Make sure lo0 is brought up before any other interfaces to avoid problems

[dragonfly.git] / sys / netinet / in_pcb.c

/*
 * Copyright (c) 2004 Jeffrey M. Hsu.  All rights reserved.
 * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Jeffrey M. Hsu.
 *
 * 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 DragonFly 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 COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDERS 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. 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
 * $FreeBSD: src/sys/netinet/in_pcb.c,v 1.59.2.27 2004/01/02 04:06:42 ambrisko Exp $
 * $DragonFly: src/sys/netinet/in_pcb.c,v 1.44 2007/12/19 11:10:42 sephe Exp $
 */

#include "opt_ipsec.h"
#include "opt_inet6.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/proc.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/thread2.h>

#include <machine/limits.h>

#include <vm/vm_zone.h>

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

#include <netinet/in.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>
#endif /* INET6 */

#ifdef IPSEC
#include <netinet6/ipsec.h>
#include <netproto/key/key.h>
#endif

#ifdef FAST_IPSEC
#if defined(IPSEC) || defined(IPSEC_ESP)
#error "Bad idea: don't compile with both IPSEC and FAST_IPSEC!"
#endif

#include <netproto/ipsec/ipsec.h>
#include <netproto/ipsec/key.h>
#define IPSEC
#endif /* FAST_IPSEC */

struct in_addr zeroin_addr;

/*
 * These configure the range of local port addresses assigned to
 * "unspecified" outgoing connections/packets/whatever.
 */
int ipport_lowfirstauto = IPPORT_RESERVED - 1;  /* 1023 */
int ipport_lowlastauto = IPPORT_RESERVEDSTART;  /* 600 */

int ipport_firstauto = IPPORT_RESERVED;         /* 1024 */
int ipport_lastauto = IPPORT_USERRESERVED;      /* 5000 */

int ipport_hifirstauto = IPPORT_HIFIRSTAUTO;    /* 49152 */
int ipport_hilastauto = IPPORT_HILASTAUTO;      /* 65535 */

static __inline void
RANGECHK(int var, int min, int max)
{
        if (var < min)
                var = min;
        else if (var > max)
                var = max;
}

static int
sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
{
        int error;

        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);
}

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", "");

/*
 * in_pcb.c: manage the Protocol Control Blocks.
 *
 * NOTE: It is assumed that most of these functions will be called from
 * a critical section.  XXX - There are, unfortunately, a few exceptions
 * to this rule that should be fixed.
 *
 * NOTE: The caller should initialize the cpu field to the cpu running the
 * protocol stack associated with this inpcbinfo.
 */

void
in_pcbinfo_init(struct inpcbinfo *pcbinfo)
{
        LIST_INIT(&pcbinfo->pcblisthead);
        pcbinfo->cpu = -1;
}

/*
 * Allocate a PCB and associate it with the socket.
 */
int
in_pcballoc(struct socket *so, struct inpcbinfo *pcbinfo)
{
        struct inpcb *inp;
#ifdef IPSEC
        int error;
#endif

        inp = zalloc(pcbinfo->ipi_zone);
        if (inp == NULL)
                return (ENOBUFS);
        bzero(inp, sizeof *inp);
        inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
        inp->inp_pcbinfo = inp->inp_cpcbinfo = pcbinfo;
        inp->inp_socket = so;
#ifdef IPSEC
        error = ipsec_init_policy(so, &inp->inp_sp);
        if (error != 0) {
                zfree(pcbinfo->ipi_zone, inp);
                return (error);
        }
#endif
#ifdef INET6
        if (INP_SOCKAF(so) == AF_INET6 && ip6_v6only)
                inp->inp_flags |= IN6P_IPV6_V6ONLY;
        if (ip6_auto_flowlabel)
                inp->inp_flags |= IN6P_AUTOFLOWLABEL;
#endif
        so->so_pcb = inp;
        LIST_INSERT_HEAD(&pcbinfo->pcblisthead, inp, inp_list);
        pcbinfo->ipi_count++;
        return (0);
}

int
in_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
{
        struct socket *so = inp->inp_socket;
        struct proc *p = td->td_proc;
        unsigned short *lastport;
        struct sockaddr_in *sin;
        struct sockaddr_in jsin;
        struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
        struct ucred *cred = NULL;
        u_short lport = 0;
        int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
        int error;

        KKASSERT(p);

        if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */
                return (EADDRNOTAVAIL);
        if (inp->inp_lport != 0 || inp->inp_laddr.s_addr != INADDR_ANY)
                return (EINVAL);        /* already bound */
        if (!(so->so_options & (SO_REUSEADDR|SO_REUSEPORT)))
                wild = 1;    /* neither SO_REUSEADDR nor SO_REUSEPORT is set */
        if (p)
                cred = p->p_ucred;
        if (nam != NULL) {
                sin = (struct sockaddr_in *)nam;
                if (nam->sa_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
                if (!prison_replace_wildcards(td, nam))
                                return (EINVAL);
                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... */
                        bzero(&sin->sin_zero, sizeof sin->sin_zero);
                        if (ifa_ifwithaddr((struct sockaddr *)sin) == NULL)
                                return (EADDRNOTAVAIL);
                }
                if (lport != 0) {
                        struct inpcb *t;

                        /* GROSS */
                        if (ntohs(lport) < IPPORT_RESERVED &&
                            cred && suser_cred(cred, PRISON_ROOT))
                                return (EACCES);
                        if (so->so_cred->cr_uid != 0 &&
                            !IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
                                t = in_pcblookup_local(inp->inp_pcbinfo,
                                    sin->sin_addr, lport,
                                    INPLOOKUP_WILDCARD, cred);
                                if (t &&
                                    (!in_nullhost(sin->sin_addr) ||
                                     !in_nullhost(t->inp_laddr) ||
                                     (t->inp_socket->so_options &
                                         SO_REUSEPORT) == 0) &&
                                    (so->so_cred->cr_uid !=
                                     t->inp_socket->so_cred->cr_uid)) {
#ifdef INET6
                                        if (!in_nullhost(sin->sin_addr) ||
                                            !in_nullhost(t->inp_laddr) ||
                                            INP_SOCKAF(so) ==
                                            INP_SOCKAF(t->inp_socket))
#endif
                                        return (EADDRINUSE);
                                }
                        }
                        if (cred && !prison_replace_wildcards(td, nam))
                                return (EADDRNOTAVAIL);
                        t = in_pcblookup_local(pcbinfo, sin->sin_addr, lport,
                                               wild, cred);
                        if (t && !(reuseport & t->inp_socket->so_options)) {
#ifdef INET6
                                if (!in_nullhost(sin->sin_addr) ||
                                    !in_nullhost(t->inp_laddr) ||
                                    INP_SOCKAF(so) == INP_SOCKAF(t->inp_socket))
#endif
                                return (EADDRINUSE);
                        }
                }
                inp->inp_laddr = sin->sin_addr;
        }
        if (lport == 0) {
                ushort first, last;
                int count;

                jsin.sin_family = AF_INET;
                jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
                if (!prison_replace_wildcards(td, (struct sockaddr *)&jsin)) {
                        inp->inp_laddr.s_addr = INADDR_ANY;
                        return (EINVAL);
                }
                inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;

                inp->inp_flags |= INP_ANONPORT;

                if (inp->inp_flags & INP_HIGHPORT) {
                        first = ipport_hifirstauto;     /* sysctl */
                        last  = ipport_hilastauto;
                        lastport = &pcbinfo->lasthi;
                } else if (inp->inp_flags & INP_LOWPORT) {
                        if (cred &&
                            (error = suser_cred(cred, PRISON_ROOT))) {
                                inp->inp_laddr.s_addr = INADDR_ANY;
                                return (error);
                        }
                        first = ipport_lowfirstauto;    /* 1023 */
                        last  = ipport_lowlastauto;     /* 600 */
                        lastport = &pcbinfo->lastlow;
                } else {
                        first = ipport_firstauto;       /* sysctl */
                        last  = ipport_lastauto;
                        lastport = &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? */
                                        inp->inp_laddr.s_addr = INADDR_ANY;
                                        return (EADDRNOTAVAIL);
                                }
                                --*lastport;
                                if (*lastport > first || *lastport < last)
                                        *lastport = first;
                                lport = htons(*lastport);
                        } while (in_pcblookup_local(pcbinfo, inp->inp_laddr,
                                 lport, wild, cred));
                } else {
                        /*
                         * counting up
                         */
                        count = last - first;

                        do {
                                if (count-- < 0) {      /* completely used? */
                                        inp->inp_laddr.s_addr = INADDR_ANY;
                                        return (EADDRNOTAVAIL);
                                }
                                ++*lastport;
                                if (*lastport < first || *lastport > last)
                                        *lastport = first;
                                lport = htons(*lastport);
                        } while (in_pcblookup_local(pcbinfo, inp->inp_laddr,
                                 lport, wild, cred));
                }
        }
        inp->inp_lport = lport;

        jsin.sin_family = AF_INET;
        jsin.sin_addr.s_addr = inp->inp_laddr.s_addr;
        if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin)) {
                inp->inp_laddr.s_addr = INADDR_ANY;
                inp->inp_lport = 0;
                return (EINVAL);
        }
        inp->inp_laddr.s_addr = jsin.sin_addr.s_addr;

        if (in_pcbinsporthash(inp) != 0) {
                inp->inp_laddr.s_addr = INADDR_ANY;
                inp->inp_lport = 0;
                return (EAGAIN);
        }
        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(struct inpcb *inp, struct sockaddr *nam,
        struct sockaddr_in **plocal_sin, struct thread *td)
{
        struct in_ifaddr *ia;
        struct ucred *cred = NULL;
        struct sockaddr_in *sin = (struct sockaddr_in *)nam;
        struct sockaddr *jsin;
        int jailed = 0;

        if (nam->sa_len != sizeof *sin)
                return (EINVAL);
        if (sin->sin_family != AF_INET)
                return (EAFNOSUPPORT);
        if (sin->sin_port == 0)
                return (EADDRNOTAVAIL);
        if (td && td->td_proc && td->td_proc->p_ucred)
                cred = td->td_proc->p_ucred;
        if (cred && cred->cr_prison)
                jailed = 1;
        if (!TAILQ_EMPTY(&in_ifaddrhead)) {
                ia = TAILQ_FIRST(&in_ifaddrhead);
                /*
                 * 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.
                 */
                if (sin->sin_addr.s_addr == INADDR_ANY)
                        sin->sin_addr = IA_SIN(ia)->sin_addr;
                else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
                    (ia->ia_ifp->if_flags & IFF_BROADCAST))
                        sin->sin_addr = satosin(&ia->ia_broadaddr)->sin_addr;
        }
        if (inp->inp_laddr.s_addr == INADDR_ANY) {
                struct route *ro;

                ia = (struct in_ifaddr *)NULL;
                /*
                 * If route is known or can be allocated now,
                 * our src addr is taken from the i/f, else punt.
                 * Note that we should check the address family of the cached
                 * destination, in case of sharing the cache with IPv6.
                 */
                ro = &inp->inp_route;
                if (ro->ro_rt &&
                    (!(ro->ro_rt->rt_flags & RTF_UP) ||
                     ro->ro_dst.sa_family != AF_INET ||
                     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 *)NULL;
                }
                if (!(inp->inp_socket->so_options & SO_DONTROUTE) && /*XXX*/
                    (ro->ro_rt == (struct rtentry *)NULL ||
                    ro->ro_rt->rt_ifp == (struct ifnet *)NULL)) {
                        /* No route yet, so try to acquire one */
                        bzero(&ro->ro_dst, sizeof(struct sockaddr_in));
                        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)) {
                        if (jailed) {
                                if (jailed_ip(cred->cr_prison, 
                                    ro->ro_rt->rt_ifa->ifa_addr)) {
                                        ia = ifatoia(ro->ro_rt->rt_ifa);
                                }
                        } else {
                                ia = ifatoia(ro->ro_rt->rt_ifa);
                        }
                }
                if (ia == NULL) {
                        u_short fport = sin->sin_port;

                        sin->sin_port = 0;
                        ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
                        if (ia && jailed && !jailed_ip(cred->cr_prison,
                            sintosa(&ia->ia_addr)))
                                ia = NULL;
                        if (ia == NULL)
                                ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
                        if (ia && jailed && !jailed_ip(cred->cr_prison,
                            sintosa(&ia->ia_addr)))
                                ia = NULL;
                        sin->sin_port = fport;
                        if (ia == NULL)
                                ia = TAILQ_FIRST(&in_ifaddrhead);
                        if (ia && jailed && !jailed_ip(cred->cr_prison,
                            sintosa(&ia->ia_addr)))
                                ia = NULL;

                        if (!jailed && ia == NULL)
                                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 (!jailed && 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;
                                TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
                                        if (ia->ia_ifp == ifp)
                                                break;
                                if (ia == NULL)
                                        return (EADDRNOTAVAIL);
                        }
                }
                /*
                 * Don't do pcblookup call here; return interface in plocal_sin
                 * and exit to caller, that will do the lookup.
                 */
                if (ia == NULL && jailed) {
                        if ((jsin = prison_get_nonlocal(cred->cr_prison, AF_INET, NULL)) != NULL ||
                            (jsin = prison_get_local(cred->cr_prison, AF_INET, NULL)) != NULL)
                                *plocal_sin = satosin(jsin);
                        else
                                /* IPv6 only Jail */
                                return (EADDRNOTAVAIL);
                } else {
                        *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(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
{
        struct sockaddr_in *if_sin;
        struct sockaddr_in *sin = (struct sockaddr_in *)nam;
        int error;

        /* Call inner routine to assign local interface address. */
        if ((error = in_pcbladdr(inp, nam, &if_sin, td)) != 0)
                return (error);

        if (in_pcblookup_hash(inp->inp_cpcbinfo, sin->sin_addr, sin->sin_port,
            inp->inp_laddr.s_addr ? inp->inp_laddr : if_sin->sin_addr,
            inp->inp_lport, FALSE, NULL) != NULL) {
                return (EADDRINUSE);
        }
        if (inp->inp_laddr.s_addr == INADDR_ANY) {
                if (inp->inp_lport == 0) {
                        error = in_pcbbind(inp, (struct sockaddr *)NULL, td);
                        if (error)
                                return (error);
                }
                inp->inp_laddr = if_sin->sin_addr;
        }
        inp->inp_faddr = sin->sin_addr;
        inp->inp_fport = sin->sin_port;
        in_pcbinsconnhash(inp);
        return (0);
}

void
in_pcbdisconnect(struct inpcb *inp)
{

        inp->inp_faddr.s_addr = INADDR_ANY;
        inp->inp_fport = 0;
        in_pcbremconnhash(inp);
        if (inp->inp_socket->so_state & SS_NOFDREF)
                in_pcbdetach(inp);
}

void
in_pcbdetach(struct inpcb *inp)
{
        struct socket *so = inp->inp_socket;
        struct inpcbinfo *ipi = inp->inp_pcbinfo;

#ifdef IPSEC
        ipsec4_delete_pcbpolicy(inp);
#endif /*IPSEC*/
        inp->inp_gencnt = ++ipi->ipi_gencnt;
        in_pcbremlists(inp);
        so->so_pcb = 0;
        sofree(so);
        if (inp->inp_options)
                m_free(inp->inp_options);
        if (inp->inp_route.ro_rt)
                rtfree(inp->inp_route.ro_rt);
        ip_freemoptions(inp->inp_moptions);
        inp->inp_vflag = 0;
        zfree(ipi->ipi_zone, inp);
}

/*
 * The calling convention of in_setsockaddr() and in_setpeeraddr() was
 * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 * in struct pr_usrreqs, so that protocols can just reference then directly
 * without the need for a wrapper function.  The socket must have a valid
 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 * except through a kernel programming error, so it is acceptable to panic
 * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 * because there actually /is/ a programming error somewhere... XXX)
 */
int
in_setsockaddr(struct socket *so, struct sockaddr **nam)
{
        struct inpcb *inp;
        struct sockaddr_in *sin;

        /*
         * Do the malloc first in case it blocks.
         */
        MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
                M_WAITOK | M_ZERO);
        sin->sin_family = AF_INET;
        sin->sin_len = sizeof *sin;

        crit_enter();
        inp = so->so_pcb;
        if (!inp) {
                crit_exit();
                kfree(sin, M_SONAME);
                return (ECONNRESET);
        }
        sin->sin_port = inp->inp_lport;
        sin->sin_addr = inp->inp_laddr;
        crit_exit();

        *nam = (struct sockaddr *)sin;
        return (0);
}

int
in_setpeeraddr(struct socket *so, struct sockaddr **nam)
{
        struct inpcb *inp;
        struct sockaddr_in *sin;

        /*
         * Do the malloc first in case it blocks.
         */
        MALLOC(sin, struct sockaddr_in *, sizeof *sin, M_SONAME,
                M_WAITOK | M_ZERO);
        sin->sin_family = AF_INET;
        sin->sin_len = sizeof *sin;

        crit_enter();
        inp = so->so_pcb;
        if (!inp) {
                crit_exit();
                kfree(sin, M_SONAME);
                return (ECONNRESET);
        }
        sin->sin_port = inp->inp_fport;
        sin->sin_addr = inp->inp_faddr;
        crit_exit();

        *nam = (struct sockaddr *)sin;
        return (0);
}

void
in_pcbnotifyall(struct inpcbhead *head, struct in_addr faddr, int err,
                void (*notify)(struct inpcb *, int))
{
        struct inpcb *inp, *ninp;

        /*
         * note: if INP_PLACEMARKER is set we must ignore the rest of
         * the structure and skip it.
         */
        crit_enter();
        LIST_FOREACH_MUTABLE(inp, head, inp_list, ninp) {
                if (inp->inp_flags & INP_PLACEMARKER)
                        continue;
#ifdef INET6
                if (!(inp->inp_vflag & INP_IPV4))
                        continue;
#endif
                if (inp->inp_faddr.s_addr != faddr.s_addr ||
                    inp->inp_socket == NULL)
                        continue;
                (*notify)(inp, err);            /* can remove inp from list! */
        }
        crit_exit();
}

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

        for (inp = head; inp != NULL; inp = LIST_NEXT(inp, inp_list)) {
                if (inp->inp_flags & INP_PLACEMARKER)
                        continue;
                imo = inp->inp_moptions;
                if ((inp->inp_vflag & INP_IPV4) && 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;
                }
        }
}

/*
 * 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 rtinfo;

        if ((rt = inp->inp_route.ro_rt)) {
                bzero(&rtinfo, sizeof(struct rt_addrinfo));
                rtinfo.rti_info[RTAX_DST] = rt_key(rt);
                rtinfo.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
                rtinfo.rti_info[RTAX_NETMASK] = rt_mask(rt);
                rtinfo.rti_flags = rt->rt_flags;
                rt_missmsg(RTM_LOSING, &rtinfo, rt->rt_flags, 0);
                if (rt->rt_flags & RTF_DYNAMIC)
                        rtrequest1_global(RTM_DELETE, &rtinfo, NULL, NULL);
                inp->inp_route.ro_rt = NULL;
                rtfree(rt);
                /*
                 * A new route can be allocated
                 * the next time output is attempted.
                 */
        }
}

/*
 * After a routing change, flush old routing
 * and allocate a (hopefully) better one.
 */
void
in_rtchange(struct inpcb *inp, int err)
{
        if (inp->inp_route.ro_rt) {
                rtfree(inp->inp_route.ro_rt);
                inp->inp_route.ro_rt = NULL;
                /*
                 * A new route can be allocated the next time
                 * output is attempted.
                 */
        }
}

/*
 * Lookup a PCB based on the local address and port.
 */
struct inpcb *
in_pcblookup_local(struct inpcbinfo *pcbinfo, struct in_addr laddr,
                   u_int lport_arg, int wild_okay, struct ucred *cred)
{
        struct inpcb *inp;
        int matchwild = 3, wildcard;
        u_short lport = lport_arg;

        struct inpcbporthead *porthash;
        struct inpcbport *phd;
        struct inpcb *match = NULL;

        /*
         * Best fit PCB lookup.
         *
         * First see if this local port is in use by looking on the
         * port hash list.
         */
        porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
            pcbinfo->porthashmask)];
        LIST_FOREACH(phd, porthash, phd_hash) {
                if (phd->phd_port == lport)
                        break;
        }
        if (phd != NULL) {
                /*
                 * Port is in use by one or more PCBs. Look for best
                 * fit.
                 */
                LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
                        wildcard = 0;
#ifdef INET6
                        if ((inp->inp_vflag & INP_IPV4) == 0)
                                continue;
#endif
                        if (inp->inp_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)
                                continue;
                        if (wildcard < matchwild &&
                            (cred == NULL ||
                             cred->cr_prison == 
                                        inp->inp_socket->so_cred->cr_prison)) {
                                match = inp;
                                matchwild = wildcard;
                                if (matchwild == 0) {
                                        break;
                                }
                        }
                }
        }
        return (match);
}

/*
 * Lookup PCB in hash list.
 */
struct inpcb *
in_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in_addr faddr, u_int fport_arg,
                  struct in_addr laddr, u_int lport_arg, boolean_t wildcard,
                  struct ifnet *ifp)
{
        struct inpcbhead *head;
        struct inpcb *inp, *jinp=NULL;
        u_short fport = fport_arg, lport = lport_arg;

        /*
         * First look for an exact match.
         */
        head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr.s_addr, fport,
            laddr.s_addr, lport, pcbinfo->hashmask)];
        LIST_FOREACH(inp, head, inp_hash) {
#ifdef INET6
                if (!(inp->inp_vflag & INP_IPV4))
                        continue;
#endif
                if (in_hosteq(inp->inp_faddr, faddr) &&
                    in_hosteq(inp->inp_laddr, laddr) &&
                    inp->inp_fport == fport && inp->inp_lport == lport) {
                        /* found */
                        if (inp->inp_socket == NULL ||
                            inp->inp_socket->so_cred->cr_prison == NULL) {
                                return (inp);
                        } else {
                                if  (jinp == NULL)
                                        jinp = inp;
                        }
                }
        }
        if (jinp != NULL)
                return (jinp);
        if (wildcard) {
                struct inpcb *local_wild = NULL;
                struct inpcb *jinp_wild = NULL;
#ifdef INET6
                struct inpcb *local_wild_mapped = NULL;
#endif
                struct inpcontainer *ic;
                struct inpcontainerhead *chead;
                struct sockaddr_in jsin;
                struct ucred *cred;

                /*
                 * Order of socket selection:
                 * 1. non-jailed, non-wild.
                 * 2. non-jailed, wild.
                 * 3. jailed, non-wild.
                 * 4. jailed, wild.
                 */
                jsin.sin_family = AF_INET;
                chead = &pcbinfo->wildcardhashbase[
                    INP_PCBWILDCARDHASH(lport, pcbinfo->wildcardhashmask)];
                LIST_FOREACH(ic, chead, ic_list) {
                        inp = ic->ic_inp;
                        jsin.sin_addr.s_addr = laddr.s_addr;
#ifdef INET6
                        if (!(inp->inp_vflag & INP_IPV4))
                                continue;
#endif
                        if (inp->inp_socket != NULL)
                                cred = inp->inp_socket->so_cred;
                        else
                                cred = NULL;
                        if (cred != NULL && jailed(cred)) {
                                if (jinp != NULL)
                                        continue;
                                else
                                        if (!jailed_ip(cred->cr_prison,
                                            (struct sockaddr *)&jsin))
                                                continue;
                        }
                        if (inp->inp_lport == lport) {
                                if (ifp && ifp->if_type == IFT_FAITH &&
                                    !(inp->inp_flags & INP_FAITH))
                                        continue;
                                if (inp->inp_laddr.s_addr == laddr.s_addr) {
                                        if (cred != NULL && jailed(cred))
                                                jinp = inp;
                                        else
                                                return (inp);
                                }
                                if (inp->inp_laddr.s_addr == INADDR_ANY) {
#ifdef INET6
                                        if (INP_CHECK_SOCKAF(inp->inp_socket,
                                                             AF_INET6))
                                                local_wild_mapped = inp;
                                        else
#endif
                                                if (cred != NULL &&
                                                    jailed(cred))
                                                        jinp_wild = inp;
                                                else
                                                        local_wild = inp;
                                }
                        }
                }
                if (local_wild != NULL)
                        return (local_wild);
#ifdef INET6
                if (local_wild_mapped != NULL)
                        return (local_wild_mapped);
#endif
                if (jinp != NULL)
                        return (jinp);
                return (jinp_wild);
        }

        /*
         * Not found.
         */
        return (NULL);
}

/*
 * Insert PCB into connection hash table.
 */
void
in_pcbinsconnhash(struct inpcb *inp)
{
        struct inpcbinfo *pcbinfo = inp->inp_cpcbinfo;
        struct inpcbhead *bucket;
        u_int32_t hashkey_faddr, hashkey_laddr;

#ifdef INET6
        if (inp->inp_vflag & INP_IPV6) {
                hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX JH */;
                hashkey_laddr = inp->in6p_laddr.s6_addr32[3] /* XXX JH */;
        } else {
#endif
                hashkey_faddr = inp->inp_faddr.s_addr;
                hashkey_laddr = inp->inp_laddr.s_addr;
#ifdef INET6
        }
#endif

        KASSERT(!(inp->inp_flags & INP_CONNECTED), ("already on hash list"));
        inp->inp_flags |= INP_CONNECTED;

        /*
         * Insert into the connection hash table.
         */
        bucket = &pcbinfo->hashbase[INP_PCBCONNHASH(hashkey_faddr,
            inp->inp_fport, hashkey_laddr, inp->inp_lport, pcbinfo->hashmask)];
        LIST_INSERT_HEAD(bucket, inp, inp_hash);
}

/*
 * Remove PCB from connection hash table.
 */
void
in_pcbremconnhash(struct inpcb *inp)
{
        KASSERT(inp->inp_flags & INP_CONNECTED, ("inp not connected"));
        LIST_REMOVE(inp, inp_hash);
        inp->inp_flags &= ~INP_CONNECTED;
}

/*
 * Insert PCB into port hash table.
 */
int
in_pcbinsporthash(struct inpcb *inp)
{
        struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
        struct inpcbporthead *pcbporthash;
        struct inpcbport *phd;

        /*
         * Insert into the port hash table.
         */
        pcbporthash = &pcbinfo->porthashbase[
            INP_PCBPORTHASH(inp->inp_lport, pcbinfo->porthashmask)];

        /* Go through port list and look for a head for this lport. */
        LIST_FOREACH(phd, pcbporthash, phd_hash)
                if (phd->phd_port == inp->inp_lport)
                        break;

        /* If none exists, malloc one and tack it on. */
        if (phd == NULL) {
                MALLOC(phd, struct inpcbport *, sizeof(struct inpcbport),
                    M_PCB, M_INTWAIT | M_NULLOK);
                if (phd == NULL)
                        return (ENOBUFS); /* XXX */
                phd->phd_port = inp->inp_lport;
                LIST_INIT(&phd->phd_pcblist);
                LIST_INSERT_HEAD(pcbporthash, phd, phd_hash);
        }

        inp->inp_phd = phd;
        LIST_INSERT_HEAD(&phd->phd_pcblist, inp, inp_portlist);

        return (0);
}

void
in_pcbinswildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
{
        struct inpcontainer *ic;
        struct inpcontainerhead *bucket;

        bucket = &pcbinfo->wildcardhashbase[
            INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];

        ic = kmalloc(sizeof(struct inpcontainer), M_TEMP, M_INTWAIT);
        ic->ic_inp = inp;
        LIST_INSERT_HEAD(bucket, ic, ic_list);
}

/*
 * Insert PCB into wildcard hash table.
 */
void
in_pcbinswildcardhash(struct inpcb *inp)
{
        struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
        
        KKASSERT(pcbinfo != NULL);

        in_pcbinswildcardhash_oncpu(inp, pcbinfo);
        inp->inp_flags |= INP_WILDCARD;
}

void
in_pcbremwildcardhash_oncpu(struct inpcb *inp, struct inpcbinfo *pcbinfo)
{
        struct inpcontainer *ic;
        struct inpcontainerhead *head;

        /* find bucket */
        head = &pcbinfo->wildcardhashbase[
            INP_PCBWILDCARDHASH(inp->inp_lport, pcbinfo->wildcardhashmask)];

        LIST_FOREACH(ic, head, ic_list) {
                if (ic->ic_inp == inp)
                        goto found;
        }
        return;                 /* not found! */

found:
        LIST_REMOVE(ic, ic_list);       /* remove container from bucket chain */
        kfree(ic, M_TEMP);              /* deallocate container */
}

/*
 * Remove PCB from wildcard hash table.
 */
void
in_pcbremwildcardhash(struct inpcb *inp)
{
        struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;

        KASSERT(inp->inp_flags & INP_WILDCARD, ("inp not wildcard"));
        in_pcbremwildcardhash_oncpu(inp, pcbinfo);
        inp->inp_flags &= ~INP_WILDCARD;
}

/*
 * Remove PCB from various lists.
 */
void
in_pcbremlists(struct inpcb *inp)
{
        if (inp->inp_lport) {
                struct inpcbport *phd = inp->inp_phd;

                LIST_REMOVE(inp, inp_portlist);
                if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
                        LIST_REMOVE(phd, phd_hash);
                        kfree(phd, M_PCB);
                }
        }
        if (inp->inp_flags & INP_WILDCARD) {
                in_pcbremwildcardhash(inp);
        } else if (inp->inp_flags & INP_CONNECTED) {
                in_pcbremconnhash(inp);
        }
        LIST_REMOVE(inp, inp_list);
        inp->inp_pcbinfo->ipi_count--;
}

int
prison_xinpcb(struct thread *td, struct inpcb *inp)
{
        struct ucred *cr;

        if (td->td_proc == NULL)
                return (0);
        cr = td->td_proc->p_ucred;
        if (cr->cr_prison == NULL)
                return (0);
        if (inp->inp_socket && inp->inp_socket->so_cred &&
            inp->inp_socket->so_cred->cr_prison &&
            cr->cr_prison == inp->inp_socket->so_cred->cr_prison)
                return (0);
        return (1);
}

int
in_pcblist_global(SYSCTL_HANDLER_ARGS)
{
        struct inpcbinfo *pcbinfo = arg1;
        struct inpcb *inp, *marker;
        struct xinpcb xi;
        int error, i, n;
        inp_gen_t gencnt;

        /*
         * The process of preparing the TCB list is too time-consuming and
         * resource-intensive to repeat twice on every request.
         */
        if (req->oldptr == NULL) {
                n = pcbinfo->ipi_count;
                req->oldidx = (n + n/8 + 10) * sizeof(struct xinpcb);
                return 0;
        }

        if (req->newptr != NULL)
                return EPERM;

        /*
         * OK, now we're committed to doing something.  Re-fetch ipi_count
         * after obtaining the generation count.
         */
        gencnt = pcbinfo->ipi_gencnt;
        n = pcbinfo->ipi_count;

        marker = kmalloc(sizeof(struct inpcb), M_TEMP, M_WAITOK|M_ZERO);
        marker->inp_flags |= INP_PLACEMARKER;
        LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);

        i = 0;
        error = 0;

        while ((inp = LIST_NEXT(marker, inp_list)) != NULL && i < n) {
                LIST_REMOVE(marker, inp_list);
                LIST_INSERT_AFTER(inp, marker, inp_list);

                if (inp->inp_flags & INP_PLACEMARKER)
                        continue;
                if (inp->inp_gencnt > gencnt)
                        continue;
                if (prison_xinpcb(req->td, inp))
                        continue;
                bzero(&xi, sizeof xi);
                xi.xi_len = sizeof xi;
                bcopy(inp, &xi.xi_inp, sizeof *inp);
                if (inp->inp_socket)
                        sotoxsocket(inp->inp_socket, &xi.xi_socket);
                if ((error = SYSCTL_OUT(req, &xi, sizeof xi)) != 0)
                        break;
                ++i;
        }
        LIST_REMOVE(marker, inp_list);
        if (error == 0 && i < n) {
                bzero(&xi, sizeof xi);
                xi.xi_len = sizeof xi;
                while (i < n) {
                        error = SYSCTL_OUT(req, &xi, sizeof xi);
                        ++i;
                }
        }
        kfree(marker, M_TEMP);
        return(error);
}