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Annotation of Net2/netns/ns_pcb.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_pcb.c    7.11 (Berkeley) 6/27/91
        !            34:  */
        !            35: 
        !            36: #include "param.h"
        !            37: #include "systm.h"
        !            38: #include "mbuf.h"
        !            39: #include "errno.h"
        !            40: #include "socket.h"
        !            41: #include "socketvar.h"
        !            42: #include "protosw.h"
        !            43: 
        !            44: #include "../net/if.h"
        !            45: #include "../net/route.h"
        !            46: 
        !            47: #include "ns.h"
        !            48: #include "ns_if.h"
        !            49: #include "ns_pcb.h"
        !            50: 
        !            51: struct ns_addr zerons_addr;
        !            52: 
        !            53: ns_pcballoc(so, head)
        !            54:        struct socket *so;
        !            55:        struct nspcb *head;
        !            56: {
        !            57:        struct mbuf *m;
        !            58:        register struct nspcb *nsp;
        !            59: 
        !            60:        m = m_getclr(M_DONTWAIT, MT_PCB);
        !            61:        if (m == NULL)
        !            62:                return (ENOBUFS);
        !            63:        nsp = mtod(m, struct nspcb *);
        !            64:        nsp->nsp_socket = so;
        !            65:        insque(nsp, head);
        !            66:        so->so_pcb = (caddr_t)nsp;
        !            67:        return (0);
        !            68: }
        !            69:        
        !            70: ns_pcbbind(nsp, nam)
        !            71:        register struct nspcb *nsp;
        !            72:        struct mbuf *nam;
        !            73: {
        !            74:        register struct sockaddr_ns *sns;
        !            75:        u_short lport = 0;
        !            76: 
        !            77:        if (nsp->nsp_lport || !ns_nullhost(nsp->nsp_laddr))
        !            78:                return (EINVAL);
        !            79:        if (nam == 0)
        !            80:                goto noname;
        !            81:        sns = mtod(nam, struct sockaddr_ns *);
        !            82:        if (nam->m_len != sizeof (*sns))
        !            83:                return (EINVAL);
        !            84:        if (!ns_nullhost(sns->sns_addr)) {
        !            85:                int tport = sns->sns_port;
        !            86: 
        !            87:                sns->sns_port = 0;              /* yech... */
        !            88:                if (ifa_ifwithaddr((struct sockaddr *)sns) == 0)
        !            89:                        return (EADDRNOTAVAIL);
        !            90:                sns->sns_port = tport;
        !            91:        }
        !            92:        lport = sns->sns_port;
        !            93:        if (lport) {
        !            94:                u_short aport = ntohs(lport);
        !            95: 
        !            96:                if (aport < NSPORT_RESERVED &&
        !            97:                    (nsp->nsp_socket->so_state & SS_PRIV) == 0)
        !            98:                        return (EACCES);
        !            99:                if (ns_pcblookup(&zerons_addr, lport, 0))
        !           100:                        return (EADDRINUSE);
        !           101:        }
        !           102:        nsp->nsp_laddr = sns->sns_addr;
        !           103: noname:
        !           104:        if (lport == 0)
        !           105:                do {
        !           106:                        if (nspcb.nsp_lport++ < NSPORT_RESERVED)
        !           107:                                nspcb.nsp_lport = NSPORT_RESERVED;
        !           108:                        lport = htons(nspcb.nsp_lport);
        !           109:                } while (ns_pcblookup(&zerons_addr, lport, 0));
        !           110:        nsp->nsp_lport = lport;
        !           111:        return (0);
        !           112: }
        !           113: 
        !           114: /*
        !           115:  * Connect from a socket to a specified address.
        !           116:  * Both address and port must be specified in argument sns.
        !           117:  * If don't have a local address for this socket yet,
        !           118:  * then pick one.
        !           119:  */
        !           120: ns_pcbconnect(nsp, nam)
        !           121:        struct nspcb *nsp;
        !           122:        struct mbuf *nam;
        !           123: {
        !           124:        struct ns_ifaddr *ia;
        !           125:        register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
        !           126:        register struct ns_addr *dst;
        !           127:        register struct route *ro;
        !           128:        struct ifnet *ifp;
        !           129: 
        !           130:        if (nam->m_len != sizeof (*sns))
        !           131:                return (EINVAL);
        !           132:        if (sns->sns_family != AF_NS)
        !           133:                return (EAFNOSUPPORT);
        !           134:        if (sns->sns_port==0 || ns_nullhost(sns->sns_addr))
        !           135:                return (EADDRNOTAVAIL);
        !           136:        /*
        !           137:         * If we haven't bound which network number to use as ours,
        !           138:         * we will use the number of the outgoing interface.
        !           139:         * This depends on having done a routing lookup, which
        !           140:         * we will probably have to do anyway, so we might
        !           141:         * as well do it now.  On the other hand if we are
        !           142:         * sending to multiple destinations we may have already
        !           143:         * done the lookup, so see if we can use the route
        !           144:         * from before.  In any case, we only
        !           145:         * chose a port number once, even if sending to multiple
        !           146:         * destinations.
        !           147:         */
        !           148:        ro = &nsp->nsp_route;
        !           149:        dst = &satons_addr(ro->ro_dst);
        !           150:        if (nsp->nsp_socket->so_options & SO_DONTROUTE)
        !           151:                goto flush;
        !           152:        if (!ns_neteq(nsp->nsp_lastdst, sns->sns_addr))
        !           153:                goto flush;
        !           154:        if (!ns_hosteq(nsp->nsp_lastdst, sns->sns_addr)) {
        !           155:                if (ro->ro_rt && ! (ro->ro_rt->rt_flags & RTF_HOST)) {
        !           156:                        /* can patch route to avoid rtalloc */
        !           157:                        *dst = sns->sns_addr;
        !           158:                } else {
        !           159:        flush:
        !           160:                        if (ro->ro_rt)
        !           161:                                RTFREE(ro->ro_rt);
        !           162:                        ro->ro_rt = (struct rtentry *)0;
        !           163:                        nsp->nsp_laddr.x_net = ns_zeronet;
        !           164:                }
        !           165:        }/* else cached route is ok; do nothing */
        !           166:        nsp->nsp_lastdst = sns->sns_addr;
        !           167:        if ((nsp->nsp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
        !           168:            (ro->ro_rt == (struct rtentry *)0 ||
        !           169:             ro->ro_rt->rt_ifp == (struct ifnet *)0)) {
        !           170:                    /* No route yet, so try to acquire one */
        !           171:                    ro->ro_dst.sa_family = AF_NS;
        !           172:                    ro->ro_dst.sa_len = sizeof(ro->ro_dst);
        !           173:                    *dst = sns->sns_addr;
        !           174:                    dst->x_port = 0;
        !           175:                    rtalloc(ro);
        !           176:        }
        !           177:        if (ns_neteqnn(nsp->nsp_laddr.x_net, ns_zeronet)) {
        !           178:                /* 
        !           179:                 * If route is known or can be allocated now,
        !           180:                 * our src addr is taken from the i/f, else punt.
        !           181:                 */
        !           182: 
        !           183:                ia = (struct ns_ifaddr *)0;
        !           184:                /*
        !           185:                 * If we found a route, use the address
        !           186:                 * corresponding to the outgoing interface
        !           187:                 */
        !           188:                if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp))
        !           189:                        for (ia = ns_ifaddr; ia; ia = ia->ia_next)
        !           190:                                if (ia->ia_ifp == ifp)
        !           191:                                        break;
        !           192:                if (ia == 0) {
        !           193:                        u_short fport = sns->sns_addr.x_port;
        !           194:                        sns->sns_addr.x_port = 0;
        !           195:                        ia = (struct ns_ifaddr *)
        !           196:                                ifa_ifwithdstaddr((struct sockaddr *)sns);
        !           197:                        sns->sns_addr.x_port = fport;
        !           198:                        if (ia == 0)
        !           199:                                ia = ns_iaonnetof(&sns->sns_addr);
        !           200:                        if (ia == 0)
        !           201:                                ia = ns_ifaddr;
        !           202:                        if (ia == 0)
        !           203:                                return (EADDRNOTAVAIL);
        !           204:                }
        !           205:                nsp->nsp_laddr.x_net = satons_addr(ia->ia_addr).x_net;
        !           206:        }
        !           207:        if (ns_pcblookup(&sns->sns_addr, nsp->nsp_lport, 0))
        !           208:                return (EADDRINUSE);
        !           209:        if (ns_nullhost(nsp->nsp_laddr)) {
        !           210:                if (nsp->nsp_lport == 0)
        !           211:                        (void) ns_pcbbind(nsp, (struct mbuf *)0);
        !           212:                nsp->nsp_laddr.x_host = ns_thishost;
        !           213:        }
        !           214:        nsp->nsp_faddr = sns->sns_addr;
        !           215:        /* Includes nsp->nsp_fport = sns->sns_port; */
        !           216:        return (0);
        !           217: }
        !           218: 
        !           219: ns_pcbdisconnect(nsp)
        !           220:        struct nspcb *nsp;
        !           221: {
        !           222: 
        !           223:        nsp->nsp_faddr = zerons_addr;
        !           224:        if (nsp->nsp_socket->so_state & SS_NOFDREF)
        !           225:                ns_pcbdetach(nsp);
        !           226: }
        !           227: 
        !           228: ns_pcbdetach(nsp)
        !           229:        struct nspcb *nsp;
        !           230: {
        !           231:        struct socket *so = nsp->nsp_socket;
        !           232: 
        !           233:        so->so_pcb = 0;
        !           234:        sofree(so);
        !           235:        if (nsp->nsp_route.ro_rt)
        !           236:                rtfree(nsp->nsp_route.ro_rt);
        !           237:        remque(nsp);
        !           238:        (void) m_free(dtom(nsp));
        !           239: }
        !           240: 
        !           241: ns_setsockaddr(nsp, nam)
        !           242:        register struct nspcb *nsp;
        !           243:        struct mbuf *nam;
        !           244: {
        !           245:        register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
        !           246:        
        !           247:        nam->m_len = sizeof (*sns);
        !           248:        sns = mtod(nam, struct sockaddr_ns *);
        !           249:        bzero((caddr_t)sns, sizeof (*sns));
        !           250:        sns->sns_len = sizeof(*sns);
        !           251:        sns->sns_family = AF_NS;
        !           252:        sns->sns_addr = nsp->nsp_laddr;
        !           253: }
        !           254: 
        !           255: ns_setpeeraddr(nsp, nam)
        !           256:        register struct nspcb *nsp;
        !           257:        struct mbuf *nam;
        !           258: {
        !           259:        register struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
        !           260:        
        !           261:        nam->m_len = sizeof (*sns);
        !           262:        sns = mtod(nam, struct sockaddr_ns *);
        !           263:        bzero((caddr_t)sns, sizeof (*sns));
        !           264:        sns->sns_len = sizeof(*sns);
        !           265:        sns->sns_family = AF_NS;
        !           266:        sns->sns_addr  = nsp->nsp_faddr;
        !           267: }
        !           268: 
        !           269: /*
        !           270:  * Pass some notification to all connections of a protocol
        !           271:  * associated with address dst.  Call the
        !           272:  * protocol specific routine to handle each connection.
        !           273:  * Also pass an extra paramter via the nspcb. (which may in fact
        !           274:  * be a parameter list!)
        !           275:  */
        !           276: ns_pcbnotify(dst, errno, notify, param)
        !           277:        register struct ns_addr *dst;
        !           278:        long param;
        !           279:        int errno, (*notify)();
        !           280: {
        !           281:        register struct nspcb *nsp, *oinp;
        !           282:        int s = splimp();
        !           283: 
        !           284:        for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb);) {
        !           285:                if (!ns_hosteq(*dst,nsp->nsp_faddr)) {
        !           286:        next:
        !           287:                        nsp = nsp->nsp_next;
        !           288:                        continue;
        !           289:                }
        !           290:                if (nsp->nsp_socket == 0)
        !           291:                        goto next;
        !           292:                if (errno) 
        !           293:                        nsp->nsp_socket->so_error = errno;
        !           294:                oinp = nsp;
        !           295:                nsp = nsp->nsp_next;
        !           296:                oinp->nsp_notify_param = param;
        !           297:                (*notify)(oinp);
        !           298:        }
        !           299:        splx(s);
        !           300: }
        !           301: 
        !           302: #ifdef notdef
        !           303: /*
        !           304:  * After a routing change, flush old routing
        !           305:  * and allocate a (hopefully) better one.
        !           306:  */
        !           307: ns_rtchange(nsp)
        !           308:        struct nspcb *nsp;
        !           309: {
        !           310:        if (nsp->nsp_route.ro_rt) {
        !           311:                rtfree(nsp->nsp_route.ro_rt);
        !           312:                nsp->nsp_route.ro_rt = 0;
        !           313:                /*
        !           314:                 * A new route can be allocated the next time
        !           315:                 * output is attempted.
        !           316:                 */
        !           317:        }
        !           318:        /* SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */
        !           319: }
        !           320: #endif
        !           321: 
        !           322: struct nspcb *
        !           323: ns_pcblookup(faddr, lport, wildp)
        !           324:        struct ns_addr *faddr;
        !           325:        u_short lport;
        !           326: {
        !           327:        register struct nspcb *nsp, *match = 0;
        !           328:        int matchwild = 3, wildcard;
        !           329:        u_short fport;
        !           330: 
        !           331:        fport = faddr->x_port;
        !           332:        for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb); nsp = nsp->nsp_next) {
        !           333:                if (nsp->nsp_lport != lport)
        !           334:                        continue;
        !           335:                wildcard = 0;
        !           336:                if (ns_nullhost(nsp->nsp_faddr)) {
        !           337:                        if (!ns_nullhost(*faddr))
        !           338:                                wildcard++;
        !           339:                } else {
        !           340:                        if (ns_nullhost(*faddr))
        !           341:                                wildcard++;
        !           342:                        else {
        !           343:                                if (!ns_hosteq(nsp->nsp_faddr, *faddr))
        !           344:                                        continue;
        !           345:                                if (nsp->nsp_fport != fport) {
        !           346:                                        if (nsp->nsp_fport != 0)
        !           347:                                                continue;
        !           348:                                        else
        !           349:                                                wildcard++;
        !           350:                                }
        !           351:                        }
        !           352:                }
        !           353:                if (wildcard && wildp==0)
        !           354:                        continue;
        !           355:                if (wildcard < matchwild) {
        !           356:                        match = nsp;
        !           357:                        matchwild = wildcard;
        !           358:                        if (wildcard == 0)
        !           359:                                break;
        !           360:                }
        !           361:        }
        !           362:        return (match);
        !           363: }

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