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/*

 * Copyright (c) 1982, 1986, 1991, 1993, 1995

 *      The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by the University of

 *      California, Berkeley and its contributors.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 *      @(#)in_pcb.c    8.4 (Berkeley) 5/24/95

 *      $Id: in_pcb.c,v 1.2 2001-09-27 12:01:55 chris Exp $

 */

#include <sys/param.h>

#include <sys/queue.h>

#include <sys/systm.h>

#include <sys/malloc.h>

#include <sys/mbuf.h>

#include <sys/protosw.h>

#include <sys/socket.h>

#include <sys/socketvar.h>

#include <sys/ioctl.h>

#include <sys/errno.h>

#include <sys/time.h>

#include <sys/proc.h>

#include <sys/kernel.h>

#include <sys/sysctl.h>

#include <net/if.h>

#include <net/route.h>

#include <netinet/in.h>

#include <netinet/in_systm.h>

#include <netinet/ip.h>

#include <netinet/in_pcb.h>

#include <netinet/in_var.h>

#include <netinet/ip_var.h>

struct  in_addr zeroin_addr;

static void      in_pcbinshash __P((struct inpcb *));

static void      in_rtchange __P((struct inpcb *, int));

/*

 * These configure the range of local port addresses assigned to

 * "unspecified" outgoing connections/packets/whatever.

 */

static int ipport_lowfirstauto  = IPPORT_RESERVED - 1;  /* 1023 */

static int ipport_lowlastauto = IPPORT_RESERVEDSTART;   /* 600 */

static int ipport_firstauto = IPPORT_RESERVED;          /* 1024 */

static int ipport_lastauto  = IPPORT_USERRESERVED;      /* 5000 */

static int ipport_hifirstauto = IPPORT_HIFIRSTAUTO;     /* 40000 */

static int ipport_hilastauto  = IPPORT_HILASTAUTO;      /* 44999 */

#define RANGECHK(var, min, max) \

        if ((var) < (min)) { (var) = (min); } \

        else if ((var) > (max)) { (var) = (max); }

#if 0

static int

sysctl_net_ipport_check SYSCTL_HANDLER_ARGS

{

        int error = sysctl_handle_int(oidp,

                oidp->oid_arg1, oidp->oid_arg2, req);

        if (!error) {

                RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);

                RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);

                RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX);

                RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX);

                RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX);

                RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX);

        }

        return error;

}

#endif

#undef RANGECHK

SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");

SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT|CTLFLAG_RW,

           &ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");

SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT|CTLFLAG_RW,

           &ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");

SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT|CTLFLAG_RW,

           &ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");

SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT|CTLFLAG_RW,

           &ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");

SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT|CTLFLAG_RW,

           &ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");

SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT|CTLFLAG_RW,

           &ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");

int

in_pcballoc(so, pcbinfo)

        struct socket *so;

        struct inpcbinfo *pcbinfo;

{

        register struct inpcb *inp;

        int s;

        MALLOC(inp, struct inpcb *, sizeof(*inp), M_PCB, M_NOWAIT);

        if (inp == NULL)

                return (ENOBUFS);

        bzero((caddr_t)inp, sizeof(*inp));

        inp->inp_pcbinfo = pcbinfo;

        inp->inp_socket = so;

        s = splnet();

        LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list);

        in_pcbinshash(inp);

        splx(s);

        so->so_pcb = (caddr_t)inp;

        return (0);

}

int

in_pcbbind(inp, nam)

        register struct inpcb *inp;

        struct mbuf *nam;

{

        register struct socket *so = inp->inp_socket;

        unsigned short *lastport;

        struct sockaddr_in *sin;

        u_short lport = 0;

        int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);

        int error;

        if (in_ifaddr == 0)

                return (EADDRNOTAVAIL);

        if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY)

                return (EINVAL);

        if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 &&

            ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||

             (so->so_options & SO_ACCEPTCONN) == 0))

                wild = 1;

        if (nam) {

                sin = mtod(nam, struct sockaddr_in *);

                if (nam->m_len != sizeof (*sin))

                        return (EINVAL);

#ifdef notdef

                /*

                 * We should check the family, but old programs

                 * incorrectly fail to initialize it.

                 */

                if (sin->sin_family != AF_INET)

                        return (EAFNOSUPPORT);

#endif

                lport = sin->sin_port;

                if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {

                        /*

                         * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;

                         * allow complete duplication of binding if

                         * SO_REUSEPORT is set, or if SO_REUSEADDR is set

                         * and a multicast address is bound on both

                         * new and duplicated sockets.

                         */

                        if (so->so_options & SO_REUSEADDR)

                                reuseport = SO_REUSEADDR|SO_REUSEPORT;

                } else if (sin->sin_addr.s_addr != INADDR_ANY) {

                        sin->sin_port = 0;               /* yech... */

                        if (ifa_ifwithaddr((struct sockaddr *)sin) == 0)

                                return (EADDRNOTAVAIL);

                }

                if (lport) {

                        struct inpcb *t;

                        /* GROSS */

                        if (ntohs(lport) < IPPORT_RESERVED &&

                            (error = suser(p->p_ucred, &p->p_acflag)))

                                return (EACCES);

                        if (so->so_uid) {

                                t = in_pcblookup(inp->inp_pcbinfo, zeroin_addr,

                                    0, sin->sin_addr, lport,

                                    INPLOOKUP_WILDCARD);

                                if (t && (so->so_uid != t->inp_socket->so_uid))

                                        return (EADDRINUSE);

                        }

                        t = in_pcblookup(inp->inp_pcbinfo, zeroin_addr, 0,

                            sin->sin_addr, lport, wild);

                        if (t && (reuseport & t->inp_socket->so_options) == 0)

                                return (EADDRINUSE);

                }

                inp->inp_laddr = sin->sin_addr;

        }

        if (lport == 0) {

                ushort first, last;

                int count;

                inp->inp_flags |= INP_ANONPORT;

                if (inp->inp_flags & INP_HIGHPORT) {

                        first = ipport_hifirstauto;     /* sysctl */

                        last  = ipport_hilastauto;

                        lastport = &inp->inp_pcbinfo->lasthi;

                } else if (inp->inp_flags & INP_LOWPORT) {

                        if ((error = suser(p->p_ucred, &p->p_acflag)))

                                return (EACCES);

                        first = ipport_lowfirstauto;    /* 1023 */

                        last  = ipport_lowlastauto;     /* 600 */

                        lastport = &inp->inp_pcbinfo->lastlow;

                } else {

                        first = ipport_firstauto;       /* sysctl */

                        last  = ipport_lastauto;

                        lastport = &inp->inp_pcbinfo->lastport;

                }

                /*

                 * Simple check to ensure all ports are not used up causing

                 * a deadlock here.

                 *

                 * We split the two cases (up and down) so that the direction

                 * is not being tested on each round of the loop.

                 */

                if (first > last) {

                        /*

                         * counting down

                         */

                        count = first - last;

                        do {

                                if (count-- <= 0)        /* completely used? */

                                        return (EADDRNOTAVAIL);

                                --*lastport;

                                if (*lastport > first || *lastport < last)

                                        *lastport = first;

                                lport = htons(*lastport);

                        } while (in_pcblookup(inp->inp_pcbinfo,

                                 zeroin_addr, 0, inp->inp_laddr, lport, wild));

                } else {

                        /*

                         * counting up

                         */

                        count = last - first;

                        do {

                                if (count-- <= 0)        /* completely used? */

                                        return (EADDRNOTAVAIL);

                                ++*lastport;

                                if (*lastport < first || *lastport > last)

                                        *lastport = first;

                                lport = htons(*lastport);

                        } while (in_pcblookup(inp->inp_pcbinfo,

                                 zeroin_addr, 0, inp->inp_laddr, lport, wild));

                }

        }

        inp->inp_lport = lport;

        in_pcbrehash(inp);

        return (0);

}

/*

 *   Transform old in_pcbconnect() into an inner subroutine for new

 *   in_pcbconnect(): Do some validity-checking on the remote

 *   address (in mbuf 'nam') and then determine local host address

 *   (i.e., which interface) to use to access that remote host.

 *

 *   This preserves definition of in_pcbconnect(), while supporting a

 *   slightly different version for T/TCP.  (This is more than

 *   a bit of a kludge, but cleaning up the internal interfaces would

 *   have forced minor changes in every protocol).

 */

int

in_pcbladdr(inp, nam, plocal_sin)

        register struct inpcb *inp;

        struct mbuf *nam;

        struct sockaddr_in **plocal_sin;

{

        struct in_ifaddr *ia;

        register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *);

        if (nam->m_len != sizeof (*sin))

                return (EINVAL);

        if (sin->sin_family != AF_INET)

                return (EAFNOSUPPORT);

        if (sin->sin_port == 0)

                return (EADDRNOTAVAIL);

        if (in_ifaddr) {

                /*

                 * If the destination address is INADDR_ANY,

                 * use the primary local address.

                 * If the supplied address is INADDR_BROADCAST,

                 * and the primary interface supports broadcast,

                 * choose the broadcast address for that interface.

                 */

#define satosin(sa)     ((struct sockaddr_in *)(sa))

#define sintosa(sin)    ((struct sockaddr *)(sin))

#define ifatoia(ifa)    ((struct in_ifaddr *)(ifa))

                if (sin->sin_addr.s_addr == INADDR_ANY)

                    sin->sin_addr = IA_SIN(in_ifaddr)->sin_addr;

                else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&

                  (in_ifaddr->ia_ifp->if_flags & IFF_BROADCAST))

                    sin->sin_addr = satosin(&in_ifaddr->ia_broadaddr)->sin_addr;

        }

        if (inp->inp_laddr.s_addr == INADDR_ANY) {

                register struct route *ro;

                ia = (struct in_ifaddr *)0;

                /*

                 * If route is known or can be allocated now,

                 * our src addr is taken from the i/f, else punt.

                 */

                ro = &inp->inp_route;

                if (ro->ro_rt &&

                    (satosin(&ro->ro_dst)->sin_addr.s_addr !=

                        sin->sin_addr.s_addr ||

                    inp->inp_socket->so_options & SO_DONTROUTE)) {

                        RTFREE(ro->ro_rt);

                        ro->ro_rt = (struct rtentry *)0;

                }

                if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/

                    (ro->ro_rt == (struct rtentry *)0 ||

                    ro->ro_rt->rt_ifp == (struct ifnet *)0)) {

                        /* No route yet, so try to acquire one */

                        ro->ro_dst.sa_family = AF_INET;

                        ro->ro_dst.sa_len = sizeof(struct sockaddr_in);

                        ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =

                                sin->sin_addr;

                        rtalloc(ro);

                }

                /*

                 * If we found a route, use the address

                 * corresponding to the outgoing interface

                 * unless it is the loopback (in case a route

                 * to our address on another net goes to loopback).

                 */

                if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK))

                        ia = ifatoia(ro->ro_rt->rt_ifa);

                if (ia == 0) {

                        u_short fport = sin->sin_port;

                        sin->sin_port = 0;

                        ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));

                        if (ia == 0)

                                ia = ifatoia(ifa_ifwithnet(sintosa(sin)));

                        sin->sin_port = fport;

                        if (ia == 0)

                                ia = in_ifaddr;

                        if (ia == 0)

                                return (EADDRNOTAVAIL);

                }

                /*

                 * If the destination address is multicast and an outgoing

                 * interface has been set as a multicast option, use the

                 * address of that interface as our source address.

                 */

                if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&

                    inp->inp_moptions != NULL) {

                        struct ip_moptions *imo;

                        struct ifnet *ifp;

                        imo = inp->inp_moptions;

                        if (imo->imo_multicast_ifp != NULL) {

                                ifp = imo->imo_multicast_ifp;

                                for (ia = in_ifaddr; ia; ia = ia->ia_next)

                                        if (ia->ia_ifp == ifp)

                                                break;

                                if (ia == 0)

                                        return (EADDRNOTAVAIL);

                        }

                }

        /*

         * Don't do pcblookup call here; return interface in plocal_sin

         * and exit to caller, that will do the lookup.

         */

                *plocal_sin = &ia->ia_addr;

        }

        return(0);

}

/*

 * Outer subroutine:

 * Connect from a socket to a specified address.

 * Both address and port must be specified in argument sin.

 * If don't have a local address for this socket yet,

 * then pick one.

 */

int

in_pcbconnect(inp, nam)

        register struct inpcb *inp;

        struct mbuf *nam;

{

        struct sockaddr_in *ifaddr;

        register struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *);

        int error;

        /*

         *   Call inner routine, to assign local interface address.

         */

        if ((error = in_pcbladdr(inp, nam, &ifaddr)))

                return(error);

        if (in_pcblookuphash(inp->inp_pcbinfo, sin->sin_addr, sin->sin_port,

            inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr,

            inp->inp_lport, 0) != NULL)

                return (EADDRINUSE);

        if (inp->inp_laddr.s_addr == INADDR_ANY) {

                if (inp->inp_lport == 0)

                        (void)in_pcbbind(inp, (struct mbuf *)0);

                inp->inp_laddr = ifaddr->sin_addr;

        }

        inp->inp_faddr = sin->sin_addr;

        inp->inp_fport = sin->sin_port;

        in_pcbrehash(inp);

        return (0);

}

void

in_pcbdisconnect(inp)

        struct inpcb *inp;

{

        inp->inp_faddr.s_addr = INADDR_ANY;

        inp->inp_fport = 0;

        in_pcbrehash(inp);

        if (inp->inp_socket->so_state & SS_NOFDREF)

                in_pcbdetach(inp);

}

void

in_pcbdetach(inp)

        struct inpcb *inp;

{

        struct socket *so = inp->inp_socket;

        int s;

        so->so_pcb = 0;

        sofree(so);

        if (inp->inp_options)

                (void)m_free(inp->inp_options);

        if (inp->inp_route.ro_rt)

                rtfree(inp->inp_route.ro_rt);

        ip_freemoptions(inp->inp_moptions);

        s = splnet();

        LIST_REMOVE(inp, inp_hash);

        LIST_REMOVE(inp, inp_list);

        splx(s);

        FREE(inp, M_PCB);

}

void

in_setsockaddr(inp, nam)

        register struct inpcb *inp;

        struct mbuf *nam;

{

        register struct sockaddr_in *sin;

        nam->m_len = sizeof (*sin);

        sin = mtod(nam, struct sockaddr_in *);

        bzero((caddr_t)sin, sizeof (*sin));

        sin->sin_family = AF_INET;

        sin->sin_len = sizeof(*sin);

        sin->sin_port = inp->inp_lport;

        sin->sin_addr = inp->inp_laddr;

}

void

in_setpeeraddr(inp, nam)

        struct inpcb *inp;

        struct mbuf *nam;

{

        register struct sockaddr_in *sin;

        nam->m_len = sizeof (*sin);

        sin = mtod(nam, struct sockaddr_in *);

        bzero((caddr_t)sin, sizeof (*sin));

        sin->sin_family = AF_INET;

        sin->sin_len = sizeof(*sin);

        sin->sin_port = inp->inp_fport;

        sin->sin_addr = inp->inp_faddr;

}

/*

 * Pass some notification to all connections of a protocol

 * associated with address dst.  The local address and/or port numbers

 * may be specified to limit the search.  The "usual action" will be

 * taken, depending on the ctlinput cmd.  The caller must filter any

 * cmds that are uninteresting (e.g., no error in the map).

 * Call the protocol specific routine (if any) to report

 * any errors for each matching socket.

 *

 * Must be called at splnet.

 */

void

in_pcbnotify(head, dst, fport_arg, laddr, lport_arg, cmd, notify)

        struct inpcbhead *head;

        struct sockaddr *dst;

        u_int fport_arg, lport_arg;

        struct in_addr laddr;

        int cmd;

        void (*notify) __P((struct inpcb *, int));

{

        register struct inpcb *inp, *oinp;

        struct in_addr faddr;

        u_short fport = fport_arg, lport = lport_arg;

        int errnum, s;

        if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET)

                return;

        faddr = ((struct sockaddr_in *)dst)->sin_addr;

        if (faddr.s_addr == INADDR_ANY)

                return;

        /*

         * Redirects go to all references to the destination,

         * and use in_rtchange to invalidate the route cache.

         * Dead host indications: notify all references to the destination.

         * Otherwise, if we have knowledge of the local port and address,

         * deliver only to that socket.

         */

        if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {

                fport = 0;

                lport = 0;

                laddr.s_addr = 0;

                if (cmd != PRC_HOSTDEAD)

                        notify = in_rtchange;

        }

        errnum = inetctlerrmap[cmd];

        s = splnet();

        for (inp = head->lh_first; inp != NULL;) {

                if (inp->inp_faddr.s_addr != faddr.s_addr ||

                    inp->inp_socket == 0 ||

                    (lport && inp->inp_lport != lport) ||

                    (laddr.s_addr && inp->inp_laddr.s_addr != laddr.s_addr) ||

                    (fport && inp->inp_fport != fport)) {

                        inp = inp->inp_list.le_next;

                        continue;

                }

                oinp = inp;

                inp = inp->inp_list.le_next;

                if (notify)

                        (*notify)(oinp, errnum);

        }

        splx(s);

}

/*

 * Check for alternatives when higher level complains

 * about service problems.  For now, invalidate cached

 * routing information.  If the route was created dynamically

 * (by a redirect), time to try a default gateway again.

 */

void

in_losing(inp)

        struct inpcb *inp;

{

        register struct rtentry *rt;

        struct rt_addrinfo info;

        if ((rt = inp->inp_route.ro_rt)) {

                inp->inp_route.ro_rt = 0;

                bzero((caddr_t)&info, sizeof(info));

                info.rti_info[RTAX_DST] =

                        (struct sockaddr *)&inp->inp_route.ro_dst;

                info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;

                info.rti_info[RTAX_NETMASK] = rt_mask(rt);

                rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);

                if (rt->rt_flags & RTF_DYNAMIC)

                        (void) rtrequest(RTM_DELETE, rt_key(rt),

                                rt->rt_gateway, rt_mask(rt), rt->rt_flags,

                                (struct rtentry **)0);

                else

                /*

                 * A new route can be allocated

                 * the next time output is attempted.

                 */

                        rtfree(rt);

        }

}

/*

 * After a routing change, flush old routing

 * and allocate a (hopefully) better one.

 */

static void

in_rtchange(inp, errnum)

        register struct inpcb *inp;

        int errnum;

{

        if (inp->inp_route.ro_rt) {

                rtfree(inp->inp_route.ro_rt);

                inp->inp_route.ro_rt = 0;

                /*

                 * A new route can be allocated the next time

                 * output is attempted.

                 */

        }

}

struct inpcb *

in_pcblookup(pcbinfo, faddr, fport_arg, laddr, lport_arg, wild_okay)

        struct inpcbinfo *pcbinfo;

        struct in_addr faddr, laddr;

        u_int fport_arg, lport_arg;

        int wild_okay;

{

        register struct inpcb *inp, *match = NULL;

        int matchwild = 3, wildcard;

        u_short fport = fport_arg, lport = lport_arg;

        int s;

        s = splnet();

        for (inp = pcbinfo->listhead->lh_first; inp != NULL; inp = inp->inp_list.le_next) {

                if (inp->inp_lport != lport)

                        continue;

                wildcard = 0;

                if (inp->inp_faddr.s_addr != INADDR_ANY) {

                        if (faddr.s_addr == INADDR_ANY)

                                wildcard++;

                        else if (inp->inp_faddr.s_addr != faddr.s_addr ||

                            inp->inp_fport != fport)

                                continue;

                } else {

                        if (faddr.s_addr != INADDR_ANY)

                                wildcard++;

                }

                if (inp->inp_laddr.s_addr != INADDR_ANY) {

                        if (laddr.s_addr == INADDR_ANY)

                                wildcard++;

                        else if (inp->inp_laddr.s_addr != laddr.s_addr)

                                continue;

                } else {

                        if (laddr.s_addr != INADDR_ANY)

                                wildcard++;

                }

                if (wildcard && wild_okay == 0)

                        continue;

                if (wildcard < matchwild) {