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[netbsd-mini2440.git] / sys / net / rtsock.c

/*      $NetBSD: rtsock.c,v 1.126 2009/09/12 18:09:25 tsutsui 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.c,v 1.126 2009/09/12 18:09:25 tsutsui Exp $");

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

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mbuf.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/intr.h>
#ifdef RTSOCK_DEBUG
#include <netinet/in.h>
#endif /* RTSOCK_DEBUG */

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

#if defined(COMPAT_14) || defined(COMPAT_50)
#include <compat/net/if.h>
#endif

#include <machine/stdarg.h>

DOMAIN_DEFINE(routedomain);     /* forward declare and add to link set */

struct  sockaddr route_dst = { .sa_len = 2, .sa_family = PF_ROUTE, };
struct  sockaddr route_src = { .sa_len = 2, .sa_family = PF_ROUTE, };

int     route_maxqlen = IFQ_MAXLEN;
static struct   ifqueue route_intrq;
static void     *route_sih;

static int rt_msg2(int, struct rt_addrinfo *, void *, struct rt_walkarg *, int *);
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 void sysctl_net_route_setup(struct sysctllog **);
static int sysctl_dumpentry(struct rtentry *, void *);
static int sysctl_iflist(int, struct rt_walkarg *, int);
static int sysctl_rtable(SYSCTLFN_PROTO);
static void rt_adjustcount(int, int);

static void
rt_adjustcount(int af, int cnt)
{
        route_cb.any_count += cnt;
        switch (af) {
        case AF_INET:
                route_cb.ip_count += cnt;
                return;
#ifdef INET6
        case AF_INET6:
                route_cb.ip6_count += cnt;
                return;
#endif
        case AF_IPX:
                route_cb.ipx_count += cnt;
                return;
        case AF_NS:
                route_cb.ns_count += cnt;
                return;
        case AF_ISO:
                route_cb.iso_count += cnt;
                return;
        }
}

static void
cvtmetrics(struct rt_metrics *ortm, const struct nrt_metrics *rtm)
{
        ortm->rmx_locks = rtm->rmx_locks;
        ortm->rmx_mtu = rtm->rmx_mtu;
        ortm->rmx_hopcount = rtm->rmx_hopcount;
        ortm->rmx_expire = rtm->rmx_expire;
        ortm->rmx_recvpipe = rtm->rmx_recvpipe;
        ortm->rmx_sendpipe = rtm->rmx_sendpipe;
        ortm->rmx_ssthresh = rtm->rmx_ssthresh;
        ortm->rmx_rtt = rtm->rmx_rtt;
        ortm->rmx_rttvar = rtm->rmx_rttvar;
        ortm->rmx_pksent = rtm->rmx_pksent;
}

/*ARGSUSED*/
int
route_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
        struct mbuf *control, struct lwp *l)
{
        int error = 0;
        struct rawcb *rp = sotorawcb(so);
        int s;

        if (req == PRU_ATTACH) {
                sosetlock(so);
                rp = malloc(sizeof(*rp), M_PCB, M_WAITOK|M_ZERO);
                so->so_pcb = rp;
        }
        if (req == PRU_DETACH && rp)
                rt_adjustcount(rp->rcb_proto.sp_protocol, -1);
        s = splsoftnet();

        /*
         * Don't call raw_usrreq() in the attach case, because
         * we want to allow non-privileged processes to listen on
         * and send "safe" commands to the routing socket.
         */
        if (req == PRU_ATTACH) {
                if (l == NULL)
                        error = EACCES;
                else
                        error = raw_attach(so, (int)(long)nam);
        } else
                error = raw_usrreq(so, req, m, nam, control, l);

        rp = sotorawcb(so);
        if (req == PRU_ATTACH && rp) {
                if (error) {
                        free(rp, M_PCB);
                        splx(s);
                        return error;
                }
                rt_adjustcount(rp->rcb_proto.sp_protocol, 1);
                rp->rcb_laddr = &route_src;
                rp->rcb_faddr = &route_dst;
                soisconnected(so);
                so->so_options |= SO_USELOOPBACK;
        }
        splx(s);
        return error;
}

static const struct sockaddr *
intern_netmask(const struct sockaddr *mask)
{
        struct radix_node *rn;
        extern struct radix_node_head *mask_rnhead;

        if (mask != NULL &&
            (rn = rn_search(mask, mask_rnhead->rnh_treetop)))
                mask = (const struct sockaddr *)rn->rn_key;

        return mask;
}

/*ARGSUSED*/
int
route_output(struct mbuf *m, ...)
{
        struct sockproto proto = { .sp_family = PF_ROUTE, };
        struct rt_msghdr *rtm = NULL;
        struct rt_msghdr *old_rtm = NULL;
        struct rtentry *rt = NULL;
        struct rtentry *saved_nrt = NULL;
        struct rt_addrinfo info;
        int len, error = 0;
        struct ifnet *ifp = NULL;
        struct ifaddr *ifa = NULL;
        struct socket *so;
        va_list ap;
        sa_family_t family;

        va_start(ap, m);
        so = va_arg(ap, struct socket *);
        va_end(ap);

#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))
                return ENOBUFS;
        if ((m->m_flags & M_PKTHDR) == 0)
                panic("route_output");
        len = m->m_pkthdr.len;
        if (len < sizeof(*rtm) ||
            len != mtod(m, struct rt_msghdr *)->rtm_msglen) {
                info.rti_info[RTAX_DST] = NULL;
                senderr(EINVAL);
        }
        R_Malloc(rtm, struct rt_msghdr *, len);
        if (rtm == NULL) {
                info.rti_info[RTAX_DST] = NULL;
                senderr(ENOBUFS);
        }
        m_copydata(m, 0, len, rtm);
        if (rtm->rtm_version != RTM_VERSION) {
                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;
#ifdef RTSOCK_DEBUG
        if (info.rti_info[RTAX_DST]->sa_family == AF_INET) {
                printf("%s: extracted info.rti_info[RTAX_DST] %s\n", __func__,
                    inet_ntoa(((const struct sockaddr_in *)
                    info.rti_info[RTAX_DST])->sin_addr));
        }
#endif /* RTSOCK_DEBUG */
        if (info.rti_info[RTAX_DST] == NULL ||
            (info.rti_info[RTAX_DST]->sa_family >= AF_MAX))
                senderr(EINVAL);
        if (info.rti_info[RTAX_GATEWAY] != NULL &&
            (info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX))
                senderr(EINVAL);

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

        switch (rtm->rtm_type) {

        case RTM_ADD:
                if (info.rti_info[RTAX_GATEWAY] == NULL)
                        senderr(EINVAL);
                error = rtrequest1(rtm->rtm_type, &info, &saved_nrt);
                if (error == 0 && saved_nrt) {
                        rt_setmetrics(rtm->rtm_inits,
                            &rtm->rtm_rmx, &saved_nrt->rt_rmx);
                        saved_nrt->rt_refcnt--;
                }
                break;

        case RTM_DELETE:
                error = rtrequest1(rtm->rtm_type, &info, &saved_nrt);
                if (error == 0) {
                        (rt = saved_nrt)->rt_refcnt++;
                        goto report;
                }
                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
                 */
                error = rtrequest1(RTM_GET, &info, &rt);
                if (error != 0)
                        senderr(error);
                if (rtm->rtm_type != RTM_GET) {/* XXX: too grotty */
                        struct radix_node *rn;

                        if (memcmp(info.rti_info[RTAX_DST], rt_getkey(rt),
                            info.rti_info[RTAX_DST]->sa_len) != 0)
                                senderr(ESRCH);
                        info.rti_info[RTAX_NETMASK] = intern_netmask(
                            info.rti_info[RTAX_NETMASK]);
                        for (rn = rt->rt_nodes; rn; rn = rn->rn_dupedkey)
                                if (info.rti_info[RTAX_NETMASK] ==
                                    (const struct sockaddr *)rn->rn_mask)
                                        break;
                        if (rn == NULL)
                                senderr(ETOOMANYREFS);
                        rt = (struct rtentry *)rn;
                }

                switch (rtm->rtm_type) {
                case RTM_GET:
                report:
                        info.rti_info[RTAX_DST] = rt_getkey(rt);
                        info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
                        info.rti_info[RTAX_NETMASK] = rt_mask(rt);
                        if ((rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) == 0)
                                ;
                        else if ((ifp = rt->rt_ifp) != NULL) {
                                const struct ifaddr *rtifa;
                                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) {
                                        printf("%s: copying out RTAX_IFA %s ",
                                            __func__, inet_ntoa(
                                            ((const struct sockaddr_in *)
                                            info.rti_info[RTAX_IFA])->sin_addr)
                                            );
                                        printf("for info.rti_info[RTAX_DST] %s "
                                            "ifa_getifa %p ifa_seqno %p\n",
                                            inet_ntoa(
                                            ((const struct sockaddr_in *)
                                            info.rti_info[RTAX_DST])->sin_addr),
                                            (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;
                        } else {
                                info.rti_info[RTAX_IFP] = NULL;
                                info.rti_info[RTAX_IFA] = NULL;
                        }
                        (void)rt_msg2(rtm->rtm_type, &info, NULL, NULL, &len);
                        if (len > rtm->rtm_msglen) {
                                old_rtm = rtm;
                                R_Malloc(rtm, struct rt_msghdr *, len);
                                if (rtm == NULL)
                                        senderr(ENOBUFS);
                                (void)memcpy(rtm, old_rtm, old_rtm->rtm_msglen);
                        }
                        (void)rt_msg2(rtm->rtm_type, &info, rtm, NULL, 0);
                        rtm->rtm_flags = rt->rt_flags;
                        cvtmetrics(&rtm->rtm_rmx, &rt->rt_rmx);
                        rtm->rtm_addrs = info.rti_addrs;
                        break;

                case RTM_CHANGE:
                        /*
                         * 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 ((error = rt_getifa(&info)) != 0)
                                senderr(error);
                        if (info.rti_info[RTAX_GATEWAY] &&
                            rt_setgate(rt, info.rti_info[RTAX_GATEWAY]))
                                senderr(EDQUOT);
                        /* 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 (info.rti_info[RTAX_IFP] &&
                            (ifa = ifa_ifwithnet(info.rti_info[RTAX_IFP])) &&
                            (ifp = ifa->ifa_ifp) && (info.rti_info[RTAX_IFA] ||
                            info.rti_info[RTAX_GATEWAY])) {
                                ifa = ifaof_ifpforaddr(info.rti_info[RTAX_IFA] ?
                                    info.rti_info[RTAX_IFA] :
                                    info.rti_info[RTAX_GATEWAY], ifp);
                        } else if ((info.rti_info[RTAX_IFA] &&
                            (ifa = ifa_ifwithaddr(info.rti_info[RTAX_IFA]))) ||
                            (info.rti_info[RTAX_GATEWAY] &&
                            (ifa = ifa_ifwithroute(rt->rt_flags,
                            rt_getkey(rt), info.rti_info[RTAX_GATEWAY])))) {
                                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, &info);
                                        }
                                        rt_replace_ifa(rt, ifa);
                                        rt->rt_ifp = ifp;
                                }
                        }
                        rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx,
                            &rt->rt_rmx);
                        if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest)
                                rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info);
                        /*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)
                rtfree(rt);
    {
        struct rawcb *rp = NULL;
        /*
         * 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)
                                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, 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, &route_src, &route_dst);
        if (rp)
                rp->rcb_proto.sp_family = PF_ROUTE;
    }
        return error;
}

void
rt_setmetrics(u_long which, const struct rt_metrics *in, struct nrt_metrics *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);
        /* XXX time_t: Will not work after February 2145 (u_long time) */
        metric(RTV_EXPIRE, rmx_expire);
#undef metric
}

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_ADVANCE(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)))) & (~0 << i)) != 0)
                        return 1;
        } else if ((rtinfo->rti_addrs & (~0 << i)) != 0)
                return 1;
        /* Check for bad data length.  */
        if (cp != cplim) {
                if (i == RTAX_NETMASK + 1 && sa != NULL &&
                    cp - RT_ROUNDUP(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;
}

struct mbuf *
rt_msg1(int type, struct rt_addrinfo *rtinfo, void *data, int datalen)
{
        struct rt_msghdr *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, &routedomain.dom_mowner);
        switch (type) {

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

#ifdef COMPAT_14
        case RTM_OOIFINFO:
                len = sizeof(struct if_msghdr14);
                break;
#endif
#ifdef COMPAT_50
        case RTM_OIFINFO:
                len = sizeof(struct if_msghdr50);
                break;
#endif

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

        case RTM_IFANNOUNCE:
        case RTM_IEEE80211:
                len = sizeof(struct if_announcemsghdr);
                break;

        default:
                len = sizeof(struct rt_msghdr);
        }
        if (len > MHLEN + MLEN)
                panic("rt_msg1: message too long");
        else if (len > MHLEN) {
                m->m_next = m_get(M_DONTWAIT, MT_DATA);
                if (m->m_next == NULL) {
                        m_freem(m);
                        return NULL;
                }
                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->m_pkthdr.rcvif = NULL;
        m_copyback(m, 0, datalen, data);
        if (len > datalen)
                (void)memset(mtod(m, char *) + datalen, 0, len - datalen);
        rtm = mtod(m, struct rt_msghdr *);
        for (i = 0; i < RTAX_MAX; i++) {
                if ((sa = rtinfo->rti_info[i]) == NULL)
                        continue;
                rtinfo->rti_addrs |= (1 << i);
                dlen = RT_ROUNDUP(sa->sa_len);
                m_copyback(m, len, dlen, 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;
}

/*
 * 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:
        switch (type) {

        case RTM_DELADDR:
        case RTM_NEWADDR:
                len = sizeof(struct ifa_msghdr);
                break;
#ifdef COMPAT_14
        case RTM_OOIFINFO:
                len = sizeof(struct if_msghdr14);
                break;
#endif
#ifdef COMPAT_50
        case RTM_OIFINFO:
                len = sizeof(struct if_msghdr50);
                break;
#endif

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

        default:
                len = sizeof(struct rt_msghdr);
        }
        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_ROUNDUP(sa->sa_len);
                if (cp) {
                        (void)memcpy(cp, sa, (size_t)dlen);
                        cp += dlen;
                }
                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)
                                        free(rw->w_tmem, M_RTABLE);
                                rw->w_tmem = malloc(len, M_RTABLE, M_NOWAIT);
                                if (rw->w_tmem)
                                        rw->w_tmemsize = len;
                                else
                                        rw->w_tmemsize = 0;
                        }
                        if (rw->w_tmem) {
                                cp = rw->w_tmem;
                                second_time = 1;
                                goto again;
                        } else {
                                rw->w_tmemneeded = len;
                                return ENOBUFS;
                        }
                }
        }
        if (cp) {
                struct rt_msghdr *rtm = (struct rt_msghdr *)cp0;

                rtm->rtm_version = RTM_VERSION;
                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
rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error)
{
        struct rt_msghdr rtm;
        struct mbuf *m;
        const struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];

        if (route_cb.any_count == 0)
                return;
        memset(&rtm, 0, sizeof(rtm));
        rtm.rtm_flags = RTF_DONE | flags;
        rtm.rtm_errno = error;
        m = rt_msg1(type, rtinfo, &rtm, sizeof(rtm));
        if (m == NULL)
                return;
        mtod(m, struct rt_msghdr *)->rtm_addrs = rtinfo->rti_addrs;
        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
rt_ifmsg(struct ifnet *ifp)
{
        struct if_msghdr ifm;
        struct mbuf *m;
        struct rt_addrinfo info;

        if (route_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;
        ifm.ifm_data = ifp->if_data;
        ifm.ifm_addrs = 0;
        m = rt_msg1(RTM_IFINFO, &info, &ifm, sizeof(ifm));
        if (m == NULL)
                return;
        route_enqueue(m, 0);
#ifdef COMPAT_14
        compat_14_rt_ifmsg(ifp, &ifm);
#endif
#ifdef COMPAT_50
        compat_50_rt_ifmsg(ifp, &ifm);
#endif
}


/*
 * 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.
 */
void
rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt)
{
#define cmdpass(__cmd, __pass)  (((__cmd) << 2) | (__pass))
        struct rt_addrinfo info;
        const struct sockaddr *sa;
        int pass;
        struct mbuf *m;
        struct ifnet *ifp = ifa->ifa_ifp;
        struct rt_msghdr rtm;
        struct ifa_msghdr ifam;
        int ncmd;

        if (route_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):
                        if (cmd == RTM_ADD)
                                ncmd = RTM_NEWADDR;
                        else
                                ncmd = RTM_DELADDR;

                        info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
                        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;
                        memset(&ifam, 0, sizeof(ifam));
                        ifam.ifam_index = ifp->if_index;
                        ifam.ifam_metric = ifa->ifa_metric;
                        ifam.ifam_flags = ifa->ifa_flags;
                        m = rt_msg1(ncmd, &info, &ifam, sizeof(ifam));
                        if (m == NULL)
                                continue;
                        mtod(m, struct ifa_msghdr *)->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_index = ifp->if_index;
                        rtm.rtm_flags |= rt->rt_flags;
                        rtm.rtm_errno = error;
                        m = rt_msg1(cmd, &info, &rtm, sizeof(rtm));
                        if (m == NULL)
                                continue;
                        mtod(m, struct rt_msghdr *)->rtm_addrs = info.rti_addrs;
                        break;
                default:
                        continue;
                }
#ifdef DIAGNOSTIC
                if (m == NULL)
                        panic("%s: called with wrong command", __func__);
#endif
                route_enqueue(m, sa ? sa->sa_family : 0);
        }
#undef cmdpass
}

static struct mbuf *
rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
    struct rt_addrinfo *info)
{
        struct if_announcemsghdr 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 rt_msg1(type, info, &ifan, sizeof(ifan));
}

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

        if (route_cb.any_count == 0)
                return;
        m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info);
        if (m == NULL)
                return;
        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
rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len)
{
        struct mbuf *m;
        struct rt_addrinfo info;

        if (route_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_announcemsghdr *)->ifan_msglen += data_len;
        route_enqueue(m, 0);
}

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

        if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
                return 0;
        memset(&info, 0, sizeof(info));
        info.rti_info[RTAX_DST] = rt_getkey(rt);
        info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
        info.rti_info[RTAX_NETMASK] = rt_mask(rt);
        if (rt->rt_ifp) {
                const struct ifaddr *rtifa;
                info.rti_info[RTAX_IFP] = rt->rt_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;
                if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
                        info.rti_info[RTAX_BRD] = rtifa->ifa_dstaddr;
        }
        if ((error = rt_msg2(RTM_GET, &info, 0, w, &size)))
                return error;
        if (w->w_where && w->w_tmem && w->w_needed <= 0) {
                struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;

                rtm->rtm_flags = rt->rt_flags;
                rtm->rtm_use = rt->rt_use;
                cvtmetrics(&rtm->rtm_rmx, &rt->rt_rmx);
                KASSERT(rt->rt_ifp != NULL);
                rtm->rtm_index = rt->rt_ifp->if_index;
                rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0;
                rtm->rtm_addrs = info.rti_addrs;
                if ((error = copyout(rtm, w->w_where, size)) != 0)
                        w->w_where = NULL;
                else
                        w->w_where = (char *)w->w_where + size;
        }
        return error;
}

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

        memset(&info, 0, sizeof(info));
        IFNET_FOREACH(ifp) {
                if (w->w_arg && w->w_arg != ifp->if_index)
                        continue;
                if (IFADDR_EMPTY(ifp))
                        continue;
                info.rti_info[RTAX_IFP] = ifp->if_dl->ifa_addr;
                switch (type) {
                case NET_RT_IFLIST:
                        error = rt_msg2(RTM_IFINFO, &info, NULL, w, &len);
                        break;
#ifdef COMPAT_14
                case NET_RT_OOIFLIST:
                        error = rt_msg2(RTM_OOIFINFO, &info, NULL, w, &len);
                        break;
#endif
#ifdef COMPAT_50
                case NET_RT_OIFLIST:
                        error = rt_msg2(RTM_OIFINFO, &info, NULL, w, &len);
                        break;
#endif
                default:
                        panic("sysctl_iflist(1)");
                }
                if (error)
                        return error;
                info.rti_info[RTAX_IFP] = NULL;
                if (w->w_where && w->w_tmem && w->w_needed <= 0) {
                        switch (type) {
                        case NET_RT_IFLIST: {
                                struct if_msghdr *ifm;

                                ifm = (struct if_msghdr *)w->w_tmem;
                                ifm->ifm_index = ifp->if_index;
                                ifm->ifm_flags = ifp->if_flags;
                                ifm->ifm_data = ifp->if_data;
                                ifm->ifm_addrs = info.rti_addrs;
                                error = copyout(ifm, w->w_where, len);
                                if (error)
                                        return error;
                                w->w_where = (char *)w->w_where + len;
                                break;
                        }

#ifdef COMPAT_14
                        case NET_RT_OOIFLIST:
                                error = compat_14_iflist(ifp, w, &info, len);
                                if (error)
                                        return error;
                                break;
#endif
#ifdef COMPAT_50
                        case NET_RT_OIFLIST:
                                error = compat_50_iflist(ifp, w, &info, len);
                                if (error)
                                        return error;
                                break;
#endif
                        default:
                                panic("sysctl_iflist(2)");
                        }
                }
                IFADDR_FOREACH(ifa, ifp) {
                        if (af && af != ifa->ifa_addr->sa_family)
                                continue;
                        info.rti_info[RTAX_IFA] = ifa->ifa_addr;
                        info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
                        info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
                        if ((error = rt_msg2(RTM_NEWADDR, &info, 0, w, &len)))
                                return error;
                        if (w->w_where && w->w_tmem && w->w_needed <= 0) {
                                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 = copyout(w->w_tmem, w->w_where, len);
                                if (error)
                                        return error;
                                w->w_where = (char *)w->w_where + len;
                        }
                }
                info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] =
                    info.rti_info[RTAX_BRD] = NULL;
        }
        return 0;
}

static int
sysctl_rtable(SYSCTLFN_ARGS)
{
        void    *where = oldp;
        size_t  *given = oldlenp;
        const void *new = newp;
        int     i, s, error = EINVAL;
        u_char  af;
        struct  rt_walkarg w;

        if (namelen == 1 && name[0] == CTL_QUERY)
                return sysctl_query(SYSCTLFN_CALL(rnode));

        if (new)
                return EPERM;
        if (namelen != 3)
                return EINVAL;
        af = name[0];
        w.w_tmemneeded = 0;
        w.w_tmemsize = 0;
        w.w_tmem = NULL;
again:
        /* we may return here if a later [re]alloc of the t_mem buffer fails */
        if (w.w_tmemneeded) {
                w.w_tmem = malloc(w.w_tmemneeded, M_RTABLE, M_WAITOK);
                w.w_tmemsize = w.w_tmemneeded;
                w.w_tmemneeded = 0;
        }
        w.w_op = name[1];
        w.w_arg = name[2];
        w.w_given = *given;
        w.w_needed = 0 - w.w_given;
        w.w_where = where;

        s = splsoftnet();
        switch (w.w_op) {

        case NET_RT_DUMP:
        case NET_RT_FLAGS:
                for (i = 1; i <= AF_MAX; i++)
                        if ((af == 0 || af == i) &&
                            (error = rt_walktree(i, sysctl_dumpentry, &w)))
                                break;
                break;

#ifdef COMPAT_14
        case NET_RT_OOIFLIST:
                error = sysctl_iflist(af, &w, w.w_op);
                break;
#endif
#ifdef COMPAT_50
        case NET_RT_OIFLIST:
                error = sysctl_iflist(af, &w, w.w_op);
                break;
#endif

        case NET_RT_IFLIST:
                error = sysctl_iflist(af, &w, w.w_op);
        }
        splx(s);

        /* check to see if we couldn't allocate memory with NOWAIT */
        if (error == ENOBUFS && w.w_tmem == 0 && w.w_tmemneeded)
                goto again;

        if (w.w_tmem)
                free(w.w_tmem, M_RTABLE);
        w.w_needed += w.w_given;
        if (where) {
                *given = (char *)w.w_where - (char *)where;
                if (*given < w.w_needed)
                        return ENOMEM;
        } else {
                *given = (11 * w.w_needed) / 10;
        }
        return error;
}

/*
 * Routing message software interrupt routine
 */
static void
route_intr(void *cookie)
{
        struct sockproto proto = { .sp_family = PF_ROUTE, };
        struct mbuf *m;
        int s;

        mutex_enter(softnet_lock);
        KERNEL_LOCK(1, NULL);
        while (!IF_IS_EMPTY(&route_intrq)) {
                s = splnet();
                IF_DEQUEUE(&route_intrq, m);
                splx(s);
                if (m == NULL)
                        break;
                proto.sp_protocol = M_GETCTX(m, uintptr_t);
                raw_input(m, &proto, &route_src, &route_dst);
        }
        KERNEL_UNLOCK_ONE(NULL);
        mutex_exit(softnet_lock);
}

/*
 * Enqueue a message to the software interrupt routine.
 */
void
route_enqueue(struct mbuf *m, int family)
{
        int s, wasempty;

        s = splnet();
        if (IF_QFULL(&route_intrq)) {
                IF_DROP(&route_intrq);
                m_freem(m);
        } else {
                wasempty = IF_IS_EMPTY(&route_intrq);
                M_SETCTX(m, (uintptr_t)family);
                IF_ENQUEUE(&route_intrq, m);
                if (wasempty)
                        softint_schedule(route_sih);
        }
        splx(s);
}

void
rt_init(void)
{

        sysctl_net_route_setup(NULL);
        route_intrq.ifq_maxlen = route_maxqlen;
        route_sih = softint_establish(SOFTINT_NET | SOFTINT_MPSAFE,
            route_intr, NULL);
}

/*
 * Definitions of protocols supported in the ROUTE domain.
 */
PR_WRAP_USRREQ(route_usrreq)
#define route_usrreq    route_usrreq_wrapper

const struct protosw routesw[] = {
        {
                .pr_type = SOCK_RAW,
                .pr_domain = &routedomain,
                .pr_flags = PR_ATOMIC|PR_ADDR,
                .pr_input = raw_input,
                .pr_output = route_output,
                .pr_ctlinput = raw_ctlinput,
                .pr_usrreq = route_usrreq,
                .pr_init = raw_init,
        },
};

struct domain routedomain = {
        .dom_family = PF_ROUTE,
        .dom_name = "route",
        .dom_init = route_init,
        .dom_protosw = routesw,
        .dom_protoswNPROTOSW = &routesw[__arraycount(routesw)],
};

static void
sysctl_net_route_setup(struct sysctllog **clog)
{
        const struct sysctlnode *rnode = NULL;

        sysctl_createv(clog, 0, NULL, NULL,
                       CTLFLAG_PERMANENT,
                       CTLTYPE_NODE, "net", NULL,
                       NULL, 0, NULL, 0,
                       CTL_NET, CTL_EOL);

        sysctl_createv(clog, 0, NULL, &rnode,
                       CTLFLAG_PERMANENT,
                       CTLTYPE_NODE, "route",
                       SYSCTL_DESCR("PF_ROUTE information"),
                       NULL, 0, NULL, 0,
                       CTL_NET, PF_ROUTE, CTL_EOL);
        sysctl_createv(clog, 0, NULL, NULL,
                       CTLFLAG_PERMANENT,
                       CTLTYPE_NODE, "rtable",
                       SYSCTL_DESCR("Routing table information"),
                       sysctl_rtable, 0, NULL, 0,
                       CTL_NET, PF_ROUTE, 0 /* any protocol */, CTL_EOL);
        sysctl_createv(clog, 0, &rnode, NULL,
                       CTLFLAG_PERMANENT,
                       CTLTYPE_STRUCT, "stats",
                       SYSCTL_DESCR("Routing statistics"),
                       NULL, 0, &rtstat, sizeof(rtstat),
                       CTL_CREATE, CTL_EOL);
}