No empty .Rs/.Re

[netbsd-mini2440.git] / sys / netinet / in_pcb.c

/*      $NetBSD: in_pcb.c,v 1.136 2009/05/09 20:54:52 elad 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) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Public Access Networks Corporation ("Panix").  It was developed under
 * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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) 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. 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
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: in_pcb.c,v 1.136 2009/05/09 20:54:52 elad Exp $");

#include "opt_inet.h"
#include "opt_ipsec.h"

#include <sys/param.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/once.h>
#include <sys/pool.h>
#include <sys/proc.h>
#include <sys/kauth.h>
#include <sys/uidinfo.h>
#include <sys/domain.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>

#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_pcb.h>
#endif

#ifdef IPSEC
#include <netinet6/ipsec.h>
#include <netkey/key.h>
#elif FAST_IPSEC
#include <netipsec/ipsec.h>
#include <netipsec/key.h>
#endif /* IPSEC */

struct  in_addr zeroin_addr;

#define INPCBHASH_PORT(table, lport) \
        &(table)->inpt_porthashtbl[ntohs(lport) & (table)->inpt_porthash]
#define INPCBHASH_BIND(table, laddr, lport) \
        &(table)->inpt_bindhashtbl[ \
            ((ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_bindhash]
#define INPCBHASH_CONNECT(table, faddr, fport, laddr, lport) \
        &(table)->inpt_connecthashtbl[ \
            ((ntohl((faddr).s_addr) + ntohs(fport)) + \
             (ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_connecthash]

int     anonportmin = IPPORT_ANONMIN;
int     anonportmax = IPPORT_ANONMAX;
int     lowportmin  = IPPORT_RESERVEDMIN;
int     lowportmax  = IPPORT_RESERVEDMAX;

static struct pool inpcb_pool;

static int
inpcb_poolinit(void)
{

        pool_init(&inpcb_pool, sizeof(struct inpcb), 0, 0, 0, "inpcbpl", NULL,
            IPL_NET);
        return 0;
}

void
in_pcbinit(struct inpcbtable *table, int bindhashsize, int connecthashsize)
{
        static ONCE_DECL(control);

        CIRCLEQ_INIT(&table->inpt_queue);
        table->inpt_porthashtbl = hashinit(bindhashsize, HASH_LIST, true,
            &table->inpt_porthash);
        table->inpt_bindhashtbl = hashinit(bindhashsize, HASH_LIST, true,
            &table->inpt_bindhash);
        table->inpt_connecthashtbl = hashinit(connecthashsize, HASH_LIST, true,
            &table->inpt_connecthash);
        table->inpt_lastlow = IPPORT_RESERVEDMAX;
        table->inpt_lastport = (u_int16_t)anonportmax;

        RUN_ONCE(&control, inpcb_poolinit);
}

int
in_pcballoc(struct socket *so, void *v)
{
        struct inpcbtable *table = v;
        struct inpcb *inp;
        int s;
#if defined(IPSEC) || defined(FAST_IPSEC)
        int error;
#endif

        s = splnet();
        inp = pool_get(&inpcb_pool, PR_NOWAIT);
        splx(s);
        if (inp == NULL)
                return (ENOBUFS);
        memset((void *)inp, 0, sizeof(*inp));
        inp->inp_af = AF_INET;
        inp->inp_table = table;
        inp->inp_socket = so;
        inp->inp_errormtu = -1;
#if defined(IPSEC) || defined(FAST_IPSEC)
        error = ipsec_init_pcbpolicy(so, &inp->inp_sp);
        if (error != 0) {
                s = splnet();
                pool_put(&inpcb_pool, inp);
                splx(s);
                return error;
        }
#endif
        so->so_pcb = inp;
        s = splnet();
        CIRCLEQ_INSERT_HEAD(&table->inpt_queue, &inp->inp_head,
            inph_queue);
        LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), &inp->inp_head,
            inph_lhash);
        in_pcbstate(inp, INP_ATTACHED);
        splx(s);
        return (0);
}

static int
in_pcbsetport(struct sockaddr_in *sin, struct inpcb *inp, kauth_cred_t cred)
{
        struct inpcbtable *table = inp->inp_table;
        struct socket *so = inp->inp_socket;
        int        cnt;
        u_int16_t  mymin, mymax;
        u_int16_t *lastport;
        u_int16_t lport = 0;
        enum kauth_network_req req;
        int error;

        if (inp->inp_flags & INP_LOWPORT) {
#ifndef IPNOPRIVPORTS
                req = KAUTH_REQ_NETWORK_BIND_PRIVPORT;
#else
                req = KAUTH_REQ_NETWORK_BIND_PORT;
#endif

                mymin = lowportmin;
                mymax = lowportmax;
                lastport = &table->inpt_lastlow;
        } else {
                req = KAUTH_REQ_NETWORK_BIND_PORT;

                mymin = anonportmin;
                mymax = anonportmax;
                lastport = &table->inpt_lastport;
        }

        /* XXX-kauth: KAUTH_REQ_NETWORK_BIND_AUTOASSIGN_{,PRIV}PORT */
        error = kauth_authorize_network(cred, KAUTH_NETWORK_BIND, req, so, sin,
            NULL);
        if (error)
                return (EACCES);

        if (mymin > mymax) {    /* sanity check */
                u_int16_t swp;

                swp = mymin;
                mymin = mymax;
                mymax = swp;
        }

        lport = *lastport - 1;
        for (cnt = mymax - mymin + 1; cnt; cnt--, lport--) {
                if (lport < mymin || lport > mymax)
                        lport = mymax;
                if (!in_pcblookup_port(table, sin->sin_addr, htons(lport), 1)) {
                        /* We have a free port, check with the secmodel(s). */
                        sin->sin_port = lport;
                        error = kauth_authorize_network(cred,
                            KAUTH_NETWORK_BIND, req, so, sin, NULL);
                        if (error) {
                                /* Secmodel says no. Keep looking. */
                                continue;
                        }

                        goto found;
                }
        }

        return (EAGAIN);

 found:
        inp->inp_flags |= INP_ANONPORT;
        *lastport = lport;
        lport = htons(lport);
        inp->inp_lport = lport;
        in_pcbstate(inp, INP_BOUND);

        return (0);
}

static int
in_pcbbind_addr(struct inpcb *inp, struct sockaddr_in *sin, kauth_cred_t cred)
{
        if (sin->sin_family != AF_INET)
                return (EAFNOSUPPORT);

        if (IN_MULTICAST(sin->sin_addr.s_addr)) {
                /* Always succeed; port reuse handled in in_pcbbind_port(). */
        } else if (!in_nullhost(sin->sin_addr)) {
                struct in_ifaddr *ia = NULL;

                INADDR_TO_IA(sin->sin_addr, ia);
                /* check for broadcast addresses */
                if (ia == NULL)
                        ia = ifatoia(ifa_ifwithaddr(sintosa(sin)));
                if (ia == NULL)
                        return (EADDRNOTAVAIL);
        }

        inp->inp_laddr = sin->sin_addr;

        return (0);
}

static int
in_pcbbind_port(struct inpcb *inp, struct sockaddr_in *sin, kauth_cred_t cred)
{
        struct inpcbtable *table = inp->inp_table;
        struct socket *so = inp->inp_socket;
        int reuseport = (so->so_options & SO_REUSEPORT);
        int wild = 0, error;

        if (IN_MULTICAST(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;
        } 

        if (sin->sin_port == 0) {
                error = in_pcbsetport(sin, inp, cred);
                if (error)
                        return (error);
        } else {
                struct inpcb *t;
#ifdef INET6
                struct in6pcb *t6;
                struct in6_addr mapped;
#endif
                enum kauth_network_req req;

                if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
                        wild = 1;

#ifndef IPNOPRIVPORTS
                if (ntohs(sin->sin_port) < IPPORT_RESERVED)
                        req = KAUTH_REQ_NETWORK_BIND_PRIVPORT;
                else
#endif /* !IPNOPRIVPORTS */
                        req = KAUTH_REQ_NETWORK_BIND_PORT;

                error = kauth_authorize_network(cred, KAUTH_NETWORK_BIND, req,
                    so, sin, NULL);
                if (error)
                        return (EACCES);

#ifdef INET6
                memset(&mapped, 0, sizeof(mapped));
                mapped.s6_addr16[5] = 0xffff;
                memcpy(&mapped.s6_addr32[3], &sin->sin_addr,
                    sizeof(mapped.s6_addr32[3]));
                t6 = in6_pcblookup_port(table, &mapped, sin->sin_port, wild);
                if (t6 && (reuseport & t6->in6p_socket->so_options) == 0)
                        return (EADDRINUSE);
#endif

                /* XXX-kauth */
                if (so->so_uidinfo->ui_uid && !IN_MULTICAST(sin->sin_addr.s_addr)) {
                        t = in_pcblookup_port(table, sin->sin_addr, sin->sin_port, 1);
                        /*
                         * XXX: investigate ramifications of loosening this
                         *      restriction so that as long as both ports have
                         *      SO_REUSEPORT allow the bind
                         */
                        if (t &&
                            (!in_nullhost(sin->sin_addr) ||
                             !in_nullhost(t->inp_laddr) ||
                             (t->inp_socket->so_options & SO_REUSEPORT) == 0)
                            && (so->so_uidinfo->ui_uid != t->inp_socket->so_uidinfo->ui_uid)) {
                                return (EADDRINUSE);
                        }
                }
                t = in_pcblookup_port(table, sin->sin_addr, sin->sin_port, wild);
                if (t && (reuseport & t->inp_socket->so_options) == 0)
                        return (EADDRINUSE);

                inp->inp_lport = sin->sin_port;
                in_pcbstate(inp, INP_BOUND);
        }

        LIST_REMOVE(&inp->inp_head, inph_lhash);
        LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), &inp->inp_head,
            inph_lhash);

        return (0);
}

int
in_pcbbind(void *v, struct mbuf *nam, struct lwp *l)
{
        struct inpcb *inp = v;
        struct sockaddr_in *sin = NULL; /* XXXGCC */
        struct sockaddr_in lsin;
        int error;

        if (inp->inp_af != AF_INET)
                return (EINVAL);

        if (TAILQ_FIRST(&in_ifaddrhead) == 0)
                return (EADDRNOTAVAIL);
        if (inp->inp_lport || !in_nullhost(inp->inp_laddr))
                return (EINVAL);

        if (nam != NULL) {
                sin = mtod(nam, struct sockaddr_in *);
                if (nam->m_len != sizeof (*sin))
                        return (EINVAL);
        } else {
                lsin = *((const struct sockaddr_in *)
                    inp->inp_socket->so_proto->pr_domain->dom_sa_any);
                sin = &lsin;
        }

        /* Bind address. */
        error = in_pcbbind_addr(inp, sin, l->l_cred);
        if (error)
                return (error);

        /* Bind port. */
        error = in_pcbbind_port(inp, sin, l->l_cred);
        if (error) {
                inp->inp_laddr.s_addr = INADDR_ANY;

                return (error);
        }

        return (0);
}

/*
 * 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(void *v, struct mbuf *nam, struct lwp *l)
{
        struct inpcb *inp = v;
        struct in_ifaddr *ia = NULL;
        struct sockaddr_in *ifaddr = NULL;
        struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *);
        int error;

        if (inp->inp_af != AF_INET)
                return (EINVAL);

        if (nam->m_len != sizeof (*sin))
                return (EINVAL);
        if (sin->sin_family != AF_INET)
                return (EAFNOSUPPORT);
        if (sin->sin_port == 0)
                return (EADDRNOTAVAIL);
        if (TAILQ_FIRST(&in_ifaddrhead) != 0) {
                /*
                 * If the destination address is INADDR_ANY,
                 * use any local address (likely loopback).
                 * If the supplied address is INADDR_BROADCAST,
                 * use the broadcast address of an interface
                 * which supports broadcast. (loopback does not)
                 */

                if (in_nullhost(sin->sin_addr)) {
                        sin->sin_addr =
                            TAILQ_FIRST(&in_ifaddrhead)->ia_addr.sin_addr;
                } else if (sin->sin_addr.s_addr == INADDR_BROADCAST) {
                        TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) {
                                if (ia->ia_ifp->if_flags & IFF_BROADCAST) {
                                        sin->sin_addr =
                                            ia->ia_broadaddr.sin_addr;
                                        break;
                                }
                        }
                }
        }
        /*
         * If we haven't bound which network number to use as ours,
         * we will use the number of the outgoing interface.
         * This depends on having done a routing lookup, which
         * we will probably have to do anyway, so we might
         * as well do it now.  On the other hand if we are
         * sending to multiple destinations we may have already
         * done the lookup, so see if we can use the route
         * from before.  In any case, we only
         * chose a port number once, even if sending to multiple
         * destinations.
         */
        if (in_nullhost(inp->inp_laddr)) {
                int xerror;
                ifaddr = in_selectsrc(sin, &inp->inp_route,
                    inp->inp_socket->so_options, inp->inp_moptions, &xerror);
                if (ifaddr == NULL) {
                        if (xerror == 0)
                                xerror = EADDRNOTAVAIL;
                        return xerror;
                }
                INADDR_TO_IA(ifaddr->sin_addr, ia);
                if (ia == NULL)
                        return (EADDRNOTAVAIL);
        }
        if (in_pcblookup_connect(inp->inp_table, sin->sin_addr, sin->sin_port,
            !in_nullhost(inp->inp_laddr) ? inp->inp_laddr : ifaddr->sin_addr,
            inp->inp_lport) != 0)
                return (EADDRINUSE);
        if (in_nullhost(inp->inp_laddr)) {
                if (inp->inp_lport == 0) {
                        error = in_pcbbind(inp, NULL, l);
                        /*
                         * This used to ignore the return value
                         * completely, but we need to check for
                         * ephemeral port shortage.
                         * And attempts to request low ports if not root.
                         */
                        if (error != 0)
                                return (error);
                }
                inp->inp_laddr = ifaddr->sin_addr;
        }
        inp->inp_faddr = sin->sin_addr;
        inp->inp_fport = sin->sin_port;
        in_pcbstate(inp, INP_CONNECTED);
#if defined(IPSEC) || defined(FAST_IPSEC)
        if (inp->inp_socket->so_type == SOCK_STREAM)
                ipsec_pcbconn(inp->inp_sp);
#endif
        return (0);
}

void
in_pcbdisconnect(void *v)
{
        struct inpcb *inp = v;

        if (inp->inp_af != AF_INET)
                return;

        inp->inp_faddr = zeroin_addr;
        inp->inp_fport = 0;
        in_pcbstate(inp, INP_BOUND);
#if defined(IPSEC) || defined(FAST_IPSEC)
        ipsec_pcbdisconn(inp->inp_sp);
#endif
        if (inp->inp_socket->so_state & SS_NOFDREF)
                in_pcbdetach(inp);
}

void
in_pcbdetach(void *v)
{
        struct inpcb *inp = v;
        struct socket *so = inp->inp_socket;
        int s;

        if (inp->inp_af != AF_INET)
                return;

#if defined(IPSEC) || defined(FAST_IPSEC)
        ipsec4_delete_pcbpolicy(inp);
#endif /*IPSEC*/
        so->so_pcb = 0;
        if (inp->inp_options)
                (void)m_free(inp->inp_options);
        rtcache_free(&inp->inp_route);
        ip_freemoptions(inp->inp_moptions);
        s = splnet();
        in_pcbstate(inp, INP_ATTACHED);
        LIST_REMOVE(&inp->inp_head, inph_lhash);
        CIRCLEQ_REMOVE(&inp->inp_table->inpt_queue, &inp->inp_head,
            inph_queue);
        pool_put(&inpcb_pool, inp);
        splx(s);
        sofree(so);                     /* drops the socket's lock */
        mutex_enter(softnet_lock);      /* reacquire the softnet_lock */
}

void
in_setsockaddr(struct inpcb *inp, struct mbuf *nam)
{
        struct sockaddr_in *sin;

        if (inp->inp_af != AF_INET)
                return;

        sin = mtod(nam, struct sockaddr_in *);
        sockaddr_in_init(sin, &inp->inp_laddr, inp->inp_lport);
        nam->m_len = sin->sin_len;
}

void
in_setpeeraddr(struct inpcb *inp, struct mbuf *nam)
{
        struct sockaddr_in *sin;

        if (inp->inp_af != AF_INET)
                return;

        sin = mtod(nam, struct sockaddr_in *);
        sockaddr_in_init(sin, &inp->inp_faddr, inp->inp_fport);
        nam->m_len = sin->sin_len;
}

/*
 * 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 splsoftnet.
 */
int
in_pcbnotify(struct inpcbtable *table, struct in_addr faddr, u_int fport_arg,
    struct in_addr laddr, u_int lport_arg, int errno,
    void (*notify)(struct inpcb *, int))
{
        struct inpcbhead *head;
        struct inpcb *inp, *ninp;
        u_int16_t fport = fport_arg, lport = lport_arg;
        int nmatch;

        if (in_nullhost(faddr) || notify == 0)
                return (0);

        nmatch = 0;
        head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport);
        for (inp = (struct inpcb *)LIST_FIRST(head); inp != NULL; inp = ninp) {
                ninp = (struct inpcb *)LIST_NEXT(inp, inp_hash);
                if (inp->inp_af != AF_INET)
                        continue;
                if (in_hosteq(inp->inp_faddr, faddr) &&
                    inp->inp_fport == fport &&
                    inp->inp_lport == lport &&
                    in_hosteq(inp->inp_laddr, laddr)) {
                        (*notify)(inp, errno);
                        nmatch++;
                }
        }
        return (nmatch);
}

void
in_pcbnotifyall(struct inpcbtable *table, struct in_addr faddr, int errno,
    void (*notify)(struct inpcb *, int))
{
        struct inpcb *inp, *ninp;

        if (in_nullhost(faddr) || notify == 0)
                return;

        for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue);
            inp != (void *)&table->inpt_queue;
            inp = ninp) {
                ninp = (struct inpcb *)CIRCLEQ_NEXT(inp, inp_queue);
                if (inp->inp_af != AF_INET)
                        continue;
                if (in_hosteq(inp->inp_faddr, faddr))
                        (*notify)(inp, errno);
        }
}

void
in_pcbpurgeif0(struct inpcbtable *table, struct ifnet *ifp)
{
        struct inpcb *inp, *ninp;
        struct ip_moptions *imo;
        int i, gap;

        for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue);
            inp != (void *)&table->inpt_queue;
            inp = ninp) {
                ninp = (struct inpcb *)CIRCLEQ_NEXT(inp, inp_queue);
                if (inp->inp_af != AF_INET)
                        continue;
                imo = inp->inp_moptions;
                if (imo != NULL) {
                        /*
                         * Unselect the outgoing interface if it is being
                         * detached.
                         */
                        if (imo->imo_multicast_ifp == ifp)
                                imo->imo_multicast_ifp = NULL;

                        /*
                         * Drop multicast group membership if we joined
                         * through the interface being detached.
                         */
                        for (i = 0, gap = 0; i < imo->imo_num_memberships;
                            i++) {
                                if (imo->imo_membership[i]->inm_ifp == ifp) {
                                        in_delmulti(imo->imo_membership[i]);
                                        gap++;
                                } else if (gap != 0)
                                        imo->imo_membership[i - gap] =
                                            imo->imo_membership[i];
                        }
                        imo->imo_num_memberships -= gap;
                }
        }
}

void
in_pcbpurgeif(struct inpcbtable *table, struct ifnet *ifp)
{
        struct rtentry *rt;
        struct inpcb *inp, *ninp;

        for (inp = (struct inpcb *)CIRCLEQ_FIRST(&table->inpt_queue);
            inp != (void *)&table->inpt_queue;
            inp = ninp) {
                ninp = (struct inpcb *)CIRCLEQ_NEXT(inp, inp_queue);
                if (inp->inp_af != AF_INET)
                        continue;
                if ((rt = rtcache_validate(&inp->inp_route)) != NULL &&
                    rt->rt_ifp == ifp)
                        in_rtchange(inp, 0);
        }
}

/*
 * 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(struct inpcb *inp)
{
        struct rtentry *rt;
        struct rt_addrinfo info;

        if (inp->inp_af != AF_INET)
                return;

        if ((rt = rtcache_validate(&inp->inp_route)) == NULL)
                return;

        memset(&info, 0, sizeof(info));
        info.rti_info[RTAX_DST] = rtcache_getdst(&inp->inp_route);
        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_getkey(rt),
                        rt->rt_gateway, rt_mask(rt), rt->rt_flags,
                        NULL);
        /*
         * A new route can be allocated
         * the next time output is attempted.
         */
        rtcache_free(&inp->inp_route);
}

/*
 * After a routing change, flush old routing.  A new route can be
 * allocated the next time output is attempted.
 */
void
in_rtchange(struct inpcb *inp, int errno)
{

        if (inp->inp_af != AF_INET)
                return;

        rtcache_free(&inp->inp_route);

        /* XXX SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */
}

struct inpcb *
in_pcblookup_port(struct inpcbtable *table, struct in_addr laddr,
    u_int lport_arg, int lookup_wildcard)
{
        struct inpcbhead *head;
        struct inpcb_hdr *inph;
        struct inpcb *inp, *match = 0;
        int matchwild = 3, wildcard;
        u_int16_t lport = lport_arg;

        head = INPCBHASH_PORT(table, lport);
        LIST_FOREACH(inph, head, inph_lhash) {
                inp = (struct inpcb *)inph;
                if (inp->inp_af != AF_INET)
                        continue;

                if (inp->inp_lport != lport)
                        continue;
                wildcard = 0;
                if (!in_nullhost(inp->inp_faddr))
                        wildcard++;
                if (in_nullhost(inp->inp_laddr)) {
                        if (!in_nullhost(laddr))
                                wildcard++;
                } else {
                        if (in_nullhost(laddr))
                                wildcard++;
                        else {
                                if (!in_hosteq(inp->inp_laddr, laddr))
                                        continue;
                        }
                }
                if (wildcard && !lookup_wildcard)
                        continue;
                if (wildcard < matchwild) {
                        match = inp;
                        matchwild = wildcard;
                        if (matchwild == 0)
                                break;
                }
        }
        return (match);
}

#ifdef DIAGNOSTIC
int     in_pcbnotifymiss = 0;
#endif

struct inpcb *
in_pcblookup_connect(struct inpcbtable *table,
    struct in_addr faddr, u_int fport_arg,
    struct in_addr laddr, u_int lport_arg)
{
        struct inpcbhead *head;
        struct inpcb_hdr *inph;
        struct inpcb *inp;
        u_int16_t fport = fport_arg, lport = lport_arg;

        head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport);
        LIST_FOREACH(inph, head, inph_hash) {
                inp = (struct inpcb *)inph;
                if (inp->inp_af != AF_INET)
                        continue;

                if (in_hosteq(inp->inp_faddr, faddr) &&
                    inp->inp_fport == fport &&
                    inp->inp_lport == lport &&
                    in_hosteq(inp->inp_laddr, laddr))
                        goto out;
        }
#ifdef DIAGNOSTIC
        if (in_pcbnotifymiss) {
                printf("in_pcblookup_connect: faddr=%08x fport=%d laddr=%08x lport=%d\n",
                    ntohl(faddr.s_addr), ntohs(fport),
                    ntohl(laddr.s_addr), ntohs(lport));
        }
#endif
        return (0);

out:
        /* Move this PCB to the head of hash chain. */
        inph = &inp->inp_head;
        if (inph != LIST_FIRST(head)) {
                LIST_REMOVE(inph, inph_hash);
                LIST_INSERT_HEAD(head, inph, inph_hash);
        }
        return (inp);
}

struct inpcb *
in_pcblookup_bind(struct inpcbtable *table,
    struct in_addr laddr, u_int lport_arg)
{
        struct inpcbhead *head;
        struct inpcb_hdr *inph;
        struct inpcb *inp;
        u_int16_t lport = lport_arg;

        head = INPCBHASH_BIND(table, laddr, lport);
        LIST_FOREACH(inph, head, inph_hash) {
                inp = (struct inpcb *)inph;
                if (inp->inp_af != AF_INET)
                        continue;

                if (inp->inp_lport == lport &&
                    in_hosteq(inp->inp_laddr, laddr))
                        goto out;
        }
        head = INPCBHASH_BIND(table, zeroin_addr, lport);
        LIST_FOREACH(inph, head, inph_hash) {
                inp = (struct inpcb *)inph;
                if (inp->inp_af != AF_INET)
                        continue;

                if (inp->inp_lport == lport &&
                    in_hosteq(inp->inp_laddr, zeroin_addr))
                        goto out;
        }
#ifdef DIAGNOSTIC
        if (in_pcbnotifymiss) {
                printf("in_pcblookup_bind: laddr=%08x lport=%d\n",
                    ntohl(laddr.s_addr), ntohs(lport));
        }
#endif
        return (0);

out:
        /* Move this PCB to the head of hash chain. */
        inph = &inp->inp_head;
        if (inph != LIST_FIRST(head)) {
                LIST_REMOVE(inph, inph_hash);
                LIST_INSERT_HEAD(head, inph, inph_hash);
        }
        return (inp);
}

void
in_pcbstate(struct inpcb *inp, int state)
{

        if (inp->inp_af != AF_INET)
                return;

        if (inp->inp_state > INP_ATTACHED)
                LIST_REMOVE(&inp->inp_head, inph_hash);

        switch (state) {
        case INP_BOUND:
                LIST_INSERT_HEAD(INPCBHASH_BIND(inp->inp_table,
                    inp->inp_laddr, inp->inp_lport), &inp->inp_head,
                    inph_hash);
                break;
        case INP_CONNECTED:
                LIST_INSERT_HEAD(INPCBHASH_CONNECT(inp->inp_table,
                    inp->inp_faddr, inp->inp_fport,
                    inp->inp_laddr, inp->inp_lport), &inp->inp_head,
                    inph_hash);
                break;
        }

        inp->inp_state = state;
}

struct rtentry *
in_pcbrtentry(struct inpcb *inp)
{
        struct route *ro;
        union {
                struct sockaddr         dst;
                struct sockaddr_in      dst4;
        } u;

        if (inp->inp_af != AF_INET)
                return (NULL);

        ro = &inp->inp_route;

        sockaddr_in_init(&u.dst4, &inp->inp_faddr, 0);
        return rtcache_lookup(ro, &u.dst);
}

struct sockaddr_in *
in_selectsrc(struct sockaddr_in *sin, struct route *ro,
    int soopts, struct ip_moptions *mopts, int *errorp)
{
        struct rtentry *rt = NULL;
        struct in_ifaddr *ia = NULL;

        /*
         * If route is known or can be allocated now, take the
         * source address from the interface.  Otherwise, punt.
         */
        if ((soopts & SO_DONTROUTE) != 0)
                rtcache_free(ro);
        else {
                union {
                        struct sockaddr         dst;
                        struct sockaddr_in      dst4;
                } u;

                sockaddr_in_init(&u.dst4, &sin->sin_addr, 0);
                rt = rtcache_lookup(ro, &u.dst);
        }
        /*
         * 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).
         *
         * XXX Is this still true?  Do we care?
         */
        if (rt != NULL && (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0)
                ia = ifatoia(rt->rt_ifa);
        if (ia == NULL) {
                u_int16_t fport = sin->sin_port;

                sin->sin_port = 0;
                ia = ifatoia(ifa_ifwithladdr(sintosa(sin)));
                sin->sin_port = fport;
                if (ia == NULL) {
                        /* Find 1st non-loopback AF_INET address */
                        TAILQ_FOREACH(ia, &in_ifaddrhead, ia_list) {
                                if (!(ia->ia_ifp->if_flags & IFF_LOOPBACK))
                                        break;
                        }
                }
                if (ia == NULL) {
                        *errorp = EADDRNOTAVAIL;
                        return NULL;
                }
        }
        /*
         * 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(sin->sin_addr.s_addr) && mopts != NULL) {
                struct ip_moptions *imo;
                struct ifnet *ifp;

                imo = mopts;
                if (imo->imo_multicast_ifp != NULL) {
                        ifp = imo->imo_multicast_ifp;
                        IFP_TO_IA(ifp, ia);             /* XXX */
                        if (ia == 0) {
                                *errorp = EADDRNOTAVAIL;
                                return NULL;
                        }
                }
        }
        if (ia->ia_ifa.ifa_getifa != NULL) {
                ia = ifatoia((*ia->ia_ifa.ifa_getifa)(&ia->ia_ifa,
                                                      sintosa(sin)));
        }
#ifdef GETIFA_DEBUG
        else
                printf("%s: missing ifa_getifa\n", __func__);
#endif
        return satosin(&ia->ia_addr);
}