdr.len = len;
                m->m_len = MHLEN;
                m->m_next->m_len = len - MHLEN;
        } else {
                m->m_pkthdr.len = m->m_len = len;
        }
        m_reset_rcvif(m);
        m_copyback(m, 0, datalen, data);
        if (len > datalen)
                (void)memset(mtod(m, char *) + datalen, 0, len - datalen);
        rtm = mtod(m, struct rt_xmsghdr *);
        for (i = 0; i < RTAX_MAX; i++) {
                if ((sa = rtinfo->rti_info[i]) == NULL)
                        continue;
                rtinfo->rti_addrs |= (1 << i);
                dlen = RT_XROUNDUP(sa->sa_len);
                m_copyback(m, len, sa->sa_len, sa);
                if (dlen != sa->sa_len) {
                        /*
                         * Up to 7 + 1 nul's since roundup is to
                         * sizeof(uint64_t) (8 bytes)
                         */
                        m_copyback(m, len + sa->sa_len,
                            dlen - sa->sa_len, "\0\0\0\0\0\0\0");
                }
                len += dlen;
        }
        if (m->m_pkthdr.len != len)
                goto out;
        rtm->rtm_msglen = len;
        rtm->rtm_version = RTM_XVERSION;
        rtm->rtm_type = type;
        return m;
out:
        m_freem(m);
        return NULL;
}

/*
 * rt_msg2
 *
 *       fills 'cp' or 'w'.w_tmem with the routing socket message and
 *              returns the length of the message in 'lenp'.
 *
 * if walkarg is 0, cp is expected to be 0 or a buffer large enough to hold
 *      the message
 * otherwise walkarg's w_needed is updated and if the user buffer is
 *      specified and w_needed indicates space exists the information is copied
 *      into the temp space (w_tmem). w_tmem is [re]allocated if necessary,
 *      if the allocation fails ENOBUFS is returned.
 */
static int
rt_msg2(int type, struct rt_addrinfo *rtinfo, void *cpv, struct rt_walkarg *w,
        int *lenp)
{
        int i;
        int len, dlen, second_time = 0;
        char *cp0, *cp = cpv;

        rtinfo->rti_addrs = 0;
again:
        if ((len = rt_getlen(type)) == -1)
                return EINVAL;

        if ((cp0 = cp) != NULL)
                cp += len;
        for (i = 0; i < RTAX_MAX; i++) {
                const struct sockaddr *sa;

                if ((sa = rtinfo->rti_info[i]) == NULL)
                        continue;
                rtinfo->rti_addrs |= (1 << i);
                dlen = RT_XROUNDUP(sa->sa_len);
                if (cp) {
                        int diff = dlen - sa->sa_len;
                        (void)memcpy(cp, sa, (size_t)sa->sa_len);
                        cp += sa->sa_len;
                        if (diff > 0) {
                                (void)memset(cp, 0, (size_t)diff);
                                cp += diff;
                        }
                }
                len += dlen;
        }
        if (cp == NULL && w != NULL && !second_time) {
                struct rt_walkarg *rw = w;

                rw->w_needed += len;
                if (rw->w_needed <= 0 && rw->w_where) {
                        if (rw->w_tmemsize < len) {
                                if (rw->w_tmem)
                                        kmem_free(rw->w_tmem, rw->w_tmemsize);
                                rw->w_tmem = kmem_zalloc(len, KM_SLEEP);
                                rw->w_tmemsize = len;
                        }
                        if (rw->w_tmem) {
                                cp = rw->w_tmem;
                                second_time = 1;
                                goto again;
                        } else {
                                rw->w_tmemneeded = len;
                                return ENOBUFS;
                        }
                }
        }
        if (cp) {
                struct rt_xmsghdr *rtm = (struct rt_xmsghdr *)cp0;

                rtm->rtm_version = RTM_XVERSION;
                rtm->rtm_type = type;
                rtm->rtm_msglen = len;
        }
        if (lenp)
                *lenp = len;
        return 0;
}

/*
 * 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
COMPATNAME(rt_missmsg)(int type, const struct rt_addrinfo *rtinfo, int flags,
    int error)
{
        struct rt_xmsghdr rtm;
        struct mbuf *m;
        const struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];
        struct rt_addrinfo info = *rtinfo;

        COMPATCALL(rt_missmsg, (type, rtinfo, flags, error));
        if (COMPATNAME(route_info).ri_cb.any_count == 0)
                return;
        memset(&rtm, 0, sizeof(rtm));
        rtm.rtm_pid = curproc->p_pid;
        rtm.rtm_flags = RTF_DONE | flags;
        rtm.rtm_errno = error;
        m = COMPATNAME(rt_msg1)(type, &info, &rtm, sizeof(rtm));
        if (m == NULL)
                return;
        mtod(m, struct rt_xmsghdr *)->rtm_addrs = info.rti_addrs;
        COMPATNAME(route_enqueue)(m, sa ? sa->sa_family : 0);
}

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

        COMPATCALL(rt_ifmsg, (ifp));
        if (COMPATNAME(route_info).ri_cb.any_count == 0)
                return;
        (void)memset(&info, 0, sizeof(info));
        (void)memset(&ifm, 0, sizeof(ifm));
        ifm.ifm_index = ifp->if_index;
        ifm.ifm_flags = ifp->if_flags;
        if_export_if_data(ifp, &ifm.ifm_data, false);
        ifm.ifm_addrs = 0;
        m = COMPATNAME(rt_msg1)(RTM_IFINFO, &info, &ifm, sizeof(ifm));
        if (m == NULL)
                return;
        COMPATNAME(route_enqueue)(m, 0);
        MODULE_HOOK_CALL_VOID(rtsock_oifmsg_14_hook, (ifp), __nothing);
        MODULE_HOOK_CALL_VOID(rtsock_oifmsg_50_hook, (ifp), __nothing);
}

/*
 * 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.
 */
static void
COMPATNAME(rt_addrmsg0)(int cmd, struct ifaddr *ifa, int error,
    struct rtentry *rt, const struct sockaddr *src)
{
#define cmdpass(__cmd, __pass)  (((__cmd) << 2) | (__pass))
        struct rt_addrinfo info;
        const struct sockaddr *sa;
        int pass;
        struct mbuf *m;
        struct ifnet *ifp;
        struct rt_xmsghdr rtm;
        struct ifa_xmsghdr ifam;
        int ncmd;

        KASSERT(ifa != NULL);
        KASSERT(ifa->ifa_addr != NULL);
        ifp = ifa->ifa_ifp;
        if (cmd == RTM_ADD && vec_sctp_add_ip_address != NULL) {
                (*vec_sctp_add_ip_address)(ifa);
        } else if (cmd == RTM_DELETE && vec_sctp_delete_ip_address != NULL) {
                (*vec_sctp_delete_ip_address)(ifa);
        }

        COMPATCALL(rt_addrmsg_rt, (cmd, ifa, error, rt));
        if (COMPATNAME(route_info).ri_cb.any_count == 0)
                return;
        for (pass = 1; pass < 3; pass++) {
                memset(&info, 0, sizeof(info));
                switch (cmdpass(cmd, pass)) {
                case cmdpass(RTM_ADD, 1):
                case cmdpass(RTM_CHANGE, 1):
                case cmdpass(RTM_DELETE, 2):
                case cmdpass(RTM_NEWADDR, 1):
                case cmdpass(RTM_DELADDR, 1):
                case cmdpass(RTM_CHGADDR, 1):
                        switch (cmd) {
                        case RTM_ADD:
                                ncmd = RTM_XNEWADDR;
                                break;
                        case RTM_DELETE:
                                ncmd = RTM_XDELADDR;
                                break;
                        case RTM_CHANGE:
                                ncmd = RTM_XCHGADDR;
                                break;
                        case RTM_NEWADDR:
                                ncmd = RTM_XNEWADDR;
                                break;
                        case RTM_DELADDR:
                                ncmd = RTM_XDELADDR;
                                break;
                        case RTM_CHGADDR:
                                ncmd = RTM_XCHGADDR;
                                break;
                        default:
                                panic("%s: unknown command %d", __func__, cmd);
                        }
                        MODULE_HOOK_CALL_VOID(rtsock_newaddr_70_hook,
                            (ncmd, ifa), __nothing);
                        info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
                        KASSERT(ifp->if_dl != NULL);
                        info.rti_info[RTAX_IFP] = ifp->if_dl->ifa_addr;
                        info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
                        info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
                        info.rti_info[RTAX_AUTHOR] = src;
                        memset(&ifam, 0, sizeof(ifam));
                        ifam.ifam_index = ifp->if_index;
                        ifam.ifam_metric = ifa->ifa_metric;
                        ifam.ifam_flags = ifa->ifa_flags;
#ifndef COMPAT_RTSOCK
                        ifam.ifam_pid = curproc->p_pid;
                        ifam.ifam_addrflags = if_addrflags(ifa);
#endif
                        m = COMPATNAME(rt_msg1)(ncmd, &info, &ifam, sizeof(ifam));
                        if (m == NULL)
                                continue;
                        mtod(m, struct ifa_xmsghdr *)->ifam_addrs =
                            info.rti_addrs;
                        break;
                case cmdpass(RTM_ADD, 2):
                case cmdpass(RTM_CHANGE, 2):
                case cmdpass(RTM_DELETE, 1):
                        if (rt == NULL)
                                continue;
                        info.rti_info[RTAX_NETMASK] = rt_mask(rt);
                        info.rti_info[RTAX_DST] = sa = rt_getkey(rt);
                        info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
                        memset(&rtm, 0, sizeof(rtm));
                        rtm.rtm_pid = curproc->p_pid;
                        rtm.rtm_index = ifp->if_index;
                        rtm.rtm_flags |= rt->rt_flags;
                        rtm.rtm_errno = error;
                        m = COMPATNAME(rt_msg1)(cmd, &info, &rtm, sizeof(rtm));
                        if (m == NULL)
                                continue;
                        mtod(m, struct rt_xmsghdr *)->rtm_addrs = info.rti_addrs;
                        break;
                default:
                        continue;
                }
                KASSERTMSG(m != NULL, "called with wrong command");
                COMPATNAME(route_enqueue)(m, sa ? sa->sa_family : 0);
        }
#undef cmdpass
}

void
COMPATNAME(rt_addrmsg)(int cmd, struct ifaddr *ifa)
{

        COMPATNAME(rt_addrmsg0)(cmd, ifa, 0, NULL, NULL);
}

void
COMPATNAME(rt_addrmsg_rt)(int cmd, struct ifaddr *ifa, int error,
    struct rtentry *rt)
{

        COMPATNAME(rt_addrmsg0)(cmd, ifa, error, rt, NULL);
}

void
COMPATNAME(rt_addrmsg_src)(int cmd, struct ifaddr *ifa,
    const struct sockaddr *src)
{

        COMPATNAME(rt_addrmsg0)(cmd, ifa, 0, NULL, src);
}

static struct mbuf *
rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
    struct rt_addrinfo *info)
{
        struct if_xannouncemsghdr ifan;

        memset(info, 0, sizeof(*info));
        memset(&ifan, 0, sizeof(ifan));
        ifan.ifan_index = ifp->if_index;
        strlcpy(ifan.ifan_name, ifp->if_xname, sizeof(ifan.ifan_name));
        ifan.ifan_what = what;
        return COMPATNAME(rt_msg1)(type, info, &ifan, sizeof(ifan));
}

/*
 * This is called to generate routing socket messages indicating
 * network interface arrival and departure.
 */
void
COMPATNAME(rt_ifannouncemsg)(struct ifnet *ifp, int what)
{
        struct mbuf *m;
        struct rt_addrinfo info;

        COMPATCALL(rt_ifannouncemsg, (ifp, what));
        if (COMPATNAME(route_info).ri_cb.any_count == 0)
                return;
        m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info);
        if (m == NULL)
                return;
        COMPATNAME(route_enqueue)(m, 0);
}

/*
 * This is called to generate routing socket messages indicating
 * IEEE80211 wireless events.
 * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way.
 */
void
COMPATNAME(rt_ieee80211msg)(struct ifnet *ifp, int what, void *data,
        size_t data_len)
{
        struct mbuf *m;
        struct rt_addrinfo info;

        COMPATCALL(rt_ieee80211msg, (ifp, what, data, data_len));
        if (COMPATNAME(route_info).ri_cb.any_count == 0)
                return;
        m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info);
        if (m == NULL)
                return;
        /*
         * Append the ieee80211 data.  Try to stick it in the
         * mbuf containing the ifannounce msg; otherwise allocate
         * a new mbuf and append.
         *
         * NB: we assume m is a single mbuf.
         */
        if (data_len > M_TRAILINGSPACE(m)) {
                struct mbuf *n = m_get(M_NOWAIT, MT_DATA);
                if (n == NULL) {
                        m_freem(m);
                        return;
                }
                (void)memcpy(mtod(n, void *), data, data_len);
                n->m_len = data_len;
                m->m_next = n;
        } else if (data_len > 0) {
                (void)memcpy(mtod(m, uint8_t *) + m->m_len, data, data_len);
                m->m_len += data_len;
        }
        if (m->m_flags & M_PKTHDR)
                m->m_pkthdr.len += data_len;
        mtod(m, struct if_xannouncemsghdr *)->ifan_msglen += data_len;
        COMPATNAME(route_enqueue)(m, 0);
}

/*
 * Routing message software interrupt routine
 */
static void
COMPATNAME(route_intr)(void *cookie)
{
        struct sockproto proto = { .sp_family = PF_XROUTE, };
        struct route_info * const ri = &COMPATNAME(route_info);
        struct mbuf *m;

        SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE();
        for (;;) {
                IFQ_LOCK(&ri->ri_intrq);
                IF_DEQUEUE(&ri->ri_intrq, m);
                IFQ_UNLOCK(&ri->ri_intrq);
                if (m == NULL)
                        break;
                proto.sp_protocol = M_GETCTX(m, uintptr_t);
#ifdef NET_MPSAFE
                mutex_enter(rt_so_mtx);
#endif
                raw_input(m, &proto, &ri->ri_src, &ri->ri_dst, &rt_rawcb);
#ifdef NET_MPSAFE
                mutex_exit(rt_so_mtx);
#endif
        }
        SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
}

/*
 * Enqueue a message to the software interrupt routine.
 */
void
COMPATNAME(route_enqueue)(struct mbuf *m, int family)
{
        struct route_info * const ri = &COMPATNAME(route_info);
        int wasempty;

        IFQ_LOCK(&ri->ri_intrq);
        if (IF_QFULL(&ri->ri_intrq)) {
                printf("%s: queue full, dropped message\n", __func__);
                IF_DROP(&ri->ri_intrq);
                IFQ_UNLOCK(&ri->ri_intrq);
                m_freem(m);
        } else {
                wasempty = IF_IS_EMPTY(&ri->ri_intrq);
                M_SETCTX(m, (uintptr_t)family);
                IF_ENQUEUE(&ri->ri_intrq, m);
                IFQ_UNLOCK(&ri->ri_intrq);
                if (wasempty) {
                        kpreempt_disable();
                        softint_schedule(ri->ri_sih);
                        kpreempt_enable();
                }
        }
}

static void
COMPATNAME(route_init)(void)
{
        struct route_info * const ri = &COMPATNAME(route_info);

#ifndef COMPAT_RTSOCK
        rt_init();
#ifdef NET_MPSAFE
        rt_so_mtx = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE);

        cv_init(&rt_update_cv, "rtsock_cv");
#endif

        sysctl_net_route_setup(NULL, PF_ROUTE, "rtable");
#endif
        ri->ri_intrq.ifq_maxlen = ri->ri_maxqlen;
        ri->ri_sih = softint_establish(SOFTINT_NET | SOFTINT_MPSAFE,
            COMPATNAME(route_intr), NULL);
        IFQ_LOCK_INIT(&ri->ri_intrq);

#ifdef MBUFTRACE
        MOWNER_ATTACH(&COMPATNAME(routedomain).dom_mowner);
#endif
}

/*
 * Definitions of protocols supported in the ROUTE domain.
 */
#ifndef COMPAT_RTSOCK
PR_WRAP_USRREQS(route);
#else
PR_WRAP_USRREQS(compat_50_route);
#endif

static const struct pr_usrreqs route_usrreqs = {
        .pr_attach      = COMPATNAME(route_attach_wrapper),
        .pr_detach      = COMPATNAME(route_detach_wrapper),
        .pr_accept      = COMPATNAME(route_accept_wrapper),
        .pr_bind        = COMPATNAME(route_bind_wrapper),
        .pr_listen      = COMPATNAME(route_listen_wrapper),
        .pr_connect     = COMPATNAME(route_connect_wrapper),
        .pr_connect2    = COMPATNAME(route_connect2_wrapper),
        .pr_disconnect  = COMPATNAME(route_disconnect_wrapper),
        .pr_shutdown    = COMPATNAME(route_shutdown_wrapper),
        .pr_abort       = COMPATNAME(route_abort_wrapper),
        .pr_ioctl       = COMPATNAME(route_ioctl_wrapper),
        .pr_stat        = COMPATNAME(route_stat_wrapper),
        .pr_peeraddr    = COMPATNAME(route_peeraddr_wrapper),
        .pr_sockaddr    = COMPATNAME(route_sockaddr_wrapper),
        .pr_rcvd        = COMPATNAME(route_rcvd_wrapper),
        .pr_recvoob     = COMPATNAME(route_recvoob_wrapper),
        .pr_send        = COMPATNAME(route_send_wrapper),
        .pr_sendoob     = COMPATNAME(route_sendoob_wrapper),
        .pr_purgeif     = COMPATNAME(route_purgeif_wrapper),
};

static const struct protosw COMPATNAME(route_protosw)[] = {
        {
                .pr_type = SOCK_RAW,
                .pr_domain = &COMPATNAME(routedomain),
                .pr_flags = PR_ATOMIC|PR_ADDR,
                .pr_ctlinput = raw_ctlinput,
                .pr_ctloutput = route_ctloutput,
                .pr_usrreqs = &route_usrreqs,
                .pr_init = rt_pr_init,
        },
};

struct domain COMPATNAME(routedomain) = {
        .dom_family = PF_XROUTE,
        .dom_name = DOMAINNAME,
        .dom_init = COMPATNAME(route_init),
        .dom_protosw = COMPATNAME(route_protosw),
        .dom_protoswNPROTOSW =
            &COMPATNAME(route_protosw)[__arraycount(COMPATNAME(route_protosw))],
#ifdef MBUFTRACE
        .dom_mowner = MOWNER_INIT("route", "rtm"),
#endif
};