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//==========================================================================
//
//      sys/netinet/in.c
//
//     
//
//==========================================================================
//####BSDCOPYRIGHTBEGIN####
//
// -------------------------------------------
//
// Portions of this software may have been derived from OpenBSD or other sources,
// and are covered by the appropriate copyright disclaimers included herein.
//
// -------------------------------------------
//
//####BSDCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    gthomas
// Contributors: gthomas
// Date:         2000-01-10
// Purpose:      
// Description:  
//              
//
//####DESCRIPTIONEND####
//
//==========================================================================
 
 
/*      $OpenBSD: in.c,v 1.14 1999/12/08 06:50:19 itojun Exp $  */
/*      $NetBSD: in.c,v 1.26 1996/02/13 23:41:39 christos Exp $ */
 
/*
 * Copyright (c) 1982, 1986, 1991, 1993
 *      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.c        8.2 (Berkeley) 11/15/93
 */
 
#ifdef __ECOS
#include <pkgconf/net.h>
#else
#include "ether.h"
#include "gif.h"
#endif
 
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#ifndef __ECOS
#include <sys/systm.h>
#endif
 
#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>
#if NGIF > 0
#include <net/if_gif.h>
#endif
 
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#include <netinet/igmp_var.h>
 
#ifdef MROUTING
#include <netinet/ip_mroute.h>
#endif
 
#ifdef INET
 
static int in_mask2len __P((struct in_addr *));
static void in_len2mask __P((struct in_addr *, int));
static int in_lifaddr_ioctl __P((struct socket *, u_long, caddr_t,
        struct ifnet *));
 
#ifndef SUBNETSARELOCAL
#define SUBNETSARELOCAL 0
#endif
int subnetsarelocal = SUBNETSARELOCAL;
/*
 * Return 1 if an internet address is for a ``local'' host
 * (one to which we have a connection).  If subnetsarelocal
 * is true, this includes other subnets of the local net.
 * Otherwise, it includes only the directly-connected (sub)nets.
 */
int
in_localaddr(in)
        struct in_addr in;
{
        register struct in_ifaddr *ia;
 
        if (subnetsarelocal) {
                for (ia = in_ifaddr.tqh_first; ia != 0; ia = ia->ia_list.tqe_next)
                        if ((in.s_addr & ia->ia_netmask) == ia->ia_net)
                                return (1);
        } else {
                for (ia = in_ifaddr.tqh_first; ia != 0; ia = ia->ia_list.tqe_next)
                        if ((in.s_addr & ia->ia_subnetmask) == ia->ia_subnet)
                                return (1);
        }
        return (0);
}
 
/*
 * Determine whether an IP address is in a reserved set of addresses
 * that may not be forwarded, or whether datagrams to that destination
 * may be forwarded.
 */
int
in_canforward(in)
        struct in_addr in;
{
        register u_int32_t net;
 
        if (IN_EXPERIMENTAL(in.s_addr) || IN_MULTICAST(in.s_addr))
                return (0);
        if (IN_CLASSA(in.s_addr)) {
                net = in.s_addr & IN_CLASSA_NET;
                if (net == 0 || net == htonl(IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
                        return (0);
        }
        return (1);
}
 
/*
 * Trim a mask in a sockaddr
 */
void
in_socktrim(ap)
        struct sockaddr_in *ap;
{
        register char *cplim = (char *) &ap->sin_addr;
        register char *cp = (char *) (&ap->sin_addr + 1);
 
        ap->sin_len = 0;
        while (--cp >= cplim)
                if (*cp) {
                        (ap)->sin_len = cp - (char *) (ap) + 1;
                        break;
                }
}
 
static int
in_mask2len(mask)
        struct in_addr *mask;
{
        int x, y;
        u_char *p;
 
        p = (u_char *)mask;
        for (x = 0; x < sizeof(*mask); x++) {
                if (p[x] != 0xff)
                        break;
        }
        y = 0;
        if (x < sizeof(*mask)) {
                for (y = 0; y < 8; y++) {
                        if ((p[x] & (0x80 >> y)) == 0)
                                break;
                }
        }
        return x * 8 + y;
}
 
static void
in_len2mask(mask, len)
        struct in_addr *mask;
        int len;
{
        int i;
        u_char *p;
 
        p = (u_char *)mask;
        bzero(mask, sizeof(*mask));
        for (i = 0; i < len / 8; i++)
                p[i] = 0xff;
        if (len % 8)
                p[i] = (0xff00 >> (len % 8)) & 0xff;
}
 
int     in_interfaces;          /* number of external internet interfaces */
 
/*
 * Generic internet control operations (ioctl's).
 * Ifp is 0 if not an interface-specific ioctl.
 */
/* ARGSUSED */
int
in_control(so, cmd, data, ifp)
        struct socket *so;
        u_long cmd;
        caddr_t data;
        register struct ifnet *ifp;
{
        register struct ifreq *ifr = (struct ifreq *)data;
        register struct in_ifaddr *ia = 0;
        struct in_aliasreq *ifra = (struct in_aliasreq *)data;
        struct sockaddr_in oldaddr;
        int error, hostIsNew, maskIsNew;
 
#if NGIF > 0
        if (ifp && ifp->if_type == IFT_GIF) {
                switch (cmd) {
                case SIOCSIFPHYADDR:
                        if ((so->so_state & SS_PRIV) == 0)
                                return(EPERM);
                case SIOCGIFPSRCADDR:
                case SIOCGIFPDSTADDR:
                        return gif_ioctl(ifp, cmd, data);
                }
        }
#endif
 
        switch (cmd) {
        case SIOCALIFADDR:
        case SIOCDLIFADDR:
                if ((so->so_state & SS_PRIV) == 0)
                        return(EPERM);
                /*fall through*/
        case SIOCGLIFADDR:
                if (!ifp)
                        return EINVAL;
                return in_lifaddr_ioctl(so, cmd, data, ifp);
        }
 
        /*
         * Find address for this interface, if it exists.
         */
        if (ifp)
                for (ia = in_ifaddr.tqh_first; ia; ia = ia->ia_list.tqe_next)
                        if (ia->ia_ifp == ifp)
                                break;
 
        switch (cmd) {
 
        case SIOCAIFADDR:
        case SIOCDIFADDR:
 
        case SIOCSIFADDR: // Moved from after this search, otherwise repeated
            // identical SIOCSIFADDRs leaked the previously allocated record.
 
                if (ifra->ifra_addr.sin_family == AF_INET)
                    for (; ia != 0; ia = ia->ia_list.tqe_next) {
                        if (ia->ia_ifp == ifp  &&
                            ia->ia_addr.sin_addr.s_addr ==
                                ifra->ifra_addr.sin_addr.s_addr)
                            break;
                }
                if (cmd == SIOCDIFADDR && ia == 0)
                        return (EADDRNOTAVAIL);
                /* FALLTHROUGH */
        case SIOCSIFNETMASK:
        case SIOCSIFDSTADDR:
                if ((so->so_state & SS_PRIV) == 0)
                        return (EPERM);
 
                if (ifp == 0)
                        panic("in_control");
                if (ia == (struct in_ifaddr *)0) {
                        ia = (struct in_ifaddr *)
                                malloc(sizeof *ia, M_IFADDR, M_WAITOK); // This alloc was leaked
                        if (ia == (struct in_ifaddr *)0)
                                return (ENOBUFS);
                        bzero((caddr_t)ia, sizeof *ia);
                        TAILQ_INSERT_TAIL(&in_ifaddr, ia, ia_list);
                        TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia,
                            ifa_list);
                        ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr);
                        ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr);
                        ia->ia_ifa.ifa_netmask = sintosa(&ia->ia_sockmask);
                        ia->ia_sockmask.sin_len = 8;
                        if (ifp->if_flags & IFF_BROADCAST) {
                                ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
                                ia->ia_broadaddr.sin_family = AF_INET;
                        }
                        ia->ia_ifp = ifp;
                        LIST_INIT(&ia->ia_multiaddrs);
                        if ((ifp->if_flags & IFF_LOOPBACK) == 0)
                                in_interfaces++;
                }
                break;
 
        case SIOCSIFBRDADDR:
                if ((so->so_state & SS_PRIV) == 0)
                        return (EPERM);
                /* FALLTHROUGH */
 
        case SIOCGIFADDR:
        case SIOCGIFNETMASK:
        case SIOCGIFDSTADDR:
        case SIOCGIFBRDADDR:
                if (ia && satosin(&ifr->ifr_addr)->sin_addr.s_addr) {
                        struct in_ifaddr *ia2;
 
                        for (ia2 = ia; ia2; ia2 = ia2->ia_list.tqe_next) {
                                if (ia2->ia_ifp == ifp &&
                                    ia2->ia_addr.sin_addr.s_addr ==
                                    satosin(&ifr->ifr_addr)->sin_addr.s_addr)
                                        break;
                        }
                        if (ia2 && ia2->ia_ifp == ifp)
                                ia = ia2;
                }
                if (ia == (struct in_ifaddr *)0)
                        return (EADDRNOTAVAIL);
                break;
        }
        switch (cmd) {
 
        case SIOCGIFADDR:
                *satosin(&ifr->ifr_addr) = ia->ia_addr;
                break;
 
        case SIOCGIFBRDADDR:
                if ((ifp->if_flags & IFF_BROADCAST) == 0)
                        return (EINVAL);
                *satosin(&ifr->ifr_dstaddr) = ia->ia_broadaddr;
                break;
 
        case SIOCGIFDSTADDR:
                if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
                        return (EINVAL);
                *satosin(&ifr->ifr_dstaddr) = ia->ia_dstaddr;
                break;
 
        case SIOCGIFNETMASK:
                *satosin(&ifr->ifr_addr) = ia->ia_sockmask;
                break;
 
        case SIOCSIFDSTADDR:
                if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
                        return (EINVAL);
                oldaddr = ia->ia_dstaddr;
                ia->ia_dstaddr = *satosin(&ifr->ifr_dstaddr);
                if (ifp->if_ioctl && (error = (*ifp->if_ioctl)
                                        (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) {
                        ia->ia_dstaddr = oldaddr;
                        return (error);
                }
                if (ia->ia_flags & IFA_ROUTE) {
                        ia->ia_ifa.ifa_dstaddr = sintosa(&oldaddr);
                        rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
                        ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr);
                        rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
                }
                break;
 
        case SIOCSIFBRDADDR:
                if ((ifp->if_flags & IFF_BROADCAST) == 0)
                        return (EINVAL);
                ia->ia_broadaddr = *satosin(&ifr->ifr_broadaddr);
                break;
 
        case SIOCSIFADDR:
                return (in_ifinit(ifp, ia, satosin(&ifr->ifr_addr), 1));
 
        case SIOCSIFNETMASK:
                ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr =
                    ifra->ifra_addr.sin_addr.s_addr;
                break;
 
        case SIOCAIFADDR:
                maskIsNew = 0;
                hostIsNew = 1;
                error = 0;
                if (ia->ia_addr.sin_family == AF_INET) {
                        if (ifra->ifra_addr.sin_len == 0) {
                                ifra->ifra_addr = ia->ia_addr;
                                hostIsNew = 0;
                        } else if (ifra->ifra_addr.sin_addr.s_addr ==
                                               ia->ia_addr.sin_addr.s_addr)
                                hostIsNew = 0;
                }
                if (ifra->ifra_mask.sin_len) {
                        in_ifscrub(ifp, ia);
                        ia->ia_sockmask = ifra->ifra_mask;
                        ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr;
                        maskIsNew = 1;
                }
                if ((ifp->if_flags & IFF_POINTOPOINT) &&
                    (ifra->ifra_dstaddr.sin_family == AF_INET)) {
                        in_ifscrub(ifp, ia);
                        ia->ia_dstaddr = ifra->ifra_dstaddr;
                        maskIsNew  = 1; /* We lie; but the effect's the same */
                }
                if (ifra->ifra_addr.sin_family == AF_INET &&
                    (hostIsNew || maskIsNew))
                        error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
                if ((ifp->if_flags & IFF_BROADCAST) &&
                    (ifra->ifra_broadaddr.sin_family == AF_INET))
                        ia->ia_broadaddr = ifra->ifra_broadaddr;
                return (error);
 
        case SIOCDIFADDR:
                in_ifscrub(ifp, ia);
                TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list);
                TAILQ_REMOVE(&in_ifaddr, ia, ia_list);
                IFAFREE((&ia->ia_ifa));
                break;
 
#ifdef MROUTING
        case SIOCGETVIFCNT:
        case SIOCGETSGCNT:
                return (mrt_ioctl(cmd, data));
#endif /* MROUTING */
 
        default:
                if (ifp == 0 || ifp->if_ioctl == 0)
                        return (EOPNOTSUPP);
                return ((*ifp->if_ioctl)(ifp, cmd, data));
        }
        return (0);
}
 
/*
 * SIOC[GAD]LIFADDR.
 *      SIOCGLIFADDR: get first address. ( ??? )
 *      SIOCGLIFADDR with IFLR_PREFIX:
 *              get first address that matches the specified prefix.
 *      SIOCALIFADDR: add the specified address.
 *      SIOCALIFADDR with IFLR_PREFIX:
 *              EINVAL since we can't deduce hostid part of the address.
 *      SIOCDLIFADDR: delete the specified address.
 *      SIOCDLIFADDR with IFLR_PREFIX:
 *              delete the first address that matches the specified prefix.
 * return values:
 *      EINVAL on invalid parameters
 *      EADDRNOTAVAIL on prefix match failed/specified address not found
 *      other values may be returned from in_ioctl()
 */
static int
in_lifaddr_ioctl(so, cmd, data, ifp)
        struct socket *so;
        u_long cmd;
        caddr_t data;
        struct ifnet *ifp;
{
        struct if_laddrreq *iflr = (struct if_laddrreq *)data;
        struct ifaddr *ifa;
        struct sockaddr *sa;
 
        /* sanity checks */
        if (!data || !ifp) {
                panic("invalid argument to in_lifaddr_ioctl");
                /*NOTRECHED*/
        }
 
        switch (cmd) {
        case SIOCGLIFADDR:
                /* address must be specified on GET with IFLR_PREFIX */
                if ((iflr->flags & IFLR_PREFIX) == 0)
                        break;
                /*FALLTHROUGH*/
        case SIOCALIFADDR:
        case SIOCDLIFADDR:
                /* address must be specified on ADD and DELETE */
                sa = (struct sockaddr *)&iflr->addr;
                if (sa->sa_family != AF_INET)
                        return EINVAL;
                if (sa->sa_len != sizeof(struct sockaddr_in))
                        return EINVAL;
                /* XXX need improvement */
                sa = (struct sockaddr *)&iflr->dstaddr;
                if (sa->sa_family
                 && sa->sa_family != AF_INET)
                        return EINVAL;
                if (sa->sa_len && sa->sa_len != sizeof(struct sockaddr_in))
                        return EINVAL;
                break;
        default: /*shouldn't happen*/
#if 0
                panic("invalid cmd to in_lifaddr_ioctl");
                /*NOTREACHED*/
#else
                return EOPNOTSUPP;
#endif
        }
        if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
                return EINVAL;
 
        switch (cmd) {
        case SIOCALIFADDR:
            {
                struct in_aliasreq ifra;
 
                if (iflr->flags & IFLR_PREFIX)
                        return EINVAL;
 
                /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
                bzero(&ifra, sizeof(ifra));
                bcopy(iflr->iflr_name, ifra.ifra_name,
                        sizeof(ifra.ifra_name));
 
                bcopy(&iflr->addr, &ifra.ifra_addr,
                        ((struct sockaddr *)&iflr->addr)->sa_len);
 
                if (((struct sockaddr *)&iflr->dstaddr)->sa_family) {   /*XXX*/
                        bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
                                ((struct sockaddr *)&iflr->dstaddr)->sa_len);
                }
 
                ifra.ifra_mask.sin_family = AF_INET;
                ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
                in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
 
                return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp);
            }
        case SIOCGLIFADDR:
        case SIOCDLIFADDR:
            {
                struct in_ifaddr *ia;
                struct in_addr mask, candidate, match;
                struct sockaddr_in *sin;
                int cmp;
 
                bzero(&mask, sizeof(mask));
                if (iflr->flags & IFLR_PREFIX) {
                        /* lookup a prefix rather than address. */
                        in_len2mask(&mask, iflr->prefixlen);
 
                        sin = (struct sockaddr_in *)&iflr->addr;
                        match.s_addr = sin->sin_addr.s_addr;
                        match.s_addr &= mask.s_addr;
 
                        /* if you set extra bits, that's wrong */
                        if (match.s_addr != sin->sin_addr.s_addr)
                                return EINVAL;
 
                        cmp = 1;
                } else {
                        if (cmd == SIOCGLIFADDR) {
                                /* on getting an address, take the 1st match */
                                cmp = 0; /*XXX*/
                        } else {
                                /* on deleting an address, do exact match */
                                in_len2mask(&mask, 32);
                                sin = (struct sockaddr_in *)&iflr->addr;
                                match.s_addr = sin->sin_addr.s_addr;
 
                                cmp = 1;
                        }
                }
 
                for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = ifa->ifa_list.tqe_next) {
                        if (ifa->ifa_addr->sa_family != AF_INET6)
                                continue;
                        if (!cmp)
                                break;
                        candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
                        candidate.s_addr &= mask.s_addr;
                        if (candidate.s_addr == match.s_addr)
                                break;
                }
                if (!ifa)
                        return EADDRNOTAVAIL;
                ia = (struct in_ifaddr *)ifa;
 
                if (cmd == SIOCGLIFADDR) {
                        /* fill in the if_laddrreq structure */
                        bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
 
                        if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
                                bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
                                        ia->ia_dstaddr.sin_len);
                        } else
                                bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
 
                        iflr->prefixlen =
                                in_mask2len(&ia->ia_sockmask.sin_addr);
 
                        iflr->flags = 0; /*XXX*/
 
                        return 0;
                } else {
                        struct in_aliasreq ifra;
 
                        /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
                        bzero(&ifra, sizeof(ifra));
                        bcopy(iflr->iflr_name, ifra.ifra_name,
                                sizeof(ifra.ifra_name));
 
                        bcopy(&ia->ia_addr, &ifra.ifra_addr,
                                ia->ia_addr.sin_len);
                        if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
                                bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
                                        ia->ia_dstaddr.sin_len);
                        }
                        bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
                                ia->ia_sockmask.sin_len);
 
                        return in_control(so, SIOCDIFADDR, (caddr_t)&ifra, ifp);
                }
            }
        }
 
        return EOPNOTSUPP;      /*just for safety*/
}
 
/*
 * Delete any existing route for an interface.
 */
void
in_ifscrub(ifp, ia)
        register struct ifnet *ifp;
        register struct in_ifaddr *ia;
{
 
        if ((ia->ia_flags & IFA_ROUTE) == 0)
                return;
        if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
                rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
        else
                rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
        ia->ia_flags &= ~IFA_ROUTE;
}
 
/*
 * Initialize an interface's internet address
 * and routing table entry.
 */
int
in_ifinit(ifp, ia, sin, scrub)
        register struct ifnet *ifp;
        register struct in_ifaddr *ia;
        struct sockaddr_in *sin;
        int scrub;
{
        register u_int32_t i = sin->sin_addr.s_addr;
        struct sockaddr_in oldaddr;
        int s = splimp(), flags = RTF_UP, error;
 
        oldaddr = ia->ia_addr;
        ia->ia_addr = *sin;
        /*
         * Give the interface a chance to initialize
         * if this is its first address,
         * and to validate the address if necessary.
         */
        if (ifp->if_ioctl &&
            (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
                splx(s);
                ia->ia_addr = oldaddr;
                return (error);
        }
        splx(s);
        if (scrub) {
                ia->ia_ifa.ifa_addr = sintosa(&oldaddr);
                in_ifscrub(ifp, ia);
                ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr);
        }
        if (IN_CLASSA(i))
                ia->ia_netmask = IN_CLASSA_NET;
        else if (IN_CLASSB(i))
                ia->ia_netmask = IN_CLASSB_NET;
        else
                ia->ia_netmask = IN_CLASSC_NET;
        /*
         * The subnet mask usually includes at least the standard network part,
         * but may may be smaller in the case of supernetting.
         * If it is set, we believe it.
         */
        if (ia->ia_subnetmask == 0) {
                ia->ia_subnetmask = ia->ia_netmask;
                ia->ia_sockmask.sin_addr.s_addr = ia->ia_subnetmask;
        } else
                ia->ia_netmask &= ia->ia_subnetmask;
        ia->ia_net = i & ia->ia_netmask;
        ia->ia_subnet = i & ia->ia_subnetmask;
        in_socktrim(&ia->ia_sockmask);
        /*
         * Add route for the network.
         */
        ia->ia_ifa.ifa_metric = ifp->if_metric;
        if (ifp->if_flags & IFF_BROADCAST) {
                ia->ia_broadaddr.sin_addr.s_addr =
                        ia->ia_subnet | ~ia->ia_subnetmask;
                ia->ia_netbroadcast.s_addr =
                        ia->ia_net | ~ia->ia_netmask;
        } else if (ifp->if_flags & IFF_LOOPBACK) {
                ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
                flags |= RTF_HOST;
        } else if (ifp->if_flags & IFF_POINTOPOINT) {
                if (ia->ia_dstaddr.sin_family != AF_INET)
                        return (0);
                flags |= RTF_HOST;
        }
        if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0)
                ia->ia_flags |= IFA_ROUTE;
        /*
         * If the interface supports multicast, join the "all hosts"
         * multicast group on that interface.
         */
        if (ifp->if_flags & IFF_MULTICAST) {
                struct in_addr addr;
 
                addr.s_addr = INADDR_ALLHOSTS_GROUP;
                in_addmulti(&addr, ifp);
        }
        return (error);
}
 
 
/*
 * Return 1 if the address might be a local broadcast address.
 */
int
in_broadcast(in, ifp)
        struct in_addr in;
        struct ifnet *ifp;
{
        struct ifnet *ifn, *if_first, *if_target;
        register struct ifaddr *ifa;
 
        if (in.s_addr == INADDR_BROADCAST ||
            in.s_addr == INADDR_ANY)
                return 1;
        if (ifp && ((ifp->if_flags & IFF_BROADCAST) == 0))
                return 0;
 
        if (ifp == NULL)
        {
                if_first = ifnet.tqh_first;
                if_target = 0;
        }
        else
        {
                if_first = ifp;
                if_target = ifp->if_list.tqe_next;
        }
 
#define ia (ifatoia(ifa))
        /*
         * Look through the list of addresses for a match
         * with a broadcast address.
         * If ifp is NULL, check against all the interfaces.
         */
        for (ifn = if_first; ifn != if_target; ifn = ifn->if_list.tqe_next)
          for (ifa = ifn->if_addrlist.tqh_first; ifa;
               ifa = ifa->ifa_list.tqe_next)
              if (!ifp)
              {
                  if (ifa->ifa_addr->sa_family == AF_INET &&
                      ((ia->ia_subnetmask != 0xffffffff &&
                      (((ifn->if_flags & IFF_BROADCAST) &&
                        in.s_addr == ia->ia_broadaddr.sin_addr.s_addr) ||
                         in.s_addr == ia->ia_subnet)) ||
                       /*
                        * Check for old-style (host 0) broadcast.
                        */
                       (in.s_addr == ia->ia_netbroadcast.s_addr ||
                        in.s_addr == ia->ia_net)))
                              return 1;
              }
              else
                  if (ifa->ifa_addr->sa_family == AF_INET &&
                      (((ifn->if_flags & IFF_BROADCAST) &&
                      in.s_addr == ia->ia_broadaddr.sin_addr.s_addr) ||
                       in.s_addr == ia->ia_netbroadcast.s_addr ||
                       /*
                        * Check for old-style (host 0) broadcast.
                        */
                       in.s_addr == ia->ia_subnet ||
                       in.s_addr == ia->ia_net))
                              return 1;
        return (0);
#undef ia
}
 
/*
 * Add an address to the list of IP multicast addresses for a given interface.
 */
struct in_multi *
in_addmulti(ap, ifp)
        register struct in_addr *ap;
        register struct ifnet *ifp;
{
        register struct in_multi *inm;
        struct ifreq ifr;
        struct in_ifaddr *ia;
        int s = splsoftnet();
 
        /*
         * See if address already in list.
         */
        IN_LOOKUP_MULTI(*ap, ifp, inm);
        if (inm != NULL) {
                /*
                 * Found it; just increment the reference count.
                 */
                ++inm->inm_refcount;
        } else {
                /*
                 * New address; allocate a new multicast record
                 * and link it into the interface's multicast list.
                 */
                inm = (struct in_multi *)malloc(sizeof(*inm),
                    M_IPMADDR, M_NOWAIT);
                if (inm == NULL) {
                        splx(s);
                        return (NULL);
                }
                inm->inm_addr = *ap;
                inm->inm_ifp = ifp;
                inm->inm_refcount = 1;
                IFP_TO_IA(ifp, ia);
                if (ia == NULL) {
                        free(inm, M_IPMADDR);
                        splx(s);
                        return (NULL);
                }
                inm->inm_ia = ia;
                LIST_INSERT_HEAD(&ia->ia_multiaddrs, inm, inm_list);
                /*
                 * Ask the network driver to update its multicast reception
                 * filter appropriately for the new address.
                 */
                satosin(&ifr.ifr_addr)->sin_len = sizeof(struct sockaddr_in);
                satosin(&ifr.ifr_addr)->sin_family = AF_INET;
                satosin(&ifr.ifr_addr)->sin_addr = *ap;
                if ((ifp->if_ioctl == NULL) ||
                    (*ifp->if_ioctl)(ifp, SIOCADDMULTI,(caddr_t)&ifr) != 0) {
                        LIST_REMOVE(inm, inm_list);
                        free(inm, M_IPMADDR);
                        splx(s);
                        return (NULL);
                }
                /*
                 * Let IGMP know that we have joined a new IP multicast group.
                 */
                igmp_joingroup(inm);
        }
        splx(s);
        return (inm);
}
 
/*
 * Delete a multicast address record.
 */
void
in_delmulti(inm)
        register struct in_multi *inm;
{
        struct ifreq ifr;
        int s = splsoftnet();
 
        if (--inm->inm_refcount == 0) {
                /*
                 * No remaining claims to this record; let IGMP know that
                 * we are leaving the multicast group.
                 */
                igmp_leavegroup(inm);
                /*
                 * Unlink from list.
                 */
                LIST_REMOVE(inm, inm_list);
                /*
                 * Notify the network driver to update its multicast reception
                 * filter.
                 */
                satosin(&ifr.ifr_addr)->sin_family = AF_INET;
                satosin(&ifr.ifr_addr)->sin_addr = inm->inm_addr;
                (*inm->inm_ifp->if_ioctl)(inm->inm_ifp, SIOCDELMULTI,
                                                             (caddr_t)&ifr);
                free(inm, M_IPMADDR);
        }
        splx(s);
}
 
#endif
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Line No.	Rev	Author	Line
1	27	unneback	`//==========================================================================`
2			`//`
3			`// sys/netinet/in.c`
4			`//`
5			`//`
6			`//`
7			`//==========================================================================`
8			`//####BSDCOPYRIGHTBEGIN####`
9			`//`
10			`// -------------------------------------------`
11			`//`
12			`// Portions of this software may have been derived from OpenBSD or other sources,`
13			`// and are covered by the appropriate copyright disclaimers included herein.`
14			`//`
15			`// -------------------------------------------`
16			`//`
17			`//####BSDCOPYRIGHTEND####`
18			`//==========================================================================`
19			`//#####DESCRIPTIONBEGIN####`
20			`//`
21			`// Author(s): gthomas`
22			`// Contributors: gthomas`
23			`// Date: 2000-01-10`
24			`// Purpose:`
25			`// Description:`
26			`//`
27			`//`
28			`//####DESCRIPTIONEND####`
29			`//`
30			`//==========================================================================`
31
32
33			`/* $OpenBSD: in.c,v 1.14 1999/12/08 06:50:19 itojun Exp $ */`
34			`/* $NetBSD: in.c,v 1.26 1996/02/13 23:41:39 christos Exp $ */`
35
36			`/*`
37			`* Copyright (c) 1982, 1986, 1991, 1993`
38			`* The Regents of the University of California. All rights reserved.`
39			`*`
40			`* Redistribution and use in source and binary forms, with or without`