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Annotation of Net2/netccitt/pk_usrreq.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) University of British Columbia, 1984
        !             3:  * Copyright (c) 1990 The Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * This code is derived from software contributed to Berkeley by
        !             7:  * the Laboratory for Computation Vision and the Computer Science Department
        !             8:  * of the University of British Columbia.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. All advertising materials mentioning features or use of this software
        !            19:  *    must display the following acknowledgement:
        !            20:  *     This product includes software developed by the University of
        !            21:  *     California, Berkeley and its contributors.
        !            22:  * 4. Neither the name of the University nor the names of its contributors
        !            23:  *    may be used to endorse or promote products derived from this software
        !            24:  *    without specific prior written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            36:  * SUCH DAMAGE.
        !            37:  *
        !            38:  *     @(#)pk_usrreq.c 7.16 (Berkeley) 6/27/91
        !            39:  */
        !            40: 
        !            41: #include "param.h"
        !            42: #include "systm.h"
        !            43: #include "mbuf.h"
        !            44: #include "socket.h"
        !            45: #include "socketvar.h"
        !            46: #include "protosw.h"
        !            47: #include "errno.h"
        !            48: #include "ioctl.h"
        !            49: #include "stat.h"
        !            50: 
        !            51: #include "../net/if.h"
        !            52: #include "../net/route.h"
        !            53: 
        !            54: #include "x25.h"
        !            55: #include "pk.h"
        !            56: #include "pk_var.h"
        !            57: 
        !            58: /*
        !            59:  * 
        !            60:  *  X.25 Packet level protocol interface to socket abstraction.
        !            61:  *
        !            62:  *  Process an X.25 user request on a logical channel.  If this is a send
        !            63:  *  request then m is the mbuf chain of the send data. If this is a timer
        !            64:  *  expiration (called from the software clock routine) them timertype is
        !            65:  *  the particular timer.
        !            66:  *
        !            67:  */
        !            68: 
        !            69: pk_usrreq (so, req, m, nam, control)
        !            70: struct socket *so;
        !            71: int req;
        !            72: register struct mbuf *m, *nam;
        !            73: struct mbuf *control;
        !            74: {
        !            75:        register struct pklcd *lcp = (struct pklcd *) so -> so_pcb;
        !            76:        register int error = 0;
        !            77: 
        !            78:        if (req == PRU_CONTROL)
        !            79:                return (pk_control (so, (int)m, (caddr_t)nam,
        !            80:                        (struct ifnet *)control));
        !            81:        if (control && control -> m_len) {
        !            82:                error = EINVAL;
        !            83:                goto release;
        !            84:        }
        !            85:        if (lcp == NULL && req != PRU_ATTACH) {
        !            86:                error = EINVAL;
        !            87:                goto release;
        !            88:        }
        !            89: 
        !            90: /*
        !            91:        pk_trace (pkcbhead, TR_USER, (struct pklcd *)0,
        !            92:                req, (struct x25_packet *)0);
        !            93: */
        !            94: 
        !            95:        switch (req) {
        !            96:        /* 
        !            97:         *  X.25 attaches to socket via PRU_ATTACH and allocates a logical
        !            98:         *  channel descriptor.  If the socket is to  receive connections,
        !            99:         *  then the LISTEN state is entered.
        !           100:         */
        !           101:        case PRU_ATTACH: 
        !           102:                if (lcp) {
        !           103:                        error = EISCONN;
        !           104:                        /* Socket already connected. */
        !           105:                        break;
        !           106:                }
        !           107:                lcp = pk_attach (so);
        !           108:                if (lcp == 0)
        !           109:                        error = ENOBUFS;
        !           110:                break;
        !           111: 
        !           112:        /* 
        !           113:         *  Detach a logical channel from the socket. If the state of the
        !           114:         *  channel is embryonic, simply discard it. Otherwise we have to 
        !           115:         *  initiate a PRU_DISCONNECT which will finish later.
        !           116:         */
        !           117:        case PRU_DETACH: 
        !           118:                pk_disconnect (lcp);
        !           119:                break;
        !           120: 
        !           121:        /* 
        !           122:         *  Give the socket an address.
        !           123:         */
        !           124:        case PRU_BIND: 
        !           125:                if (nam -> m_len == sizeof (struct x25_sockaddr))
        !           126:                        old_to_new (nam);
        !           127:                error = pk_bind (lcp, nam);
        !           128:                break;
        !           129: 
        !           130:        /* 
        !           131:         *  Prepare to accept connections.
        !           132:         */
        !           133:        case PRU_LISTEN: 
        !           134:                error = pk_listen (lcp);
        !           135:                break;
        !           136: 
        !           137:        /* 
        !           138:         *  Initiate a CALL REQUEST to peer entity. Enter state SENT_CALL
        !           139:         *  and mark the socket as connecting. Set timer waiting for 
        !           140:         *  CALL ACCEPT or CLEAR.
        !           141:         */
        !           142:        case PRU_CONNECT: 
        !           143:                if (nam -> m_len == sizeof (struct x25_sockaddr))
        !           144:                        old_to_new (nam);
        !           145:                if (pk_checksockaddr (nam))
        !           146:                        return (EINVAL);
        !           147:                error = pk_connect (lcp, mtod (nam, struct sockaddr_x25 *));
        !           148:                break;
        !           149: 
        !           150:        /* 
        !           151:         *  Initiate a disconnect to peer entity via a CLEAR REQUEST packet.
        !           152:         *  The socket will be disconnected when we receive a confirmation
        !           153:         *  or a clear collision.
        !           154:         */
        !           155:        case PRU_DISCONNECT: 
        !           156:                pk_disconnect (lcp);
        !           157:                break;
        !           158: 
        !           159:        /* 
        !           160:         *  Accept an INCOMING CALL. Most of the work has already been done
        !           161:         *  by pk_input. Just return the callers address to the user.
        !           162:         */
        !           163:        case PRU_ACCEPT: 
        !           164:                if (lcp -> lcd_craddr == NULL)
        !           165:                        break;
        !           166:                bcopy ((caddr_t)lcp -> lcd_craddr, mtod (nam, caddr_t),
        !           167:                        sizeof (struct sockaddr_x25));
        !           168:                nam -> m_len = sizeof (struct sockaddr_x25);
        !           169:                if (lcp -> lcd_flags & X25_OLDSOCKADDR)
        !           170:                        new_to_old (nam);
        !           171:                break;
        !           172: 
        !           173:        /* 
        !           174:         *  After a receive, we should send a RR.
        !           175:         */
        !           176:        case PRU_RCVD: 
        !           177:                pk_flowcontrol (lcp, /*sbspace (&so -> so_rcv) <= */ 0, 1);
        !           178:                break;
        !           179: 
        !           180:        /* 
        !           181:         *  Send INTERRUPT packet.
        !           182:         */
        !           183:        case PRU_SENDOOB: 
        !           184:                if (m == 0) {
        !           185:                        MGETHDR(m, M_WAITOK, MT_OOBDATA);
        !           186:                        m -> m_pkthdr.len = m -> m_len = 1;
        !           187:                        *mtod (m, octet *) = 0;
        !           188:                }
        !           189:                if (m -> m_pkthdr.len > 32) {
        !           190:                        m_freem (m);
        !           191:                        error = EMSGSIZE;
        !           192:                        break;
        !           193:                }
        !           194:                MCHTYPE(m, MT_OOBDATA);
        !           195:                /* FALLTHROUGH */
        !           196: 
        !           197:        /* 
        !           198:         *  Do send by placing data on the socket output queue.
        !           199:         */
        !           200:        case PRU_SEND: 
        !           201:                if (control) {
        !           202:                        register struct cmsghdr *ch = mtod (m, struct cmsghdr *);
        !           203:                        control -> m_len -= sizeof (*ch);
        !           204:                        control -> m_data += sizeof (*ch);
        !           205:                        error = pk_ctloutput (PRCO_SETOPT, so, ch -> cmsg_level,
        !           206:                                        ch -> cmsg_type, &control);
        !           207:                }
        !           208:                if (error == 0 && m)
        !           209:                        error = pk_send (lcp, m);
        !           210:                break;
        !           211: 
        !           212:        /* 
        !           213:         *  Abort a virtual circuit. For example all completed calls
        !           214:         *  waiting acceptance.
        !           215:         */
        !           216:        case PRU_ABORT: 
        !           217:                pk_disconnect (lcp);
        !           218:                break;
        !           219: 
        !           220:        /* Begin unimplemented hooks. */
        !           221: 
        !           222:        case PRU_SHUTDOWN: 
        !           223:                error = EOPNOTSUPP;
        !           224:                break;
        !           225: 
        !           226:        case PRU_CONTROL: 
        !           227:                error = EOPNOTSUPP;
        !           228:                break;
        !           229: 
        !           230:        case PRU_SENSE: 
        !           231: #ifdef BSD4_3
        !           232:                ((struct stat *)m) -> st_blksize = so -> so_snd.sb_hiwat;
        !           233: #else
        !           234:                error = EOPNOTSUPP;
        !           235: #endif
        !           236:                break;
        !           237: 
        !           238:        /* End unimplemented hooks. */
        !           239: 
        !           240:        case PRU_SOCKADDR: 
        !           241:                if (lcp -> lcd_ceaddr == 0)
        !           242:                        return (EADDRNOTAVAIL);
        !           243:                nam -> m_len = sizeof (struct sockaddr_x25);
        !           244:                bcopy ((caddr_t)lcp -> lcd_ceaddr, mtod (nam, caddr_t),
        !           245:                        sizeof (struct sockaddr_x25));
        !           246:                if (lcp -> lcd_flags & X25_OLDSOCKADDR)
        !           247:                        new_to_old (nam);
        !           248:                break;
        !           249: 
        !           250:        case PRU_PEERADDR:
        !           251:                if (lcp -> lcd_state != DATA_TRANSFER)
        !           252:                        return (ENOTCONN);
        !           253:                nam -> m_len = sizeof (struct sockaddr_x25);
        !           254:                bcopy (lcp -> lcd_craddr ? (caddr_t)lcp -> lcd_craddr :
        !           255:                        (caddr_t)lcp -> lcd_ceaddr,
        !           256:                        mtod (nam, caddr_t), sizeof (struct sockaddr_x25));
        !           257:                if (lcp -> lcd_flags & X25_OLDSOCKADDR)
        !           258:                        new_to_old (nam);
        !           259:                break;
        !           260: 
        !           261:        /* 
        !           262:         *  Receive INTERRUPT packet.
        !           263:         */
        !           264:        case PRU_RCVOOB: 
        !           265:                if (so -> so_options & SO_OOBINLINE) {
        !           266:                        register struct mbuf *n  = so -> so_rcv.sb_mb;
        !           267:                        if (n && n -> m_type == MT_OOBDATA) {
        !           268:                                unsigned len =  n -> m_pkthdr.len;
        !           269:                                so -> so_rcv.sb_mb = n -> m_nextpkt;
        !           270:                                if (len !=  n -> m_len &&
        !           271:                                    (n = m_pullup (n, len)) == 0)
        !           272:                                        break;
        !           273:                                m -> m_len = len;
        !           274:                                bcopy (mtod (m, caddr_t), mtod (n, caddr_t), len);
        !           275:                                m_freem (n);
        !           276:                        }
        !           277:                        break;
        !           278:                }
        !           279:                m -> m_len = 1;
        !           280:                *mtod (m, char *) = lcp -> lcd_intrdata;
        !           281:                break;
        !           282: 
        !           283:        default: 
        !           284:                panic ("pk_usrreq");
        !           285:        }
        !           286: release:
        !           287:        if (control != NULL)
        !           288:                m_freem (control);
        !           289:        return (error);
        !           290: }
        !           291: 
        !           292: /* 
        !           293:  * If you want to use UBC X.25 level 3 in conjunction with some
        !           294:  * other X.25 level 2 driver, have the ifp -> if_ioctl routine
        !           295:  * assign pk_start to ia -> ia_start when called with SIOCSIFCONF_X25.
        !           296:  */
        !           297: /* ARGSUSED */
        !           298: pk_start (lcp)
        !           299: register struct pklcd *lcp;
        !           300: {
        !           301:        pk_output (lcp);
        !           302:        return (0); /* XXX pk_output should return a value */
        !           303: }
        !           304: 
        !           305: #ifndef _offsetof
        !           306: #define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m))
        !           307: #endif
        !           308: struct sockaddr_x25 pk_sockmask = {
        !           309: _offsetof(struct sockaddr_x25, x25_addr[0]),
        !           310: 0, -1};
        !           311: 
        !           312: /*ARGSUSED*/
        !           313: pk_control (so, cmd, data, ifp)
        !           314: struct socket *so;
        !           315: int cmd;
        !           316: caddr_t data;
        !           317: register struct ifnet *ifp;
        !           318: {
        !           319:        register struct ifreq_x25 *ifr = (struct ifreq_x25 *)data;
        !           320:        register struct ifaddr *ifa = 0;
        !           321:        register struct x25_ifaddr *ia = 0;
        !           322:        struct pklcd *dev_lcp = 0;
        !           323:        int error, s, old_maxlcn;
        !           324:        unsigned n;
        !           325: 
        !           326:        /*
        !           327:         * Find address for this interface, if it exists.
        !           328:         */
        !           329:        if (ifp)
        !           330:                for (ifa = ifp -> if_addrlist; ifa; ifa = ifa -> ifa_next)
        !           331:                        if (ifa -> ifa_addr -> sa_family == AF_CCITT)
        !           332:                                break;
        !           333: 
        !           334:        ia = (struct x25_ifaddr *)ifa;
        !           335:        switch (cmd) {
        !           336:        case SIOCGIFCONF_X25:
        !           337:                if (ifa == 0)
        !           338:                        return (EADDRNOTAVAIL);
        !           339:                ifr -> ifr_xc = ia -> ia_xc;
        !           340:                return (0);
        !           341: 
        !           342:        case SIOCSIFCONF_X25:
        !           343:                if ((so->so_state & SS_PRIV) == 0)
        !           344:                        return (EPERM);
        !           345:                if (ifp == 0)
        !           346:                        panic ("pk_control");
        !           347:                if (ifa == (struct ifaddr *)0) {
        !           348:                        register struct mbuf *m;
        !           349: 
        !           350:                        MALLOC(ia, struct x25_ifaddr *, sizeof (*ia),
        !           351:                                M_IFADDR, M_WAITOK);
        !           352:                        if (ia == 0)
        !           353:                                return (ENOBUFS);
        !           354:                        bzero ((caddr_t)ia, sizeof (*ia));
        !           355:                        if (ifa = ifp -> if_addrlist) {
        !           356:                                for ( ; ifa -> ifa_next; ifa = ifa -> ifa_next)
        !           357:                                        ;
        !           358:                                ifa -> ifa_next = &ia -> ia_ifa;
        !           359:                        } else
        !           360:                                ifp -> if_addrlist = &ia -> ia_ifa;
        !           361:                        ifa = &ia -> ia_ifa;
        !           362:                        ifa -> ifa_netmask = (struct sockaddr *)&pk_sockmask;
        !           363:                        ifa -> ifa_addr = (struct sockaddr *)&ia -> ia_xc.xc_addr;
        !           364:                        ifa -> ifa_dstaddr = (struct sockaddr *)&ia -> ia_dstaddr; /* XXX */
        !           365:                        ia -> ia_ifp = ifp;
        !           366:                        ia -> ia_dstaddr.x25_family = AF_CCITT;
        !           367:                        ia -> ia_dstaddr.x25_len = pk_sockmask.x25_len;
        !           368:                } else {
        !           369:                        rtinit (ifa, (int)RTM_DELETE, 0);
        !           370:                }
        !           371:                old_maxlcn = ia -> ia_maxlcn;
        !           372:                ia -> ia_xc = ifr -> ifr_xc;
        !           373:                ia -> ia_dstaddr.x25_net = ia -> ia_xc.xc_addr.x25_net;
        !           374:                if (ia -> ia_maxlcn != old_maxlcn && old_maxlcn != 0) {
        !           375:                        /* VERY messy XXX */
        !           376:                        register struct pkcb *pkp;
        !           377:                        for (pkp = pkcbhead; pkp; pkp = pkp -> pk_next)
        !           378:                                if (pkp -> pk_ia == ia)
        !           379:                                        pk_resize (pkp);
        !           380:                }
        !           381:                /*
        !           382:                 * Give the interface a chance to initialize if this
        !           383:                 * is its first address, and to validate the address.
        !           384:                 */
        !           385:                ia -> ia_start = pk_start;
        !           386:                s = splimp();
        !           387:                if (ifp -> if_ioctl)
        !           388:                        error = (*ifp -> if_ioctl)(ifp, SIOCSIFCONF_X25, ifa);
        !           389:                if (error)
        !           390:                        ifp -> if_flags &= ~IFF_UP;
        !           391:                else
        !           392:                        error = rtinit (ifa, (int)RTM_ADD, RTF_UP);
        !           393:                splx (s);
        !           394:                return (error);
        !           395: 
        !           396:        default:
        !           397:                if (ifp == 0 || ifp -> if_ioctl == 0)
        !           398:                        return (EOPNOTSUPP);
        !           399:                return ((*ifp -> if_ioctl)(ifp, cmd, data));
        !           400:        }
        !           401: }
        !           402: 
        !           403: pk_ctloutput (cmd, so, level, optname, mp)
        !           404: struct socket *so;
        !           405: struct mbuf **mp;
        !           406: int cmd, level, optname;
        !           407: {
        !           408:        register struct mbuf *m = *mp;
        !           409:        register struct pklcd *lcp = (struct pklcd *) so -> so_pcb;
        !           410:        int error = EOPNOTSUPP;
        !           411: 
        !           412:        if (m == 0)
        !           413:                return (EINVAL);
        !           414:        if (cmd == PRCO_SETOPT) switch (optname) {
        !           415:        case PK_FACILITIES:
        !           416:                if (m == 0)
        !           417:                        return (EINVAL);
        !           418:                lcp -> lcd_facilities = m;
        !           419:                *mp = 0;
        !           420:                return (0);
        !           421: 
        !           422:        case PK_ACCTFILE:
        !           423:                if ((so->so_state & SS_PRIV) == 0)
        !           424:                        error = EPERM;
        !           425:                else if (m -> m_len)
        !           426:                        error = pk_accton (mtod (m, char *));
        !           427:                else
        !           428:                        error = pk_accton ((char *)0);
        !           429:                break;
        !           430: 
        !           431:        case PK_RTATTACH:
        !           432:                error = pk_rtattach (so, m);
        !           433:                break;
        !           434:            
        !           435:        case PK_PRLISTEN:
        !           436:                error = pk_user_protolisten (mtod (m, u_char *));
        !           437:        }
        !           438:        if (*mp) {
        !           439:                (void) m_freem (*mp);
        !           440:                *mp = 0;
        !           441:        }
        !           442:        return (error);
        !           443: 
        !           444: }
        !           445: 
        !           446: 
        !           447: /*
        !           448:  * Do an in-place conversion of an "old style"
        !           449:  * socket address to the new style
        !           450:  */
        !           451: 
        !           452: static
        !           453: old_to_new (m)
        !           454: register struct mbuf *m;
        !           455: {
        !           456:        register struct x25_sockaddr *oldp;
        !           457:        register struct sockaddr_x25 *newp;
        !           458:        register char *ocp, *ncp;
        !           459:        struct sockaddr_x25 new;
        !           460: 
        !           461:        oldp = mtod (m, struct x25_sockaddr *);
        !           462:        newp = &new;
        !           463:        bzero ((caddr_t)newp, sizeof (*newp));
        !           464: 
        !           465:        newp -> x25_family = AF_CCITT;
        !           466:        newp -> x25_len = sizeof(*newp);
        !           467:        newp -> x25_opts.op_flags = (oldp -> xaddr_facilities & X25_REVERSE_CHARGE)
        !           468:                | X25_MQBIT | X25_OLDSOCKADDR;
        !           469:        if (oldp -> xaddr_facilities & XS_HIPRIO)       /* Datapac specific */
        !           470:                newp -> x25_opts.op_psize = X25_PS128;
        !           471:        bcopy ((caddr_t)oldp -> xaddr_addr, newp -> x25_addr,
        !           472:               (unsigned)min (oldp -> xaddr_len, sizeof (newp -> x25_addr) - 1));
        !           473:        if (bcmp ((caddr_t)oldp -> xaddr_proto, newp -> x25_udata, 4) != 0) {
        !           474:                bcopy ((caddr_t)oldp -> xaddr_proto, newp -> x25_udata, 4);
        !           475:                newp -> x25_udlen = 4;
        !           476:        }
        !           477:        ocp = (caddr_t)oldp -> xaddr_userdata;
        !           478:        ncp = newp -> x25_udata + 4;
        !           479:        while (*ocp && ocp < (caddr_t)oldp -> xaddr_userdata + 12) {
        !           480:                if (newp -> x25_udlen == 0)
        !           481:                        newp -> x25_udlen = 4;
        !           482:                *ncp++ = *ocp++;
        !           483:                newp -> x25_udlen++;
        !           484:        }
        !           485:        bcopy ((caddr_t)newp, mtod (m, char *), sizeof (*newp));
        !           486:        m -> m_len = sizeof (*newp);
        !           487: }
        !           488: 
        !           489: /*
        !           490:  * Do an in-place conversion of a new style
        !           491:  * socket address to the old style
        !           492:  */
        !           493: 
        !           494: static
        !           495: new_to_old (m)
        !           496: register struct mbuf *m;
        !           497: {
        !           498:        register struct x25_sockaddr *oldp;
        !           499:        register struct sockaddr_x25 *newp;
        !           500:        register char *ocp, *ncp;
        !           501:        struct x25_sockaddr old;
        !           502: 
        !           503:        oldp = &old;
        !           504:        newp = mtod (m, struct sockaddr_x25 *);
        !           505:        bzero ((caddr_t)oldp, sizeof (*oldp));
        !           506: 
        !           507:        oldp -> xaddr_facilities = newp -> x25_opts.op_flags & X25_REVERSE_CHARGE;
        !           508:        if (newp -> x25_opts.op_psize == X25_PS128)
        !           509:                oldp -> xaddr_facilities |= XS_HIPRIO;  /* Datapac specific */
        !           510:        ocp = (char *)oldp -> xaddr_addr;
        !           511:        ncp = newp -> x25_addr;
        !           512:        while (*ncp) {
        !           513:                *ocp++ = *ncp++;
        !           514:                oldp -> xaddr_len++;
        !           515:        }
        !           516: 
        !           517:        bcopy (newp -> x25_udata, (caddr_t)oldp -> xaddr_proto, 4);
        !           518:        if (newp -> x25_udlen > 4)
        !           519:                bcopy (newp -> x25_udata + 4, (caddr_t)oldp -> xaddr_userdata,
        !           520:                        (unsigned)(newp -> x25_udlen - 4));
        !           521: 
        !           522:        bcopy ((caddr_t)oldp, mtod (m, char *), sizeof (*oldp));
        !           523:        m -> m_len = sizeof (*oldp);
        !           524: }
        !           525: 
        !           526: 
        !           527: pk_checksockaddr (m)
        !           528: struct mbuf *m;
        !           529: {
        !           530:        register struct sockaddr_x25 *sa = mtod (m, struct sockaddr_x25 *);
        !           531:        register char *cp;
        !           532: 
        !           533:        if (m -> m_len != sizeof (struct sockaddr_x25))
        !           534:                return (1);
        !           535:        if (sa -> x25_family != AF_CCITT ||
        !           536:                sa -> x25_udlen > sizeof (sa -> x25_udata))
        !           537:                return (1);
        !           538:        for (cp = sa -> x25_addr; *cp; cp++) {
        !           539:                if (*cp < '0' || *cp > '9' ||
        !           540:                        cp >= &sa -> x25_addr[sizeof (sa -> x25_addr) - 1])
        !           541:                        return (1);
        !           542:        }
        !           543:        return (0);
        !           544: }
        !           545: 
        !           546: pk_send (lcp, m)
        !           547: struct pklcd *lcp;
        !           548: register struct mbuf *m;
        !           549: {
        !           550:        int mqbit = 0, error = 0;
        !           551:        register struct x25_packet *xp;
        !           552:        register struct socket *so;
        !           553: 
        !           554:        if (m -> m_type == MT_OOBDATA) {
        !           555:                if (lcp -> lcd_intrconf_pending)
        !           556:                        error = ETOOMANYREFS;
        !           557:                if (m -> m_pkthdr.len > 32)
        !           558:                        error = EMSGSIZE;
        !           559:                M_PREPEND(m, PKHEADERLN, M_WAITOK);
        !           560:                if (m == 0 || error)
        !           561:                        goto bad;
        !           562:                *(mtod (m, octet *)) = 0;
        !           563:                xp = mtod (m, struct x25_packet *);
        !           564:                xp -> fmt_identifier = 1;
        !           565:                xp -> packet_type = X25_INTERRUPT;
        !           566:                SET_LCN(xp, lcp -> lcd_lcn);
        !           567:                sbinsertoob ( (so = lcp -> lcd_so) ?
        !           568:                        &so -> so_snd : &lcp -> lcd_sb, m);
        !           569:                goto send;
        !           570:        }
        !           571:        /*
        !           572:         * Application has elected (at call setup time) to prepend
        !           573:         * a control byte to each packet written indicating m-bit
        !           574:         * and q-bit status.  Examine and then discard this byte.
        !           575:         */
        !           576:        if (lcp -> lcd_flags & X25_MQBIT) {
        !           577:                if (m -> m_len < 1) {
        !           578:                        m_freem (m);
        !           579:                        return (EMSGSIZE);
        !           580:                }
        !           581:                mqbit = *(mtod (m, u_char *));
        !           582:                m -> m_len--;
        !           583:                m -> m_data++;
        !           584:                m -> m_pkthdr.len--;
        !           585:        }
        !           586:        error = pk_fragment (lcp, m, mqbit & 0x80, mqbit & 0x40, 1);
        !           587: send:
        !           588:        if (error == 0 && lcp -> lcd_state == DATA_TRANSFER)
        !           589:                lcp -> lcd_send (lcp); /* XXXXXXXXX fix pk_output!!! */
        !           590:        return (error);
        !           591: bad:
        !           592:        if (m)
        !           593:                m_freem (m);
        !           594:        return (error);
        !           595: }
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