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Annotation of Net2/netns/ns_ip.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1984, 1985, 1986, 1987 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)ns_ip.c     7.6 (Berkeley) 6/28/90
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * Software interface driver for encapsulating ns in ip.
        !            38:  */
        !            39: 
        !            40: #ifdef NSIP
        !            41: #include "param.h"
        !            42: #include "systm.h"
        !            43: #include "malloc.h"
        !            44: #include "mbuf.h"
        !            45: #include "socket.h"
        !            46: #include "socketvar.h"
        !            47: #include "errno.h"
        !            48: #include "ioctl.h"
        !            49: #include "protosw.h"
        !            50: 
        !            51: #include "../net/if.h"
        !            52: #include "../net/netisr.h"
        !            53: #include "../net/route.h"
        !            54: 
        !            55: #include "../netinet/in.h"
        !            56: #include "../netinet/in_systm.h"
        !            57: #include "../netinet/in_var.h"
        !            58: #include "../netinet/ip.h"
        !            59: #include "../netinet/ip_var.h"
        !            60: 
        !            61: #include "machine/mtpr.h"
        !            62: 
        !            63: #include "../netns/ns.h"
        !            64: #include "../netns/ns_if.h"
        !            65: #include "../netns/idp.h"
        !            66: 
        !            67: struct ifnet_en {
        !            68:        struct ifnet ifen_ifnet;
        !            69:        struct route ifen_route;
        !            70:        struct in_addr ifen_src;
        !            71:        struct in_addr ifen_dst;
        !            72:        struct ifnet_en *ifen_next;
        !            73: };
        !            74: 
        !            75: int    nsipoutput(), nsipioctl(), nsipstart();
        !            76: #define LOMTU  (1024+512);
        !            77: 
        !            78: struct ifnet nsipif;
        !            79: struct ifnet_en *nsip_list;            /* list of all hosts and gateways or
        !            80:                                        broadcast addrs */
        !            81: 
        !            82: struct ifnet_en *
        !            83: nsipattach()
        !            84: {
        !            85:        register struct ifnet_en *m;
        !            86:        register struct ifnet *ifp;
        !            87: 
        !            88:        if (nsipif.if_mtu == 0) {
        !            89:                ifp = &nsipif;
        !            90:                ifp->if_name = "nsip";
        !            91:                ifp->if_mtu = LOMTU;
        !            92:                ifp->if_ioctl = nsipioctl;
        !            93:                ifp->if_output = nsipoutput;
        !            94:                ifp->if_start = nsipstart;
        !            95:                ifp->if_flags = IFF_POINTOPOINT;
        !            96:        }
        !            97: 
        !            98:        MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_NOWAIT);
        !            99:        if (m == NULL) return (NULL);
        !           100:        m->ifen_next = nsip_list;
        !           101:        nsip_list = m;
        !           102:        ifp = &m->ifen_ifnet;
        !           103: 
        !           104:        ifp->if_name = "nsip";
        !           105:        ifp->if_mtu = LOMTU;
        !           106:        ifp->if_ioctl = nsipioctl;
        !           107:        ifp->if_output = nsipoutput;
        !           108:        ifp->if_start = nsipstart;
        !           109:        ifp->if_flags = IFF_POINTOPOINT;
        !           110:        ifp->if_unit = nsipif.if_unit++;
        !           111:        if_attach(ifp);
        !           112: 
        !           113:        return (m);
        !           114: }
        !           115: 
        !           116: 
        !           117: /*
        !           118:  * Process an ioctl request.
        !           119:  */
        !           120: /* ARGSUSED */
        !           121: nsipioctl(ifp, cmd, data)
        !           122:        register struct ifnet *ifp;
        !           123:        int cmd;
        !           124:        caddr_t data;
        !           125: {
        !           126:        int error = 0;
        !           127:        struct ifreq *ifr;
        !           128: 
        !           129:        switch (cmd) {
        !           130: 
        !           131:        case SIOCSIFADDR:
        !           132:                ifp->if_flags |= IFF_UP;
        !           133:                /* fall into: */
        !           134: 
        !           135:        case SIOCSIFDSTADDR:
        !           136:                /*
        !           137:                 * Everything else is done at a higher level.
        !           138:                 */
        !           139:                break;
        !           140: 
        !           141:        case SIOCSIFFLAGS:
        !           142:                ifr = (struct ifreq *)data;
        !           143:                if ((ifr->ifr_flags & IFF_UP) == 0)
        !           144:                        error = nsip_free(ifp);
        !           145: 
        !           146: 
        !           147:        default:
        !           148:                error = EINVAL;
        !           149:        }
        !           150:        return (error);
        !           151: }
        !           152: 
        !           153: struct mbuf *nsip_badlen;
        !           154: struct mbuf *nsip_lastin;
        !           155: int nsip_hold_input;
        !           156: 
        !           157: idpip_input(m, ifp)
        !           158:        register struct mbuf *m;
        !           159:        struct ifnet *ifp;
        !           160: {
        !           161:        register struct ip *ip;
        !           162:        register struct idp *idp;
        !           163:        register struct ifqueue *ifq = &nsintrq;
        !           164:        int len, s;
        !           165: 
        !           166:        if (nsip_hold_input) {
        !           167:                if (nsip_lastin) {
        !           168:                        m_freem(nsip_lastin);
        !           169:                }
        !           170:                nsip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
        !           171:        }
        !           172:        /*
        !           173:         * Get IP and IDP header together in first mbuf.
        !           174:         */
        !           175:        nsipif.if_ipackets++;
        !           176:        s = sizeof (struct ip) + sizeof (struct idp);
        !           177:        if (((m->m_flags & M_EXT) || m->m_len < s) &&
        !           178:            (m = m_pullup(m, s)) == 0) {
        !           179:                nsipif.if_ierrors++;
        !           180:                return;
        !           181:        }
        !           182:        ip = mtod(m, struct ip *);
        !           183:        if (ip->ip_hl > (sizeof (struct ip) >> 2)) {
        !           184:                ip_stripoptions(ip, (struct mbuf *)0);
        !           185:                if (m->m_len < s) {
        !           186:                        if ((m = m_pullup(m, s)) == 0) {
        !           187:                                nsipif.if_ierrors++;
        !           188:                                return;
        !           189:                        }
        !           190:                        ip = mtod(m, struct ip *);
        !           191:                }
        !           192:        }
        !           193: 
        !           194:        /*
        !           195:         * Make mbuf data length reflect IDP length.
        !           196:         * If not enough data to reflect IDP length, drop.
        !           197:         */
        !           198:        m->m_data += sizeof (struct ip);
        !           199:        m->m_len -= sizeof (struct ip);
        !           200:        m->m_pkthdr.len -= sizeof (struct ip);
        !           201:        idp = mtod(m, struct idp *);
        !           202:        len = ntohs(idp->idp_len);
        !           203:        if (len & 1) len++;             /* Preserve Garbage Byte */
        !           204:        if (ip->ip_len != len) {
        !           205:                if (len > ip->ip_len) {
        !           206:                        nsipif.if_ierrors++;
        !           207:                        if (nsip_badlen) m_freem(nsip_badlen);
        !           208:                        nsip_badlen = m;
        !           209:                        return;
        !           210:                }
        !           211:                /* Any extra will be trimmed off by the NS routines */
        !           212:        }
        !           213: 
        !           214:        /*
        !           215:         * Place interface pointer before the data
        !           216:         * for the receiving protocol.
        !           217:         */
        !           218:        m->m_pkthdr.rcvif = ifp;
        !           219:        /*
        !           220:         * Deliver to NS
        !           221:         */
        !           222:        s = splimp();
        !           223:        if (IF_QFULL(ifq)) {
        !           224:                IF_DROP(ifq);
        !           225: bad:
        !           226:                m_freem(m);
        !           227:                splx(s);
        !           228:                return;
        !           229:        }
        !           230:        IF_ENQUEUE(ifq, m);
        !           231:        schednetisr(NETISR_NS);
        !           232:        splx(s);
        !           233:        return;
        !           234: }
        !           235: 
        !           236: /* ARGSUSED */
        !           237: nsipoutput(ifn, m, dst)
        !           238:        struct ifnet_en *ifn;
        !           239:        register struct mbuf *m;
        !           240:        struct sockaddr *dst;
        !           241: {
        !           242: 
        !           243:        register struct ip *ip;
        !           244:        register struct route *ro = &(ifn->ifen_route);
        !           245:        register int len = 0;
        !           246:        register struct idp *idp = mtod(m, struct idp *);
        !           247:        int error;
        !           248: 
        !           249:        ifn->ifen_ifnet.if_opackets++;
        !           250:        nsipif.if_opackets++;
        !           251: 
        !           252: 
        !           253:        /*
        !           254:         * Calculate data length and make space
        !           255:         * for IP header.
        !           256:         */
        !           257:        len =  ntohs(idp->idp_len);
        !           258:        if (len & 1) len++;             /* Preserve Garbage Byte */
        !           259:        /* following clause not necessary on vax */
        !           260:        if (3 & (int)m->m_data) {
        !           261:                /* force longword alignment of ip hdr */
        !           262:                struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
        !           263:                if (m0 == 0) {
        !           264:                        m_freem(m);
        !           265:                        return (ENOBUFS);
        !           266:                }
        !           267:                MH_ALIGN(m0, sizeof (struct ip));
        !           268:                m0->m_flags = m->m_flags & M_COPYFLAGS;
        !           269:                m0->m_next = m;
        !           270:                m0->m_len = sizeof (struct ip);
        !           271:                m0->m_pkthdr.len = m0->m_len + m->m_len;
        !           272:                m->m_flags &= ~M_PKTHDR;
        !           273:        } else {
        !           274:                M_PREPEND(m, sizeof (struct ip), M_DONTWAIT);
        !           275:                if (m == 0)
        !           276:                        return (ENOBUFS);
        !           277:        }
        !           278:        /*
        !           279:         * Fill in IP header.
        !           280:         */
        !           281:        ip = mtod(m, struct ip *);
        !           282:        *(long *)ip = 0;
        !           283:        ip->ip_p = IPPROTO_IDP;
        !           284:        ip->ip_src = ifn->ifen_src;
        !           285:        ip->ip_dst = ifn->ifen_dst;
        !           286:        ip->ip_len = (u_short)len + sizeof (struct ip);
        !           287:        ip->ip_ttl = MAXTTL;
        !           288: 
        !           289:        /*
        !           290:         * Output final datagram.
        !           291:         */
        !           292:        error =  (ip_output(m, (struct mbuf *)0, ro, SO_BROADCAST));
        !           293:        if (error) {
        !           294:                ifn->ifen_ifnet.if_oerrors++;
        !           295:                ifn->ifen_ifnet.if_ierrors = error;
        !           296:        }
        !           297:        return (error);
        !           298: bad:
        !           299:        m_freem(m);
        !           300:        return (ENETUNREACH);
        !           301: }
        !           302: 
        !           303: nsipstart(ifp)
        !           304: struct ifnet *ifp;
        !           305: {
        !           306:        panic("nsip_start called\n");
        !           307: }
        !           308: 
        !           309: struct ifreq ifr = {"nsip0"};
        !           310: 
        !           311: nsip_route(m)
        !           312:        register struct mbuf *m;
        !           313: {
        !           314:        register struct nsip_req *rq = mtod(m, struct nsip_req *);
        !           315:        struct sockaddr_ns *ns_dst = (struct sockaddr_ns *)&rq->rq_ns;
        !           316:        struct sockaddr_in *ip_dst = (struct sockaddr_in *)&rq->rq_ip;
        !           317:        struct route ro;
        !           318:        struct ifnet_en *ifn;
        !           319:        struct sockaddr_in *src;
        !           320: 
        !           321:        /*
        !           322:         * First, make sure we already have an ns address:
        !           323:         */
        !           324:        if (ns_hosteqnh(ns_thishost, ns_zerohost))
        !           325:                return (EADDRNOTAVAIL);
        !           326:        /*
        !           327:         * Now, determine if we can get to the destination
        !           328:         */
        !           329:        bzero((caddr_t)&ro, sizeof (ro));
        !           330:        ro.ro_dst = *(struct sockaddr *)ip_dst;
        !           331:        rtalloc(&ro);
        !           332:        if (ro.ro_rt == 0 || ro.ro_rt->rt_ifp == 0) {
        !           333:                return (ENETUNREACH);
        !           334:        }
        !           335: 
        !           336:        /*
        !           337:         * And see how he's going to get back to us:
        !           338:         * i.e., what return ip address do we use?
        !           339:         */
        !           340:        {
        !           341:                register struct in_ifaddr *ia;
        !           342:                struct ifnet *ifp = ro.ro_rt->rt_ifp;
        !           343: 
        !           344:                for (ia = in_ifaddr; ia; ia = ia->ia_next)
        !           345:                        if (ia->ia_ifp == ifp)
        !           346:                                break;
        !           347:                if (ia == 0)
        !           348:                        ia = in_ifaddr;
        !           349:                if (ia == 0) {
        !           350:                        RTFREE(ro.ro_rt);
        !           351:                        return (EADDRNOTAVAIL);
        !           352:                }
        !           353:                src = (struct sockaddr_in *)&ia->ia_addr;
        !           354:        }
        !           355: 
        !           356:        /*
        !           357:         * Is there a free (pseudo-)interface or space?
        !           358:         */
        !           359:        for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
        !           360:                if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
        !           361:                        break;
        !           362:        }
        !           363:        if (ifn == NULL)
        !           364:                ifn = nsipattach();
        !           365:        if (ifn == NULL) {
        !           366:                RTFREE(ro.ro_rt);
        !           367:                return (ENOBUFS);
        !           368:        }
        !           369:        ifn->ifen_route = ro;
        !           370:        ifn->ifen_dst =  ip_dst->sin_addr;
        !           371:        ifn->ifen_src = src->sin_addr;
        !           372: 
        !           373:        /*
        !           374:         * now configure this as a point to point link
        !           375:         */
        !           376:        ifr.ifr_name[4] = '0' + nsipif.if_unit - 1;
        !           377:        ifr.ifr_dstaddr = * (struct sockaddr *) ns_dst;
        !           378:        (void)ns_control((struct socket *)0, (int)SIOCSIFDSTADDR, (caddr_t)&ifr,
        !           379:                        (struct ifnet *)ifn);
        !           380:        satons_addr(ifr.ifr_addr).x_host = ns_thishost;
        !           381:        return (ns_control((struct socket *)0, (int)SIOCSIFADDR, (caddr_t)&ifr,
        !           382:                        (struct ifnet *)ifn));
        !           383: }
        !           384: 
        !           385: nsip_free(ifp)
        !           386: struct ifnet *ifp;
        !           387: {
        !           388:        register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
        !           389:        struct route *ro = & ifn->ifen_route;
        !           390: 
        !           391:        if (ro->ro_rt) {
        !           392:                RTFREE(ro->ro_rt);
        !           393:                ro->ro_rt = 0;
        !           394:        }
        !           395:        ifp->if_flags &= ~IFF_UP;
        !           396:        return (0);
        !           397: }
        !           398: 
        !           399: nsip_ctlinput(cmd, sa)
        !           400:        int cmd;
        !           401:        struct sockaddr *sa;
        !           402: {
        !           403:        extern u_char inetctlerrmap[];
        !           404:        struct sockaddr_in *sin;
        !           405:        int in_rtchange();
        !           406: 
        !           407:        if ((unsigned)cmd >= PRC_NCMDS)
        !           408:                return;
        !           409:        if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
        !           410:                return;
        !           411:        sin = (struct sockaddr_in *)sa;
        !           412:        if (sin->sin_addr.s_addr == INADDR_ANY)
        !           413:                return;
        !           414: 
        !           415:        switch (cmd) {
        !           416: 
        !           417:        case PRC_ROUTEDEAD:
        !           418:        case PRC_REDIRECT_NET:
        !           419:        case PRC_REDIRECT_HOST:
        !           420:        case PRC_REDIRECT_TOSNET:
        !           421:        case PRC_REDIRECT_TOSHOST:
        !           422:                nsip_rtchange(&sin->sin_addr);
        !           423:                break;
        !           424:        }
        !           425: }
        !           426: 
        !           427: nsip_rtchange(dst)
        !           428:        register struct in_addr *dst;
        !           429: {
        !           430:        register struct ifnet_en *ifn;
        !           431: 
        !           432:        for (ifn = nsip_list; ifn; ifn = ifn->ifen_next) {
        !           433:                if (ifn->ifen_dst.s_addr == dst->s_addr &&
        !           434:                        ifn->ifen_route.ro_rt) {
        !           435:                                RTFREE(ifn->ifen_route.ro_rt);
        !           436:                                ifn->ifen_route.ro_rt = 0;
        !           437:                }
        !           438:        }
        !           439: }
        !           440: #endif

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