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//==========================================================================
//
//      src/sys/netinet/in_pcb.c
//
//==========================================================================
//####BSDCOPYRIGHTBEGIN####
//
// -------------------------------------------
//
// Portions of this software may have been derived from OpenBSD, 
// FreeBSD or other sources, and are covered by the appropriate
// copyright disclaimers included herein.
//
// Portions created by Red Hat are
// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
//
// -------------------------------------------
//
//####BSDCOPYRIGHTEND####
//==========================================================================
 
/*
 * 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 1.59.2.17 2001/08/13 16:26:17 ume Exp $
 */
 
#include <sys/param.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 <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 <netkey/key.h>
#endif /* 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 */
 
 
/*
 * in_pcb.c: manage the Protocol Control Blocks.
 *
 * NOTE: It is assumed that most of these functions will be called at
 * splnet(). XXX - There are, unfortunately, a few exceptions to this
 * rule that should be fixed.
 */
 
/*
 * Allocate a PCB and associate it with the socket.
 */
int
in_pcballoc(so, pcbinfo, p)
        struct socket *so;
        struct inpcbinfo *pcbinfo;
        struct proc *p;
{
        register struct inpcb *inp;
#ifdef IPSEC
        int error;
#endif
 
        inp = zalloci(pcbinfo->ipi_zone);
        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;
#ifdef IPSEC
        error = ipsec_init_policy(so, &inp->inp_sp);
        if (error != 0) {
                zfreei(pcbinfo->ipi_zone, inp);
                return error;
        }
#endif /*IPSEC*/
#if defined(INET6)
        if (INP_SOCKAF(so) == AF_INET6 && !ip6_mapped_addr_on)
                inp->inp_flags |= IN6P_IPV6_V6ONLY;
#endif
        LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list);
        pcbinfo->ipi_count++;
        so->so_pcb = (caddr_t)inp;
#ifdef INET6
        if (ip6_auto_flowlabel)
                inp->inp_flags |= IN6P_AUTOFLOWLABEL;
#endif
        return (0);
}
 
int
in_pcbbind(inp, nam, p)
        register struct inpcb *inp;
        struct sockaddr *nam;
        struct proc *p;
{
        register struct socket *so = inp->inp_socket;
        unsigned short *lastport;
        struct sockaddr_in *sin;
        struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
        u_short lport = 0;
        int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 
        if (TAILQ_EMPTY(&in_ifaddrhead)) /* XXX broken! */
                return (EADDRNOTAVAIL);
        if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY)
                return (EINVAL);
        if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
                wild = 1;
        if (nam) {
                sin = (struct sockaddr_in *)nam;
        // HACK
        if (nam->sa_len == 0) nam->sa_len = sizeof(*sin);
        // HACK
                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
                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 */
                        t = in_pcblookup_local(pcbinfo, sin->sin_addr, lport, wild);
                        if (t &&
                            (reuseport & t->inp_socket->so_options) == 0) {
#if defined(INET6)
                                if (ntohl(sin->sin_addr.s_addr) !=
                                    INADDR_ANY ||
                                    ntohl(t->inp_laddr.s_addr) !=
                                    INADDR_ANY ||
                                    INP_SOCKAF(so) ==
                                    INP_SOCKAF(t->inp_socket))
#endif /* defined(INET6) */
                                return (EADDRINUSE);
                        }
                }
                inp->inp_laddr = sin->sin_addr;
        }
        if (lport == 0) {
                u_short first, last;
                int count;
 
                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) {
                        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));
                } 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));
                }
        }
        inp->inp_lport = lport;
        if (in_pcbinshash(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(inp, nam, plocal_sin)
        register struct inpcb *inp;
        struct sockaddr *nam;
        struct sockaddr_in **plocal_sin;
{
        struct in_ifaddr *ia;
        register struct sockaddr_in *sin = (struct sockaddr_in *)nam;
 
        if (nam->sa_len != sizeof (*sin))
                return (EINVAL);
        if (sin->sin_family != AF_INET)
                return (EAFNOSUPPORT);
        if (sin->sin_port == 0)
                return (EADDRNOTAVAIL);
        if (!TAILQ_EMPTY(&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.
                 */
#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(TAILQ_FIRST(&in_ifaddrhead))->sin_addr;
                else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
                  (TAILQ_FIRST(&in_ifaddrhead)->ia_ifp->if_flags & IFF_BROADCAST))
                    sin->sin_addr = satosin(&TAILQ_FIRST(&in_ifaddrhead)->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 = TAILQ_FIRST(&in_ifaddrhead);
                        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;
                                TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
                                        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, p)
        register struct inpcb *inp;
        struct sockaddr *nam;
        struct proc *p;
{
        struct sockaddr_in *ifaddr;
        struct sockaddr_in *sin = (struct sockaddr_in *)nam;
        int error;
 
        /*
         *   Call inner routine, to assign local interface address.
         */
        if ((error = in_pcbladdr(inp, nam, &ifaddr)) != 0)
                return(error);
 
        if (in_pcblookup_hash(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) != NULL) {
                return (EADDRINUSE);
        }
        if (inp->inp_laddr.s_addr == INADDR_ANY) {
                if (inp->inp_lport == 0) {
                        error = in_pcbbind(inp, (struct sockaddr *)0, p);
                        if (error)
                            return (error);
                }
                inp->inp_laddr = ifaddr->sin_addr;
        }
        inp->inp_faddr = sin->sin_addr;
        inp->inp_fport = sin->sin_port;
        in_pcbrehash(inp);
#ifdef IPSEC
        if (inp->inp_socket->so_type == SOCK_STREAM)
                ipsec_pcbconn(inp->inp_sp);
#endif
        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);
#ifdef IPSEC
        ipsec_pcbdisconn(inp->inp_sp);
#endif
}
 
void
in_pcbdetach(inp)
        struct inpcb *inp;
{
        struct socket *so = inp->inp_socket;
        struct inpcbinfo *ipi = inp->inp_pcbinfo;
        struct rtentry *rt  = inp->inp_route.ro_rt;
 
#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)
                (void)m_free(inp->inp_options);
        if (rt) {
                /*
                 * route deletion requires reference count to be <= zero
                 */
                if ((rt->rt_flags & RTF_DELCLONE) &&
                    (rt->rt_flags & RTF_WASCLONED) &&
                    (rt->rt_refcnt <= 1)) {
                        rt->rt_refcnt--;
                        rt->rt_flags &= ~RTF_UP;
                        rtrequest(RTM_DELETE, rt_key(rt),
                                  rt->rt_gateway, rt_mask(rt),
                                  rt->rt_flags, (struct rtentry **)0);
                }
                else
                        rtfree(rt);
        }
        ip_freemoptions(inp->inp_moptions);
        inp->inp_vflag = 0;
        zfreei(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(so, nam)
        struct socket *so;
        struct sockaddr **nam;
{
        int s;
        register struct inpcb *inp;
        register 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);
 
        s = splnet();
        inp = sotoinpcb(so);
        if (!inp) {
                splx(s);
                free(sin, M_SONAME);
                return ECONNRESET;
        }
        sin->sin_port = inp->inp_lport;
        sin->sin_addr = inp->inp_laddr;
        splx(s);
 
        *nam = (struct sockaddr *)sin;
        return 0;
}
 
int
in_setpeeraddr(so, nam)
        struct socket *so;
        struct sockaddr **nam;
{
        int s;
        struct inpcb *inp;
        register 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);
 
        s = splnet();
        inp = sotoinpcb(so);
        if (!inp) {
                splx(s);
                free(sin, M_SONAME);
                return ECONNRESET;
        }
        sin->sin_port = inp->inp_fport;
        sin->sin_addr = inp->inp_faddr;
        splx(s);
 
        *nam = (struct sockaddr *)sin;
        return 0;
}
 
void
in_pcbnotifyall(head, faddr, _errno, notify)
        struct inpcbhead *head;
        struct in_addr faddr;
        void (*notify) __P((struct inpcb *, int));
{
        struct inpcb *inp, *ninp;
        int s;
 
        s = splnet();
        for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
                ninp = LIST_NEXT(inp, inp_list);
#ifdef INET6
                if ((inp->inp_vflag & INP_IPV4) == 0)
                        continue;
#endif
                if (inp->inp_faddr.s_addr != faddr.s_addr ||
                    inp->inp_socket == NULL)
                                continue;
                (*notify)(inp, _errno);
        }
        splx(s);
}
 
void
in_pcbpurgeif0(head, ifp)
        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)) {
                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(inp)
        struct inpcb *inp;
{
        register struct rtentry *rt;
        struct rt_addrinfo info;
 
        if ((rt = inp->inp_route.ro_rt)) {
                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);
                inp->inp_route.ro_rt = 0;
                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(inp, _errno)
        register struct inpcb *inp;
        int _errno;
{
        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.
                 */
        }
}
 
/*
 * Lookup a PCB based on the local address and port.
 */
struct inpcb *
in_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
        struct inpcbinfo *pcbinfo;
        struct in_addr laddr;
        u_int lport_arg;
        int wild_okay;
{
        register struct inpcb *inp;
        int matchwild = 3, wildcard;
        u_short lport = lport_arg;
 
        if (!wild_okay) {
                struct inpcbhead *head;
                /*
                 * Look for an unconnected (wildcard foreign addr) PCB that
                 * matches the local address and port we're looking for.
                 */
                head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
                LIST_FOREACH(inp, head, inp_hash) {
#ifdef INET6
                        if ((inp->inp_vflag & INP_IPV4) == 0)
                                continue;
#endif
                        if (inp->inp_faddr.s_addr == INADDR_ANY &&
                            inp->inp_laddr.s_addr == laddr.s_addr &&
                            inp->inp_lport == lport) {
                                /*
                                 * Found.
                                 */
                                return (inp);
                        }
                }
                /*
                 * Not found.
                 */
                return (NULL);
        } else {
                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 < matchwild) {
                                        match = inp;
                                        matchwild = wildcard;
                                        if (matchwild == 0) {
                                                break;
                                        }
                                }
                        }
                }
                return (match);
        }
}
 
/*
 * Lookup PCB in hash list.
 */
struct inpcb *
in_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard,
                  ifp)
        struct inpcbinfo *pcbinfo;
        struct in_addr faddr, laddr;
        u_int fport_arg, lport_arg;
        int wildcard;
        struct ifnet *ifp;
{
        struct inpcbhead *head;
        register struct inpcb *inp;
        u_short fport = fport_arg, lport = lport_arg;
 
        /*
         * First look for an exact match.
         */
        head = &pcbinfo->hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, pcbinfo->hashmask)];
        LIST_FOREACH(inp, head, inp_hash) {
#ifdef INET6
                if ((inp->inp_vflag & INP_IPV4) == 0)
                        continue;
#endif
                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) {
                        /*
                         * Found.
                         */
                        return (inp);
                }
        }
        if (wildcard) {
                struct inpcb *local_wild = NULL;
#if defined(INET6)
                struct inpcb *local_wild_mapped = NULL;
#endif /* defined(INET6) */
 
                head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
                LIST_FOREACH(inp, head, inp_hash) {
#ifdef INET6
                        if ((inp->inp_vflag & INP_IPV4) == 0)
                                continue;
#endif
                        if (inp->inp_faddr.s_addr == INADDR_ANY &&
                            inp->inp_lport == lport) {
#if defined(NFAITH) && NFAITH > 0
                                if (ifp && ifp->if_type == IFT_FAITH &&
                                    (inp->inp_flags & INP_FAITH) == 0)
                                        continue;
#endif
                                if (inp->inp_laddr.s_addr == laddr.s_addr)
                                        return (inp);
                                else if (inp->inp_laddr.s_addr == INADDR_ANY) {
#if defined(INET6)
                                        if (INP_CHECK_SOCKAF(inp->inp_socket,
                                                             AF_INET6))
                                                local_wild_mapped = inp;
                                        else
#endif /* defined(INET6) */
                                        local_wild = inp;
                                }
                        }
                }
#if defined(INET6)
                if (local_wild == NULL)
                        return (local_wild_mapped);
#endif /* defined(INET6) */
                return (local_wild);
        }
 
        /*
         * Not found.
         */
        return (NULL);
}
 
/*
 * Insert PCB onto various hash lists.
 */
int
in_pcbinshash(inp)
        struct inpcb *inp;
{
        struct inpcbhead *pcbhash;
        struct inpcbporthead *pcbporthash;
        struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
        struct inpcbport *phd;
        u_int32_t hashkey_faddr;
 
#ifdef INET6
        if (inp->inp_vflag & INP_IPV6)
                hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
        else
#endif /* INET6 */
        hashkey_faddr = inp->inp_faddr.s_addr;
 
        pcbhash = &pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr,
                 inp->inp_lport, inp->inp_fport, pcbinfo->hashmask)];
 
        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_NOWAIT);
                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);
        LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
        return (0);
}
 
/*
 * Move PCB to the proper hash bucket when { faddr, fport } have  been
 * changed. NOTE: This does not handle the case of the lport changing (the
 * hashed port list would have to be updated as well), so the lport must
 * not change after in_pcbinshash() has been called.
 */
void
in_pcbrehash(inp)
        struct inpcb *inp;
{
        struct inpcbhead *head;
        u_int32_t hashkey_faddr;
 
#ifdef INET6
        if (inp->inp_vflag & INP_IPV6)
                hashkey_faddr = inp->in6p_faddr.s6_addr32[3] /* XXX */;
        else
#endif /* INET6 */
        hashkey_faddr = inp->inp_faddr.s_addr;
 
        head = &inp->inp_pcbinfo->hashbase[INP_PCBHASH(hashkey_faddr,
                inp->inp_lport, inp->inp_fport, inp->inp_pcbinfo->hashmask)];
 
        LIST_REMOVE(inp, inp_hash);
        LIST_INSERT_HEAD(head, inp, inp_hash);
}
 
/*
 * Remove PCB from various lists.
 */
void
in_pcbremlists(inp)
        struct inpcb *inp;
{
        inp->inp_gencnt = ++inp->inp_pcbinfo->ipi_gencnt;
        if (inp->inp_lport) {
                struct inpcbport *phd = inp->inp_phd;
 
                LIST_REMOVE(inp, inp_hash);
                LIST_REMOVE(inp, inp_portlist);
                if (LIST_FIRST(&phd->phd_pcblist) == NULL) {
                        LIST_REMOVE(phd, phd_hash);
                        free(phd, M_PCB);
                }
        }
        LIST_REMOVE(inp, inp_list);
        inp->inp_pcbinfo->ipi_count--;
}
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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [net/] [bsd_tcpip/] [v2_0/] [src/] [sys/] [netinet/] [in_pcb.c] - Blame information for rev 307

Line No.	Rev	Author	Line
1	27	unneback	`//==========================================================================`
2			`//`
3			`// src/sys/netinet/in_pcb.c`
4			`//`
5			`//==========================================================================`
6			`//####BSDCOPYRIGHTBEGIN####`
7			`//`
8			`// -------------------------------------------`
9			`//`
10			`// Portions of this software may have been derived from OpenBSD,`
11			`// FreeBSD or other sources, and are covered by the appropriate`
12			`// copyright disclaimers included herein.`
13			`//`
14			`// Portions created by Red Hat are`
15			`// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.`
16			`//`
17			`// -------------------------------------------`
18			`//`
19			`//####BSDCOPYRIGHTEND####`
20			`//==========================================================================`
21
22			`/*`
23			`* Copyright (c) 1982, 1986, 1991, 1993, 1995`
24			`* The Regents of the University of California. All rights reserved.`
25			`*`
26			`* Redistribution and use in source and binary forms, with or without`
27			`* modification, are permitted provided that the following conditions`
28			`* are met:`
29			`* 1. Redistributions of source code must retain the above copyright`
30			`* notice, this list of conditions and the following disclaimer.`
31			`* 2. Redistributions in binary form must reproduce the above copyright`
32			`* notice, this list of conditions and the following disclaimer in the`
33			`* documentation and/or other materials provided with the distribution.`
34			`* 3. All advertising materials mentioning features or use of this software`
35			`* must display the following acknowledgement:`
36			`* This product includes software developed by the University of`
37			`* California, Berkeley and its contributors.`
38			`* 4. Neither the name of the University nor the names of its contributors`
39			`* may be used to endorse or promote products derived from this software`
40			`* without specific prior written permission.`