source: rtems/cpukit/libnetworking/netinet/in_pcb.c @ 36799d4

/*
 * 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
 *      $Id$
 */

#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); }

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;
}

#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_gencnt = ++pcbinfo->ipi_gencnt;
        inp->inp_pcbinfo = pcbinfo;
        inp->inp_socket = so;
        s = splnet();
        LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list);
        pcbinfo->ipi_count++;
        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;
        struct inpcbinfo *ipi = inp->inp_pcbinfo;
        int s;

        inp->inp_gencnt = ++ipi->ipi_gencnt;
        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) {
                        match = inp;
                        matchwild = wildcard;
                        if (matchwild == 0) {
                                break;
                        }
                }
        }
        splx(s);
        return (match);
}

/*
 * Lookup PCB in hash list.
 */
struct inpcb *
in_pcblookuphash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard)
        struct inpcbinfo *pcbinfo;
        struct in_addr faddr, laddr;
        u_int fport_arg, lport_arg;
        int wildcard;
{
        struct inpcbhead *head;
        register struct inpcb *inp;
        u_short fport = fport_arg, lport = lport_arg;
        int s;

        s = splnet();
        /*
         * First look for an exact match.
         */
        head = &pcbinfo->hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, pcbinfo->hashmask)];
        for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) {
                if (inp->inp_faddr.s_addr == faddr.s_addr &&
                    inp->inp_laddr.s_addr == laddr.s_addr &&
                    inp->inp_fport == fport &&
                    inp->inp_lport == lport)
                        goto found;
        }
        if (wildcard) {
                struct inpcb *local_wild = NULL;

                head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
                for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) {
                        if (inp->inp_faddr.s_addr == INADDR_ANY &&
                            inp->inp_fport == 0 && inp->inp_lport == lport) {
                                if (inp->inp_laddr.s_addr == laddr.s_addr)
                                        goto found;
                                else if (inp->inp_laddr.s_addr == INADDR_ANY)
                                        local_wild = inp;
                        }
                }
                if (local_wild != NULL) {
                        inp = local_wild;
                        goto found;
                }
        }
        splx(s);
        return (NULL);

found:
        /*
         * Move PCB to head of this hash chain so that it can be
         * found more quickly in the future.
         * XXX - this is a pessimization on machines with few
         * concurrent connections.
         */
        if (inp != head->lh_first) {
                LIST_REMOVE(inp, inp_hash);
                LIST_INSERT_HEAD(head, inp, inp_hash);
        }
        splx(s);
        return (inp);
}

/*
 * Insert PCB into hash chain. Must be called at splnet.
 */
static void
in_pcbinshash(inp)
        struct inpcb *inp;
{
        struct inpcbhead *head;

        head = &inp->inp_pcbinfo->hashbase[INP_PCBHASH(inp->inp_faddr.s_addr,
                 inp->inp_lport, inp->inp_fport, inp->inp_pcbinfo->hashmask)];

        LIST_INSERT_HEAD(head, inp, inp_hash);
}

void
in_pcbrehash(inp)
        struct inpcb *inp;
{
        struct inpcbhead *head;
        int s;

        s = splnet();
        LIST_REMOVE(inp, inp_hash);

        head = &inp->inp_pcbinfo->hashbase[INP_PCBHASH(inp->inp_faddr.s_addr,
                inp->inp_lport, inp->inp_fport, inp->inp_pcbinfo->hashmask)];

        LIST_INSERT_HEAD(head, inp, inp_hash);
        inp->inp_pcbinfo->ipi_count--;
        splx(s);
}