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Annotation of XNU/bsd/netns/ns_ip.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_ip.c     8.1 (Berkeley) 6/10/93
        !            55:  */
        !            56: 
        !            57: /*
        !            58:  * Software interface driver for encapsulating ns in ip.
        !            59:  */
        !            60: 
        !            61: #ifdef NSIP
        !            62: #include <sys/param.h>
        !            63: #include <sys/systm.h>
        !            64: #include <sys/malloc.h>
        !            65: #include <sys/mbuf.h>
        !            66: #include <sys/socket.h>
        !            67: #include <sys/socketvar.h>
        !            68: #include <sys/errno.h>
        !            69: #include <sys/ioctl.h>
        !            70: #include <sys/protosw.h>
        !            71: 
        !            72: #include <net/if.h>
        !            73: #include <net/netisr.h>
        !            74: #include <net/route.h>
        !            75: 
        !            76: #include <netinet/in.h>
        !            77: #include <netinet/in_systm.h>
        !            78: #include <netinet/in_var.h>
        !            79: #include <netinet/ip.h>
        !            80: #include <netinet/ip_var.h>
        !            81: 
        !            82: #include <machine/mtpr.h>
        !            83: 
        !            84: #include <netns/ns.h>
        !            85: #include <netns/ns_if.h>
        !            86: #include <netns/idp.h>
        !            87: 
        !            88: struct ifnet_en {
        !            89:        struct ifnet ifen_ifnet;
        !            90:        struct route ifen_route;
        !            91:        struct in_addr ifen_src;
        !            92:        struct in_addr ifen_dst;
        !            93:        struct ifnet_en *ifen_next;
        !            94: };
        !            95: 
        !            96: int    nsipoutput(), nsipioctl(), nsipstart();
        !            97: #define LOMTU  (1024+512);
        !            98: 
        !            99: struct ifnet nsipif;
        !           100: struct ifnet_en *nsip_list;            /* list of all hosts and gateways or
        !           101:                                        broadcast addrs */
        !           102: 
        !           103: struct ifnet_en *
        !           104: nsipattach()
        !           105: {
        !           106:        register struct ifnet_en *m;
        !           107:        register struct ifnet *ifp;
        !           108: 
        !           109:        if (nsipif.if_mtu == 0) {
        !           110:                ifp = &nsipif;
        !           111:                ifp->if_name = "nsip";
        !           112:                ifp->if_mtu = LOMTU;
        !           113:                ifp->if_ioctl = nsipioctl;
        !           114:                ifp->if_output = nsipoutput;
        !           115:                ifp->if_start = nsipstart;
        !           116:                ifp->if_flags = IFF_POINTOPOINT;
        !           117:        }
        !           118: 
        !           119:        MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_NOWAIT);
        !           120:        if (m == NULL) return (NULL);
        !           121:        m->ifen_next = nsip_list;
        !           122:        nsip_list = m;
        !           123:        ifp = &m->ifen_ifnet;
        !           124: 
        !           125:        ifp->if_name = "nsip";
        !           126:        ifp->if_mtu = LOMTU;
        !           127:        ifp->if_ioctl = nsipioctl;
        !           128:        ifp->if_output = nsipoutput;
        !           129:        ifp->if_start = nsipstart;
        !           130:        ifp->if_flags = IFF_POINTOPOINT;
        !           131:        ifp->if_unit = nsipif.if_unit++;
        !           132:        if_attach(ifp);
        !           133: 
        !           134:        return (m);
        !           135: }
        !           136: 
        !           137: 
        !           138: /*
        !           139:  * Process an ioctl request.
        !           140:  */
        !           141: /* ARGSUSED */
        !           142: nsipioctl(ifp, cmd, data)
        !           143:        register struct ifnet *ifp;
        !           144:        int cmd;
        !           145:        caddr_t data;
        !           146: {
        !           147:        int error = 0;
        !           148:        struct ifreq *ifr;
        !           149: 
        !           150:        switch (cmd) {
        !           151: 
        !           152:        case SIOCSIFADDR:
        !           153:                ifp->if_flags |= IFF_UP;
        !           154:                /* fall into: */
        !           155: 
        !           156:        case SIOCSIFDSTADDR:
        !           157:                /*
        !           158:                 * Everything else is done at a higher level.
        !           159:                 */
        !           160:                break;
        !           161: 
        !           162:        case SIOCSIFFLAGS:
        !           163:                ifr = (struct ifreq *)data;
        !           164:                if ((ifr->ifr_flags & IFF_UP) == 0)
        !           165:                        error = nsip_free(ifp);
        !           166: 
        !           167: 
        !           168:        default:
        !           169:                error = EINVAL;
        !           170:        }
        !           171:        return (error);
        !           172: }
        !           173: 
        !           174: struct mbuf *nsip_badlen;
        !           175: struct mbuf *nsip_lastin;
        !           176: int nsip_hold_input;
        !           177: 
        !           178: idpip_input(m, ifp)
        !           179:        register struct mbuf *m;
        !           180:        struct ifnet *ifp;
        !           181: {
        !           182:        register struct ip *ip;
        !           183:        register struct idp *idp;
        !           184:        register struct ifqueue *ifq = &nsintrq;
        !           185:        int len, s;
        !           186: 
        !           187:        if (nsip_hold_input) {
        !           188:                if (nsip_lastin) {
        !           189:                        m_freem(nsip_lastin);
        !           190:                }
        !           191:                nsip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
        !           192:        }
        !           193:        /*
        !           194:         * Get IP and IDP header together in first mbuf.
        !           195:         */
        !           196:        nsipif.if_ipackets++;
        !           197:        s = sizeof (struct ip) + sizeof (struct idp);
        !           198:        if (((m->m_flags & M_EXT) || m->m_len < s) &&
        !           199:            (m = m_pullup(m, s)) == 0) {
        !           200:                nsipif.if_ierrors++;
        !           201:                return;
        !           202:        }
        !           203:        ip = mtod(m, struct ip *);
        !           204:        if (ip->ip_hl > (sizeof (struct ip) >> 2)) {
        !           205:                ip_stripoptions(m, (struct mbuf *)0);
        !           206:                if (m->m_len < s) {
        !           207:                        if ((m = m_pullup(m, s)) == 0) {
        !           208:                                nsipif.if_ierrors++;
        !           209:                                return;
        !           210:                        }
        !           211:                        ip = mtod(m, struct ip *);
        !           212:                }
        !           213:        }
        !           214: 
        !           215:        /*
        !           216:         * Make mbuf data length reflect IDP length.
        !           217:         * If not enough data to reflect IDP length, drop.
        !           218:         */
        !           219:        m->m_data += sizeof (struct ip);
        !           220:        m->m_len -= sizeof (struct ip);
        !           221:        m->m_pkthdr.len -= sizeof (struct ip);
        !           222:        idp = mtod(m, struct idp *);
        !           223:        len = ntohs(idp->idp_len);
        !           224:        if (len & 1) len++;             /* Preserve Garbage Byte */
        !           225:        if (ip->ip_len != len) {
        !           226:                if (len > ip->ip_len) {
        !           227:                        nsipif.if_ierrors++;
        !           228:                        if (nsip_badlen) m_freem(nsip_badlen);
        !           229:                        nsip_badlen = m;
        !           230:                        return;
        !           231:                }
        !           232:                /* Any extra will be trimmed off by the NS routines */
        !           233:        }
        !           234: 
        !           235:        /*
        !           236:         * Place interface pointer before the data
        !           237:         * for the receiving protocol.
        !           238:         */
        !           239:        m->m_pkthdr.rcvif = ifp;
        !           240:        /*
        !           241:         * Deliver to NS
        !           242:         */
        !           243:        s = splimp();
        !           244:        if (IF_QFULL(ifq)) {
        !           245:                IF_DROP(ifq);
        !           246: bad:
        !           247:                m_freem(m);
        !           248:                splx(s);
        !           249:                return;
        !           250:        }
        !           251:        IF_ENQUEUE(ifq, m);
        !           252:        schednetisr(NETISR_NS);
        !           253:        splx(s);
        !           254:        return;
        !           255: }
        !           256: 
        !           257: /* ARGSUSED */
        !           258: nsipoutput(ifn, m, dst)
        !           259:        struct ifnet_en *ifn;
        !           260:        register struct mbuf *m;
        !           261:        struct sockaddr *dst;
        !           262: {
        !           263: 
        !           264:        register struct ip *ip;
        !           265:        register struct route *ro = &(ifn->ifen_route);
        !           266:        register int len = 0;
        !           267:        register struct idp *idp = mtod(m, struct idp *);
        !           268:        int error;
        !           269: 
        !           270:        ifn->ifen_ifnet.if_opackets++;
        !           271:        nsipif.if_opackets++;
        !           272: 
        !           273: 
        !           274:        /*
        !           275:         * Calculate data length and make space
        !           276:         * for IP header.
        !           277:         */
        !           278:        len =  ntohs(idp->idp_len);
        !           279:        if (len & 1) len++;             /* Preserve Garbage Byte */
        !           280:        /* following clause not necessary on vax */
        !           281:        if (3 & (int)m->m_data) {
        !           282:                /* force longword alignment of ip hdr */
        !           283:                struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
        !           284:                if (m0 == 0) {
        !           285:                        m_freem(m);
        !           286:                        return (ENOBUFS);
        !           287:                }
        !           288:                MH_ALIGN(m0, sizeof (struct ip));
        !           289:                m0->m_flags = m->m_flags & M_COPYFLAGS;
        !           290:                m0->m_next = m;
        !           291:                m0->m_len = sizeof (struct ip);
        !           292:                m0->m_pkthdr.len = m0->m_len + m->m_len;
        !           293:                m->m_flags &= ~M_PKTHDR;
        !           294:        } else {
        !           295:                M_PREPEND(m, sizeof (struct ip), M_DONTWAIT);
        !           296:                if (m == 0)
        !           297:                        return (ENOBUFS);
        !           298:        }
        !           299:        /*
        !           300:         * Fill in IP header.
        !           301:         */
        !           302:        ip = mtod(m, struct ip *);
        !           303:        *(long *)ip = 0;
        !           304:        ip->ip_p = IPPROTO_IDP;
        !           305:        ip->ip_src = ifn->ifen_src;
        !           306:        ip->ip_dst = ifn->ifen_dst;
        !           307:        ip->ip_len = (u_short)len + sizeof (struct ip);
        !           308:        ip->ip_ttl = MAXTTL;
        !           309: 
        !           310:        /*
        !           311:         * Output final datagram.
        !           312:         */
        !           313:        error =  (ip_output(m, (struct mbuf *)0, ro, SO_BROADCAST, NULL));
        !           314:        if (error) {
        !           315:                ifn->ifen_ifnet.if_oerrors++;
        !           316:                ifn->ifen_ifnet.if_ierrors = error;
        !           317:        }
        !           318:        return (error);
        !           319: bad:
        !           320:        m_freem(m);
        !           321:        return (ENETUNREACH);
        !           322: }
        !           323: 
        !           324: nsipstart(ifp)
        !           325: struct ifnet *ifp;
        !           326: {
        !           327:        panic("nsip_start called\n");
        !           328: }
        !           329: 
        !           330: struct ifreq ifr = {"nsip0"};
        !           331: 
        !           332: nsip_route(m)
        !           333:        register struct mbuf *m;
        !           334: {
        !           335:        register struct nsip_req *rq = mtod(m, struct nsip_req *);
        !           336:        struct sockaddr_ns *ns_dst = (struct sockaddr_ns *)&rq->rq_ns;
        !           337:        struct sockaddr_in *ip_dst = (struct sockaddr_in *)&rq->rq_ip;
        !           338:        struct route ro;
        !           339:        struct ifnet_en *ifn;
        !           340:        struct sockaddr_in *src;
        !           341: 
        !           342:        /*
        !           343:         * First, make sure we already have an ns address:
        !           344:         */
        !           345:        if (ns_hosteqnh(ns_thishost, ns_zerohost))
        !           346:                return (EADDRNOTAVAIL);
        !           347:        /*
        !           348:         * Now, determine if we can get to the destination
        !           349:         */
        !           350:        bzero((caddr_t)&ro, sizeof (ro));
        !           351:        ro.ro_dst = *(struct sockaddr *)ip_dst;
        !           352:        rtalloc(&ro);
        !           353:        if (ro.ro_rt == 0 || ro.ro_rt->rt_ifp == 0) {
        !           354:                return (ENETUNREACH);
        !           355:        }
        !           356: 
        !           357:        /*
        !           358:         * And see how he's going to get back to us:
        !           359:         * i.e., what return ip address do we use?
        !           360:         */
        !           361:        {
        !           362:                register struct in_ifaddr *ia;
        !           363:                struct ifnet *ifp = ro.ro_rt->rt_ifp;
        !           364: 
        !           365:                for (ia = in_ifaddr; ia; ia = ia->ia_next)
        !           366:                        if (ia->ia_ifp == ifp)
        !           367:                                break;
        !           368:                if (ia == 0)
        !           369:                        ia = in_ifaddr;
        !           370:                if (ia == 0) {
        !           371:                        RTFREE(ro.ro_rt);
        !           372:                        return (EADDRNOTAVAIL);
        !           373:                }
        !           374:                src = (struct sockaddr_in *)&ia->ia_addr;
        !           375:        }
        !           376: 
        !           377:        /*
        !           378:         * Is there a free (pseudo-)interface or space?
        !           379:         */
        !           380:        for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
        !           381:                if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
        !           382:                        break;
        !           383:        }
        !           384:        if (ifn == NULL)
        !           385:                ifn = nsipattach();
        !           386:        if (ifn == NULL) {
        !           387:                RTFREE(ro.ro_rt);
        !           388:                return (ENOBUFS);
        !           389:        }
        !           390:        ifn->ifen_route = ro;
        !           391:        ifn->ifen_dst =  ip_dst->sin_addr;
        !           392:        ifn->ifen_src = src->sin_addr;
        !           393: 
        !           394:        /*
        !           395:         * now configure this as a point to point link
        !           396:         */
        !           397:        ifr.ifr_name[4] = '0' + nsipif.if_unit - 1;
        !           398:        ifr.ifr_dstaddr = * (struct sockaddr *) ns_dst;
        !           399:        (void)ns_control((struct socket *)0, (int)SIOCSIFDSTADDR, (caddr_t)&ifr,
        !           400:                        (struct ifnet *)ifn);
        !           401:        satons_addr(ifr.ifr_addr).x_host = ns_thishost;
        !           402:        return (ns_control((struct socket *)0, (int)SIOCSIFADDR, (caddr_t)&ifr,
        !           403:                        (struct ifnet *)ifn));
        !           404: }
        !           405: 
        !           406: nsip_free(ifp)
        !           407: struct ifnet *ifp;
        !           408: {
        !           409:        register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
        !           410:        struct route *ro = & ifn->ifen_route;
        !           411: 
        !           412:        if (ro->ro_rt) {
        !           413:                RTFREE(ro->ro_rt);
        !           414:                ro->ro_rt = 0;
        !           415:        }
        !           416:        ifp->if_flags &= ~IFF_UP;
        !           417:        return (0);
        !           418: }
        !           419: 
        !           420: nsip_ctlinput(cmd, sa)
        !           421:        int cmd;
        !           422:        struct sockaddr *sa;
        !           423: {
        !           424:        extern u_char inetctlerrmap[];
        !           425:        struct sockaddr_in *sin;
        !           426:        int in_rtchange();
        !           427: 
        !           428:        if ((unsigned)cmd >= PRC_NCMDS)
        !           429:                return;
        !           430:        if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
        !           431:                return;
        !           432:        sin = (struct sockaddr_in *)sa;
        !           433:        if (sin->sin_addr.s_addr == INADDR_ANY)
        !           434:                return;
        !           435: 
        !           436:        switch (cmd) {
        !           437: 
        !           438:        case PRC_ROUTEDEAD:
        !           439:        case PRC_REDIRECT_NET:
        !           440:        case PRC_REDIRECT_HOST:
        !           441:        case PRC_REDIRECT_TOSNET:
        !           442:        case PRC_REDIRECT_TOSHOST:
        !           443:                nsip_rtchange(&sin->sin_addr);
        !           444:                break;
        !           445:        }
        !           446: }
        !           447: 
        !           448: nsip_rtchange(dst)
        !           449:        register struct in_addr *dst;
        !           450: {
        !           451:        register struct ifnet_en *ifn;
        !           452: 
        !           453:        for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
        !           454:                if (ifn->ifen_dst.s_addr == dst->s_addr &&
        !           455:                        ifn->ifen_route.ro_rt) {
        !           456:                                RTFREE(ifn->ifen_route.ro_rt);
        !           457:                                ifn->ifen_route.ro_rt = 0;
        !           458:                }
        !           459:        }
        !           460: }
        !           461: #endif

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