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Annotation of XNU/bsd/netns/ns.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1984, 1985, 1986, 1987, 1993
        !            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.
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            43:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            44:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            45:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            46:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            47:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            48:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            49:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            50:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            51:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            52:  * SUCH DAMAGE.
        !            53:  *
        !            54:  *     @(#)ns.c        8.2 (Berkeley) 11/15/93
        !            55:  */
        !            56: 
        !            57: #include <sys/param.h>
        !            58: #include <sys/mbuf.h>
        !            59: #include <sys/ioctl.h>
        !            60: #include <sys/protosw.h>
        !            61: #include <sys/errno.h>
        !            62: #include <sys/socket.h>
        !            63: #include <sys/socketvar.h>
        !            64: 
        !            65: #include <net/if.h>
        !            66: #include <net/route.h>
        !            67: 
        !            68: #include <netns/ns.h>
        !            69: #include <netns/ns_if.h>
        !            70: 
        !            71: #ifdef NS
        !            72: 
        !            73: struct ns_ifaddr *ns_ifaddr;
        !            74: int ns_interfaces;
        !            75: extern struct sockaddr_ns ns_netmask, ns_hostmask;
        !            76: 
        !            77: /*
        !            78:  * Generic internet control operations (ioctl's).
        !            79:  */
        !            80: /* ARGSUSED */
        !            81: ns_control(so, cmd, data, ifp)
        !            82:        struct socket *so;
        !            83:        int cmd;
        !            84:        caddr_t data;
        !            85:        register struct ifnet *ifp;
        !            86: {
        !            87:        register struct ifreq *ifr = (struct ifreq *)data;
        !            88:        register struct ns_aliasreq *ifra = (struct ns_aliasreq *)data;
        !            89:        register struct ns_ifaddr *ia;
        !            90:        struct ifaddr *ifa;
        !            91:        struct ns_ifaddr *oia;
        !            92:        int error, dstIsNew, hostIsNew;
        !            93: 
        !            94:        /*
        !            95:         * Find address for this interface, if it exists.
        !            96:         */
        !            97:        if (ifp == 0)
        !            98:                return (EADDRNOTAVAIL);
        !            99:        for (ia = ns_ifaddr; ia; ia = ia->ia_next)
        !           100:                if (ia->ia_ifp == ifp)
        !           101:                        break;
        !           102: 
        !           103:        switch (cmd) {
        !           104: 
        !           105:        case SIOCGIFADDR:
        !           106:                if (ia == (struct ns_ifaddr *)0)
        !           107:                        return (EADDRNOTAVAIL);
        !           108:                *(struct sockaddr_ns *)&ifr->ifr_addr = ia->ia_addr;
        !           109:                return (0);
        !           110: 
        !           111: 
        !           112:        case SIOCGIFBRDADDR:
        !           113:                if (ia == (struct ns_ifaddr *)0)
        !           114:                        return (EADDRNOTAVAIL);
        !           115:                if ((ifp->if_flags & IFF_BROADCAST) == 0)
        !           116:                        return (EINVAL);
        !           117:                *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_broadaddr;
        !           118:                return (0);
        !           119: 
        !           120:        case SIOCGIFDSTADDR:
        !           121:                if (ia == (struct ns_ifaddr *)0)
        !           122:                        return (EADDRNOTAVAIL);
        !           123:                if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
        !           124:                        return (EINVAL);
        !           125:                *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_dstaddr;
        !           126:                return (0);
        !           127:        }
        !           128: 
        !           129:        if ((so->so_state & SS_PRIV) == 0)
        !           130:                return (EPERM);
        !           131: 
        !           132:        switch (cmd) {
        !           133:        case SIOCAIFADDR:
        !           134:        case SIOCDIFADDR:
        !           135:                if (ifra->ifra_addr.sns_family == AF_NS)
        !           136:                    for (oia = ia; ia; ia = ia->ia_next) {
        !           137:                        if (ia->ia_ifp == ifp  &&
        !           138:                            ns_neteq(ia->ia_addr.sns_addr,
        !           139:                                  ifra->ifra_addr.sns_addr))
        !           140:                            break;
        !           141:                    }
        !           142:                if (cmd == SIOCDIFADDR && ia == 0)
        !           143:                        return (EADDRNOTAVAIL);
        !           144:                /* FALLTHROUGH */
        !           145: 
        !           146:        case SIOCSIFADDR:
        !           147:        case SIOCSIFDSTADDR:
        !           148:                if (ia == (struct ns_ifaddr *)0) {
        !           149: //                     oia = (struct ns_ifaddr *)
        !           150: //                             malloc(sizeof *ia, M_IFADDR, M_WAITOK);
        !           151:                        MALLOC(oia, struct ns_ifaddr *, sizeof *ia, M_IFADDR, M_WAITOK);
        !           152:                        if (oia == (struct ns_ifaddr *)NULL)
        !           153:                                return (ENOBUFS);
        !           154:                        bzero((caddr_t)oia, sizeof(*oia));
        !           155:                        if (ia = ns_ifaddr) {
        !           156:                                for ( ; ia->ia_next; ia = ia->ia_next)
        !           157:                                        ;
        !           158:                                ia->ia_next = oia;
        !           159:                        } else
        !           160:                                ns_ifaddr = oia;
        !           161:                        ia = oia;
        !           162:                        if (ifa = ifp->if_addrlist) {
        !           163:                                for ( ; ifa->ifa_next; ifa = ifa->ifa_next)
        !           164:                                        ;
        !           165:                                ifa->ifa_next = (struct ifaddr *) ia;
        !           166:                        } else
        !           167:                                ifp->if_addrlist = (struct ifaddr *) ia;
        !           168:                        ia->ia_ifp = ifp;
        !           169:                        ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
        !           170: 
        !           171:                        ia->ia_ifa.ifa_netmask =
        !           172:                                (struct sockaddr *)&ns_netmask;
        !           173: 
        !           174:                        ia->ia_ifa.ifa_dstaddr =
        !           175:                                (struct sockaddr *)&ia->ia_dstaddr;
        !           176:                        if (ifp->if_flags & IFF_BROADCAST) {
        !           177:                                ia->ia_broadaddr.sns_family = AF_NS;
        !           178:                                ia->ia_broadaddr.sns_len = sizeof(ia->ia_addr);
        !           179:                                ia->ia_broadaddr.sns_addr.x_host = ns_broadhost;
        !           180:                        }
        !           181:                        ns_interfaces++;
        !           182:                }
        !           183:        }
        !           184: 
        !           185:        switch (cmd) {
        !           186:                int error;
        !           187: 
        !           188:        case SIOCSIFDSTADDR:
        !           189:                if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
        !           190:                        return (EINVAL);
        !           191:                if (ia->ia_flags & IFA_ROUTE) {
        !           192:                        rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
        !           193:                        ia->ia_flags &= ~IFA_ROUTE;
        !           194:                }
        !           195:                if (ifp->if_ioctl) {
        !           196:                        error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, ia);
        !           197:                        if (error)
        !           198:                                return (error);
        !           199:                }
        !           200:                *(struct sockaddr *)&ia->ia_dstaddr = ifr->ifr_dstaddr;
        !           201:                return (0);
        !           202: 
        !           203:        case SIOCSIFADDR:
        !           204:                return (ns_ifinit(ifp, ia,
        !           205:                                (struct sockaddr_ns *)&ifr->ifr_addr, 1));
        !           206: 
        !           207:        case SIOCDIFADDR:
        !           208:                ns_ifscrub(ifp, ia);
        !           209:                if ((ifa = ifp->if_addrlist) == (struct ifaddr *)ia)
        !           210:                        ifp->if_addrlist = ifa->ifa_next;
        !           211:                else {
        !           212:                        while (ifa->ifa_next &&
        !           213:                               (ifa->ifa_next != (struct ifaddr *)ia))
        !           214:                                    ifa = ifa->ifa_next;
        !           215:                        if (ifa->ifa_next)
        !           216:                            ifa->ifa_next = ((struct ifaddr *)ia)->ifa_next;
        !           217:                        else
        !           218:                                printf("Couldn't unlink nsifaddr from ifp\n");
        !           219:                }
        !           220:                oia = ia;
        !           221:                if (oia == (ia = ns_ifaddr)) {
        !           222:                        ns_ifaddr = ia->ia_next;
        !           223:                } else {
        !           224:                        while (ia->ia_next && (ia->ia_next != oia)) {
        !           225:                                ia = ia->ia_next;
        !           226:                        }
        !           227:                        if (ia->ia_next)
        !           228:                            ia->ia_next = oia->ia_next;
        !           229:                        else
        !           230:                                printf("Didn't unlink nsifadr from list\n");
        !           231:                }
        !           232:                IFAFREE((&oia->ia_ifa));
        !           233:                if (0 == --ns_interfaces) {
        !           234:                        /*
        !           235:                         * We reset to virginity and start all over again
        !           236:                         */
        !           237:                        ns_thishost = ns_zerohost;
        !           238:                }
        !           239:                return (0);
        !           240:        
        !           241:        case SIOCAIFADDR:
        !           242:                dstIsNew = 0; hostIsNew = 1;
        !           243:                if (ia->ia_addr.sns_family == AF_NS) {
        !           244:                        if (ifra->ifra_addr.sns_len == 0) {
        !           245:                                ifra->ifra_addr = ia->ia_addr;
        !           246:                                hostIsNew = 0;
        !           247:                        } else if (ns_neteq(ifra->ifra_addr.sns_addr,
        !           248:                                         ia->ia_addr.sns_addr))
        !           249:                                hostIsNew = 0;
        !           250:                }
        !           251:                if ((ifp->if_flags & IFF_POINTOPOINT) &&
        !           252:                    (ifra->ifra_dstaddr.sns_family == AF_NS)) {
        !           253:                        if (hostIsNew == 0)
        !           254:                                ns_ifscrub(ifp, ia);
        !           255:                        ia->ia_dstaddr = ifra->ifra_dstaddr;
        !           256:                        dstIsNew  = 1;
        !           257:                }
        !           258:                if (ifra->ifra_addr.sns_family == AF_NS &&
        !           259:                                            (hostIsNew || dstIsNew))
        !           260:                        error = ns_ifinit(ifp, ia, &ifra->ifra_addr, 0);
        !           261:                return (error);
        !           262: 
        !           263:        default:
        !           264:                if (ifp->if_ioctl == 0)
        !           265:                        return (EOPNOTSUPP);
        !           266:                return ((*ifp->if_ioctl)(ifp, cmd, data));
        !           267:        }
        !           268: }
        !           269: 
        !           270: /*
        !           271: * Delete any previous route for an old address.
        !           272: */
        !           273: ns_ifscrub(ifp, ia)
        !           274:        register struct ifnet *ifp;
        !           275:        register struct ns_ifaddr *ia; 
        !           276: {
        !           277:        if (ia->ia_flags & IFA_ROUTE) {
        !           278:                if (ifp->if_flags & IFF_POINTOPOINT) {
        !           279:                        rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
        !           280:                } else
        !           281:                        rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
        !           282:                ia->ia_flags &= ~IFA_ROUTE;
        !           283:        }
        !           284: }
        !           285: /*
        !           286:  * Initialize an interface's internet address
        !           287:  * and routing table entry.
        !           288:  */
        !           289: ns_ifinit(ifp, ia, sns, scrub)
        !           290:        register struct ifnet *ifp;
        !           291:        register struct ns_ifaddr *ia;
        !           292:        register struct sockaddr_ns *sns;
        !           293: {
        !           294:        struct sockaddr_ns oldaddr;
        !           295:        register union ns_host *h = &ia->ia_addr.sns_addr.x_host;
        !           296:        int s = splimp(), error;
        !           297: 
        !           298:        /*
        !           299:         * Set up new addresses.
        !           300:         */
        !           301:        oldaddr = ia->ia_addr;
        !           302:        ia->ia_addr = *sns;
        !           303:        /*
        !           304:         * The convention we shall adopt for naming is that
        !           305:         * a supplied address of zero means that "we don't care".
        !           306:         * if there is a single interface, use the address of that
        !           307:         * interface as our 6 byte host address.
        !           308:         * if there are multiple interfaces, use any address already
        !           309:         * used.
        !           310:         *
        !           311:         * Give the interface a chance to initialize
        !           312:         * if this is its first address,
        !           313:         * and to validate the address if necessary.
        !           314:         */
        !           315:        if (ns_hosteqnh(ns_thishost, ns_zerohost)) {
        !           316:                if (ifp->if_ioctl &&
        !           317:                     (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, ia))) {
        !           318:                        ia->ia_addr = oldaddr;
        !           319:                        splx(s);
        !           320:                        return (error);
        !           321:                }
        !           322:                ns_thishost = *h;
        !           323:        } else if (ns_hosteqnh(sns->sns_addr.x_host, ns_zerohost)
        !           324:            || ns_hosteqnh(sns->sns_addr.x_host, ns_thishost)) {
        !           325:                *h = ns_thishost;
        !           326:                if (ifp->if_ioctl &&
        !           327:                     (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, ia))) {
        !           328:                        ia->ia_addr = oldaddr;
        !           329:                        splx(s);
        !           330:                        return (error);
        !           331:                }
        !           332:                if (!ns_hosteqnh(ns_thishost,*h)) {
        !           333:                        ia->ia_addr = oldaddr;
        !           334:                        splx(s);
        !           335:                        return (EINVAL);
        !           336:                }
        !           337:        } else {
        !           338:                ia->ia_addr = oldaddr;
        !           339:                splx(s);
        !           340:                return (EINVAL);
        !           341:        }
        !           342:        ia->ia_ifa.ifa_metric = ifp->if_metric;
        !           343:        /*
        !           344:         * Add route for the network.
        !           345:         */
        !           346:        if (scrub) {
        !           347:                ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
        !           348:                ns_ifscrub(ifp, ia);
        !           349:                ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
        !           350:        }
        !           351:        if (ifp->if_flags & IFF_POINTOPOINT)
        !           352:                rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
        !           353:        else {
        !           354:                ia->ia_broadaddr.sns_addr.x_net = ia->ia_addr.sns_addr.x_net;
        !           355:                rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP);
        !           356:        }
        !           357:        ia->ia_flags |= IFA_ROUTE;
        !           358:        return (0);
        !           359: }
        !           360: 
        !           361: /*
        !           362:  * Return address info for specified internet network.
        !           363:  */
        !           364: struct ns_ifaddr *
        !           365: ns_iaonnetof(dst)
        !           366:        register struct ns_addr *dst;
        !           367: {
        !           368:        register struct ns_ifaddr *ia;
        !           369:        register struct ns_addr *compare;
        !           370:        register struct ifnet *ifp;
        !           371:        struct ns_ifaddr *ia_maybe = 0;
        !           372:        union ns_net net = dst->x_net;
        !           373: 
        !           374:        for (ia = ns_ifaddr; ia; ia = ia->ia_next) {
        !           375:                if (ifp = ia->ia_ifp) {
        !           376:                        if (ifp->if_flags & IFF_POINTOPOINT) {
        !           377:                                compare = &satons_addr(ia->ia_dstaddr);
        !           378:                                if (ns_hosteq(*dst, *compare))
        !           379:                                        return (ia);
        !           380:                                if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
        !           381:                                        ia_maybe = ia;
        !           382:                        } else {
        !           383:                                if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
        !           384:                                        return (ia);
        !           385:                        }
        !           386:                }
        !           387:        }
        !           388:        return (ia_maybe);
        !           389: }
        !           390: #endif

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