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Annotation of kernel/bsd/netns/ns_ip.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*
        !            26:  * Copyright (c) 1984, 1985, 1986, 1987, 1993
        !            27:  *     The Regents of the University of California.  All rights reserved.
        !            28:  *
        !            29:  * Redistribution and use in source and binary forms, with or without
        !            30:  * modification, are permitted provided that the following conditions
        !            31:  * are met:
        !            32:  * 1. Redistributions of source code must retain the above copyright
        !            33:  *    notice, this list of conditions and the following disclaimer.
        !            34:  * 2. Redistributions in binary form must reproduce the above copyright
        !            35:  *    notice, this list of conditions and the following disclaimer in the
        !            36:  *    documentation and/or other materials provided with the distribution.
        !            37:  * 3. All advertising materials mentioning features or use of this software
        !            38:  *    must display the following acknowledgement:
        !            39:  *     This product includes software developed by the University of
        !            40:  *     California, Berkeley and its contributors.
        !            41:  * 4. Neither the name of the University nor the names of its contributors
        !            42:  *    may be used to endorse or promote products derived from this software
        !            43:  *    without specific prior written permission.
        !            44:  *
        !            45:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            46:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            47:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            48:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            49:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            50:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            51:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            52:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            53:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            54:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            55:  * SUCH DAMAGE.
        !            56:  *
        !            57:  *     @(#)ns_ip.c     8.1 (Berkeley) 6/10/93
        !            58:  */
        !            59: 
        !            60: /*
        !            61:  * Software interface driver for encapsulating ns in ip.
        !            62:  */
        !            63: 
        !            64: #ifdef NSIP
        !            65: #include <sys/param.h>
        !            66: #include <sys/systm.h>
        !            67: #include <sys/malloc.h>
        !            68: #include <sys/mbuf.h>
        !            69: #include <sys/socket.h>
        !            70: #include <sys/socketvar.h>
        !            71: #include <sys/errno.h>
        !            72: #include <sys/ioctl.h>
        !            73: #include <sys/protosw.h>
        !            74: 
        !            75: #include <net/if.h>
        !            76: #include <net/netisr.h>
        !            77: #include <net/route.h>
        !            78: 
        !            79: #include <netinet/in.h>
        !            80: #include <netinet/in_systm.h>
        !            81: #include <netinet/in_var.h>
        !            82: #include <netinet/ip.h>
        !            83: #include <netinet/ip_var.h>
        !            84: 
        !            85: #include <machine/mtpr.h>
        !            86: 
        !            87: #include <netns/ns.h>
        !            88: #include <netns/ns_if.h>
        !            89: #include <netns/idp.h>
        !            90: 
        !            91: struct ifnet_en {
        !            92:        struct ifnet ifen_ifnet;
        !            93:        struct route ifen_route;
        !            94:        struct in_addr ifen_src;
        !            95:        struct in_addr ifen_dst;
        !            96:        struct ifnet_en *ifen_next;
        !            97: };
        !            98: 
        !            99: int    nsipoutput(), nsipioctl(), nsipstart();
        !           100: #define LOMTU  (1024+512);
        !           101: 
        !           102: struct ifnet nsipif;
        !           103: struct ifnet_en *nsip_list;            /* list of all hosts and gateways or
        !           104:                                        broadcast addrs */
        !           105: 
        !           106: struct ifnet_en *
        !           107: nsipattach()
        !           108: {
        !           109:        register struct ifnet_en *m;
        !           110:        register struct ifnet *ifp;
        !           111: 
        !           112:        if (nsipif.if_mtu == 0) {
        !           113:                ifp = &nsipif;
        !           114:                ifp->if_name = "nsip";
        !           115:                ifp->if_mtu = LOMTU;
        !           116:                ifp->if_ioctl = nsipioctl;
        !           117:                ifp->if_output = nsipoutput;
        !           118:                ifp->if_start = nsipstart;
        !           119:                ifp->if_flags = IFF_POINTOPOINT;
        !           120:        }
        !           121: 
        !           122:        MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_NOWAIT);
        !           123:        if (m == NULL) return (NULL);
        !           124:        m->ifen_next = nsip_list;
        !           125:        nsip_list = m;
        !           126:        ifp = &m->ifen_ifnet;
        !           127: 
        !           128:        ifp->if_name = "nsip";
        !           129:        ifp->if_mtu = LOMTU;
        !           130:        ifp->if_ioctl = nsipioctl;
        !           131:        ifp->if_output = nsipoutput;
        !           132:        ifp->if_start = nsipstart;
        !           133:        ifp->if_flags = IFF_POINTOPOINT;
        !           134:        ifp->if_unit = nsipif.if_unit++;
        !           135:        if_attach(ifp);
        !           136: 
        !           137:        return (m);
        !           138: }
        !           139: 
        !           140: 
        !           141: /*
        !           142:  * Process an ioctl request.
        !           143:  */
        !           144: /* ARGSUSED */
        !           145: nsipioctl(ifp, cmd, data)
        !           146:        register struct ifnet *ifp;
        !           147:        int cmd;
        !           148:        caddr_t data;
        !           149: {
        !           150:        int error = 0;
        !           151:        struct ifreq *ifr;
        !           152: 
        !           153:        switch (cmd) {
        !           154: 
        !           155:        case SIOCSIFADDR:
        !           156:                ifp->if_flags |= IFF_UP;
        !           157:                /* fall into: */
        !           158: 
        !           159:        case SIOCSIFDSTADDR:
        !           160:                /*
        !           161:                 * Everything else is done at a higher level.
        !           162:                 */
        !           163:                break;
        !           164: 
        !           165:        case SIOCSIFFLAGS:
        !           166:                ifr = (struct ifreq *)data;
        !           167:                if ((ifr->ifr_flags & IFF_UP) == 0)
        !           168:                        error = nsip_free(ifp);
        !           169: 
        !           170: 
        !           171:        default:
        !           172:                error = EINVAL;
        !           173:        }
        !           174:        return (error);
        !           175: }
        !           176: 
        !           177: struct mbuf *nsip_badlen;
        !           178: struct mbuf *nsip_lastin;
        !           179: int nsip_hold_input;
        !           180: 
        !           181: idpip_input(m, ifp)
        !           182:        register struct mbuf *m;
        !           183:        struct ifnet *ifp;
        !           184: {
        !           185:        register struct ip *ip;
        !           186:        register struct idp *idp;
        !           187:        register struct ifqueue *ifq = &nsintrq;
        !           188:        int len, s;
        !           189: 
        !           190:        if (nsip_hold_input) {
        !           191:                if (nsip_lastin) {
        !           192:                        m_freem(nsip_lastin);
        !           193:                }
        !           194:                nsip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
        !           195:        }
        !           196:        /*
        !           197:         * Get IP and IDP header together in first mbuf.
        !           198:         */
        !           199:        nsipif.if_ipackets++;
        !           200:        s = sizeof (struct ip) + sizeof (struct idp);
        !           201:        if (((m->m_flags & M_EXT) || m->m_len < s) &&
        !           202:            (m = m_pullup(m, s)) == 0) {
        !           203:                nsipif.if_ierrors++;
        !           204:                return;
        !           205:        }
        !           206:        ip = mtod(m, struct ip *);
        !           207:        if (ip->ip_hl > (sizeof (struct ip) >> 2)) {
        !           208:                ip_stripoptions(m, (struct mbuf *)0);
        !           209:                if (m->m_len < s) {
        !           210:                        if ((m = m_pullup(m, s)) == 0) {
        !           211:                                nsipif.if_ierrors++;
        !           212:                                return;
        !           213:                        }
        !           214:                        ip = mtod(m, struct ip *);
        !           215:                }
        !           216:        }
        !           217: 
        !           218:        /*
        !           219:         * Make mbuf data length reflect IDP length.
        !           220:         * If not enough data to reflect IDP length, drop.
        !           221:         */
        !           222:        m->m_data += sizeof (struct ip);
        !           223:        m->m_len -= sizeof (struct ip);
        !           224:        m->m_pkthdr.len -= sizeof (struct ip);
        !           225:        idp = mtod(m, struct idp *);
        !           226:        len = ntohs(idp->idp_len);
        !           227:        if (len & 1) len++;             /* Preserve Garbage Byte */
        !           228:        if (ip->ip_len != len) {
        !           229:                if (len > ip->ip_len) {
        !           230:                        nsipif.if_ierrors++;
        !           231:                        if (nsip_badlen) m_freem(nsip_badlen);
        !           232:                        nsip_badlen = m;
        !           233:                        return;
        !           234:                }
        !           235:                /* Any extra will be trimmed off by the NS routines */
        !           236:        }
        !           237: 
        !           238:        /*
        !           239:         * Place interface pointer before the data
        !           240:         * for the receiving protocol.
        !           241:         */
        !           242:        m->m_pkthdr.rcvif = ifp;
        !           243:        /*
        !           244:         * Deliver to NS
        !           245:         */
        !           246:        s = splimp();
        !           247:        if (IF_QFULL(ifq)) {
        !           248:                IF_DROP(ifq);
        !           249: bad:
        !           250:                m_freem(m);
        !           251:                splx(s);
        !           252:                return;
        !           253:        }
        !           254:        IF_ENQUEUE(ifq, m);
        !           255:        schednetisr(NETISR_NS);
        !           256:        splx(s);
        !           257:        return;
        !           258: }
        !           259: 
        !           260: /* ARGSUSED */
        !           261: nsipoutput(ifn, m, dst)
        !           262:        struct ifnet_en *ifn;
        !           263:        register struct mbuf *m;
        !           264:        struct sockaddr *dst;
        !           265: {
        !           266: 
        !           267:        register struct ip *ip;
        !           268:        register struct route *ro = &(ifn->ifen_route);
        !           269:        register int len = 0;
        !           270:        register struct idp *idp = mtod(m, struct idp *);
        !           271:        int error;
        !           272: 
        !           273:        ifn->ifen_ifnet.if_opackets++;
        !           274:        nsipif.if_opackets++;
        !           275: 
        !           276: 
        !           277:        /*
        !           278:         * Calculate data length and make space
        !           279:         * for IP header.
        !           280:         */
        !           281:        len =  ntohs(idp->idp_len);
        !           282:        if (len & 1) len++;             /* Preserve Garbage Byte */
        !           283:        /* following clause not necessary on vax */
        !           284:        if (3 & (int)m->m_data) {
        !           285:                /* force longword alignment of ip hdr */
        !           286:                struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
        !           287:                if (m0 == 0) {
        !           288:                        m_freem(m);
        !           289:                        return (ENOBUFS);
        !           290:                }
        !           291:                MH_ALIGN(m0, sizeof (struct ip));
        !           292:                m0->m_flags = m->m_flags & M_COPYFLAGS;
        !           293:                m0->m_next = m;
        !           294:                m0->m_len = sizeof (struct ip);
        !           295:                m0->m_pkthdr.len = m0->m_len + m->m_len;
        !           296:                m->m_flags &= ~M_PKTHDR;
        !           297:        } else {
        !           298:                M_PREPEND(m, sizeof (struct ip), M_DONTWAIT);
        !           299:                if (m == 0)
        !           300:                        return (ENOBUFS);
        !           301:        }
        !           302:        /*
        !           303:         * Fill in IP header.
        !           304:         */
        !           305:        ip = mtod(m, struct ip *);
        !           306:        *(long *)ip = 0;
        !           307:        ip->ip_p = IPPROTO_IDP;
        !           308:        ip->ip_src = ifn->ifen_src;
        !           309:        ip->ip_dst = ifn->ifen_dst;
        !           310:        ip->ip_len = (u_short)len + sizeof (struct ip);
        !           311:        ip->ip_ttl = MAXTTL;
        !           312: 
        !           313:        /*
        !           314:         * Output final datagram.
        !           315:         */
        !           316:        error =  (ip_output(m, (struct mbuf *)0, ro, SO_BROADCAST, NULL));
        !           317:        if (error) {
        !           318:                ifn->ifen_ifnet.if_oerrors++;
        !           319:                ifn->ifen_ifnet.if_ierrors = error;
        !           320:        }
        !           321:        return (error);
        !           322: bad:
        !           323:        m_freem(m);
        !           324:        return (ENETUNREACH);
        !           325: }
        !           326: 
        !           327: nsipstart(ifp)
        !           328: struct ifnet *ifp;
        !           329: {
        !           330:        panic("nsip_start called\n");
        !           331: }
        !           332: 
        !           333: struct ifreq ifr = {"nsip0"};
        !           334: 
        !           335: nsip_route(m)
        !           336:        register struct mbuf *m;
        !           337: {
        !           338:        register struct nsip_req *rq = mtod(m, struct nsip_req *);
        !           339:        struct sockaddr_ns *ns_dst = (struct sockaddr_ns *)&rq->rq_ns;
        !           340:        struct sockaddr_in *ip_dst = (struct sockaddr_in *)&rq->rq_ip;
        !           341:        struct route ro;
        !           342:        struct ifnet_en *ifn;
        !           343:        struct sockaddr_in *src;
        !           344: 
        !           345:        /*
        !           346:         * First, make sure we already have an ns address:
        !           347:         */
        !           348:        if (ns_hosteqnh(ns_thishost, ns_zerohost))
        !           349:                return (EADDRNOTAVAIL);
        !           350:        /*
        !           351:         * Now, determine if we can get to the destination
        !           352:         */
        !           353:        bzero((caddr_t)&ro, sizeof (ro));
        !           354:        ro.ro_dst = *(struct sockaddr *)ip_dst;
        !           355:        rtalloc(&ro);
        !           356:        if (ro.ro_rt == 0 || ro.ro_rt->rt_ifp == 0) {
        !           357:                return (ENETUNREACH);
        !           358:        }
        !           359: 
        !           360:        /*
        !           361:         * And see how he's going to get back to us:
        !           362:         * i.e., what return ip address do we use?
        !           363:         */
        !           364:        {
        !           365:                register struct in_ifaddr *ia;
        !           366:                struct ifnet *ifp = ro.ro_rt->rt_ifp;
        !           367: 
        !           368:                for (ia = in_ifaddr; ia; ia = ia->ia_next)
        !           369:                        if (ia->ia_ifp == ifp)
        !           370:                                break;
        !           371:                if (ia == 0)
        !           372:                        ia = in_ifaddr;
        !           373:                if (ia == 0) {
        !           374:                        RTFREE(ro.ro_rt);
        !           375:                        return (EADDRNOTAVAIL);
        !           376:                }
        !           377:                src = (struct sockaddr_in *)&ia->ia_addr;
        !           378:        }
        !           379: 
        !           380:        /*
        !           381:         * Is there a free (pseudo-)interface or space?
        !           382:         */
        !           383:        for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
        !           384:                if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
        !           385:                        break;
        !           386:        }
        !           387:        if (ifn == NULL)
        !           388:                ifn = nsipattach();
        !           389:        if (ifn == NULL) {
        !           390:                RTFREE(ro.ro_rt);
        !           391:                return (ENOBUFS);
        !           392:        }
        !           393:        ifn->ifen_route = ro;
        !           394:        ifn->ifen_dst =  ip_dst->sin_addr;
        !           395:        ifn->ifen_src = src->sin_addr;
        !           396: 
        !           397:        /*
        !           398:         * now configure this as a point to point link
        !           399:         */
        !           400:        ifr.ifr_name[4] = '0' + nsipif.if_unit - 1;
        !           401:        ifr.ifr_dstaddr = * (struct sockaddr *) ns_dst;
        !           402:        (void)ns_control((struct socket *)0, (int)SIOCSIFDSTADDR, (caddr_t)&ifr,
        !           403:                        (struct ifnet *)ifn);
        !           404:        satons_addr(ifr.ifr_addr).x_host = ns_thishost;
        !           405:        return (ns_control((struct socket *)0, (int)SIOCSIFADDR, (caddr_t)&ifr,
        !           406:                        (struct ifnet *)ifn));
        !           407: }
        !           408: 
        !           409: nsip_free(ifp)
        !           410: struct ifnet *ifp;
        !           411: {
        !           412:        register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
        !           413:        struct route *ro = & ifn->ifen_route;
        !           414: 
        !           415:        if (ro->ro_rt) {
        !           416:                RTFREE(ro->ro_rt);
        !           417:                ro->ro_rt = 0;
        !           418:        }
        !           419:        ifp->if_flags &= ~IFF_UP;
        !           420:        return (0);
        !           421: }
        !           422: 
        !           423: nsip_ctlinput(cmd, sa)
        !           424:        int cmd;
        !           425:        struct sockaddr *sa;
        !           426: {
        !           427:        extern u_char inetctlerrmap[];
        !           428:        struct sockaddr_in *sin;
        !           429:        int in_rtchange();
        !           430: 
        !           431:        if ((unsigned)cmd >= PRC_NCMDS)
        !           432:                return;
        !           433:        if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
        !           434:                return;
        !           435:        sin = (struct sockaddr_in *)sa;
        !           436:        if (sin->sin_addr.s_addr == INADDR_ANY)
        !           437:                return;
        !           438: 
        !           439:        switch (cmd) {
        !           440: 
        !           441:        case PRC_ROUTEDEAD:
        !           442:        case PRC_REDIRECT_NET:
        !           443:        case PRC_REDIRECT_HOST:
        !           444:        case PRC_REDIRECT_TOSNET:
        !           445:        case PRC_REDIRECT_TOSHOST:
        !           446:                nsip_rtchange(&sin->sin_addr);
        !           447:                break;
        !           448:        }
        !           449: }
        !           450: 
        !           451: nsip_rtchange(dst)
        !           452:        register struct in_addr *dst;
        !           453: {
        !           454:        register struct ifnet_en *ifn;
        !           455: 
        !           456:        for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
        !           457:                if (ifn->ifen_dst.s_addr == dst->s_addr &&
        !           458:                        ifn->ifen_route.ro_rt) {
        !           459:                                RTFREE(ifn->ifen_route.ro_rt);
        !           460:                                ifn->ifen_route.ro_rt = 0;
        !           461:                }
        !           462:        }
        !           463: }
        !           464: #endif

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