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Annotation of XNU/bsd/netiso/tuba_usrreq.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1992, 1993
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  * 3. All advertising materials mentioning features or use of this software
        !            35:  *    must display the following acknowledgement:
        !            36:  *     This product includes software developed by the University of
        !            37:  *     California, Berkeley and its contributors.
        !            38:  * 4. Neither the name of the University nor the names of its contributors
        !            39:  *    may be used to endorse or promote products derived from this software
        !            40:  *    without specific prior written permission.
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            43:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            44:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            45:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            46:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            47:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            48:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            49:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            50:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            51:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            52:  * SUCH DAMAGE.
        !            53:  *
        !            54:  *     @(#)tuba_usrreq.c       8.1 (Berkeley) 6/10/93
        !            55:  */
        !            56: 
        !            57: #include <sys/param.h>
        !            58: #include <sys/systm.h>
        !            59: #include <sys/malloc.h>
        !            60: #include <sys/mbuf.h>
        !            61: #include <sys/socket.h>
        !            62: #include <sys/socketvar.h>
        !            63: #include <sys/protosw.h>
        !            64: #include <sys/errno.h>
        !            65: #include <sys/stat.h>
        !            66: 
        !            67: #include <net/if.h>
        !            68: #include <net/route.h>
        !            69: 
        !            70: #include <netinet/in.h>
        !            71: #include <netinet/in_systm.h>
        !            72: #include <netinet/ip.h>
        !            73: #include <netinet/in_pcb.h>
        !            74: #include <netinet/ip_var.h>
        !            75: #include <netinet/tcp.h>
        !            76: #include <netinet/tcp_fsm.h>
        !            77: #include <netinet/tcp_seq.h>
        !            78: #include <netinet/tcp_timer.h>
        !            79: #include <netinet/tcp_var.h>
        !            80: #include <netinet/tcpip.h>
        !            81: #include <netinet/tcp_debug.h>
        !            82: 
        !            83: #include <netiso/argo_debug.h>
        !            84: #include <netiso/iso.h>
        !            85: #include <netiso/clnp.h>
        !            86: #include <netiso/iso_pcb.h>
        !            87: #include <netiso/iso_var.h>
        !            88: #include <netiso/tuba_table.h>
        !            89: /*
        !            90:  * TCP protocol interface to socket abstraction.
        !            91:  */
        !            92: extern char *tcpstates[];
        !            93: extern struct inpcb tuba_inpcb;
        !            94: extern struct isopcb tuba_isopcb;
        !            95: 
        !            96: /*
        !            97:  * Process a TCP user request for TCP tb.  If this is a send request
        !            98:  * then m is the mbuf chain of send data.  If this is a timer expiration
        !            99:  * (called from the software clock routine), then timertype tells which timer.
        !           100:  */
        !           101: /*ARGSUSED*/
        !           102: tuba_usrreq(so, req, m, nam, control)
        !           103:        struct socket *so;
        !           104:        int req;
        !           105:        struct mbuf *m, *nam, *control;
        !           106: {
        !           107:        register struct inpcb *inp;
        !           108:        register struct isopcb *isop;
        !           109:        register struct tcpcb *tp;
        !           110:        int s;
        !           111:        int error = 0;
        !           112:        int ostate;
        !           113:        struct sockaddr_iso *siso;
        !           114: 
        !           115:        if (req == PRU_CONTROL)
        !           116:                return (iso_control(so, (int)m, (caddr_t)nam,
        !           117:                        (struct ifnet *)control));
        !           118: 
        !           119:        s = splnet();
        !           120:        inp = sotoinpcb(so);
        !           121:        /*
        !           122:         * When a TCP is attached to a socket, then there will be
        !           123:         * a (struct inpcb) pointed at by the socket, and this
        !           124:         * structure will point at a subsidary (struct tcpcb).
        !           125:         */
        !           126:        if (inp == 0  && req != PRU_ATTACH) {
        !           127:                splx(s);
        !           128:                return (EINVAL);                /* XXX */
        !           129:        }
        !           130:        if (inp) {
        !           131:                tp = intotcpcb(inp);
        !           132:                if (tp == 0)
        !           133:                        panic("tuba_usrreq");
        !           134:                ostate = tp->t_state;
        !           135:                isop = (struct isopcb *)tp->t_tuba_pcb;
        !           136:                if (isop == 0)
        !           137:                        panic("tuba_usrreq 2");
        !           138:        } else
        !           139:                ostate = 0;
        !           140:        switch (req) {
        !           141: 
        !           142:        /*
        !           143:         * TCP attaches to socket via PRU_ATTACH, reserving space,
        !           144:         * and an internet control block.  We also need to
        !           145:         * allocate an isopcb and separate the control block from
        !           146:         * tcp/ip ones.
        !           147:         */
        !           148:        case PRU_ATTACH:
        !           149:                if (error = iso_pcballoc(so, &tuba_isopcb))
        !           150:                        break;
        !           151:                isop = (struct isopcb *)so->so_pcb;
        !           152:                so->so_pcb = 0;
        !           153:                if (error = tcp_usrreq(so, req, m, nam, control)) {
        !           154:                        isop->isop_socket = 0;
        !           155:                        iso_pcbdetach(isop);
        !           156:                } else {
        !           157:                        inp = sotoinpcb(so);
        !           158:                        remque(inp);
        !           159:                        insque(inp, &tuba_inpcb);
        !           160:                        inp->inp_head = &tuba_inpcb;
        !           161:                        tp = intotcpcb(inp);
        !           162:                        if (tp == 0)
        !           163:                                panic("tuba_usrreq 3");
        !           164:                        tp->t_tuba_pcb = (caddr_t) isop;
        !           165:                }
        !           166:                goto notrace;
        !           167: 
        !           168:        /*
        !           169:         * PRU_DETACH detaches the TCP protocol from the socket.
        !           170:         * If the protocol state is non-embryonic, then can't
        !           171:         * do this directly: have to initiate a PRU_DISCONNECT,
        !           172:         * which may finish later; embryonic TCB's can just
        !           173:         * be discarded here.
        !           174:         */
        !           175:        case PRU_DETACH:
        !           176:                if (tp->t_state > TCPS_LISTEN)
        !           177:                        tp = tcp_disconnect(tp);
        !           178:                else
        !           179:                        tp = tcp_close(tp);
        !           180:                if (tp == 0)
        !           181:                        tuba_pcbdetach(isop);
        !           182:                break;
        !           183: 
        !           184:        /*
        !           185:         * Give the socket an address.
        !           186:         */
        !           187:        case PRU_BIND:
        !           188:                siso = mtod(nam, struct sockaddr_iso *);
        !           189:                if (siso->siso_tlen && siso->siso_tlen != 2) {
        !           190:                        error = EINVAL;
        !           191:                        break;
        !           192:                }
        !           193:                if ((error = iso_pcbbind(isop, nam)) || 
        !           194:                    (siso = isop->isop_laddr) == 0)
        !           195:                        break;
        !           196:                bcopy(TSEL(siso), &inp->inp_lport, 2);
        !           197:                if (siso->siso_nlen &&
        !           198:                    !(inp->inp_laddr.s_addr = tuba_lookup(siso, M_WAITOK)))
        !           199:                        error = ENOBUFS;
        !           200:                break;
        !           201: 
        !           202:        /*
        !           203:         * Prepare to accept connections.
        !           204:         */
        !           205:        case PRU_CONNECT:
        !           206:        case PRU_LISTEN:
        !           207:                if (inp->inp_lport == 0 &&
        !           208:                    (error = iso_pcbbind(isop, (struct mbuf *)0)))
        !           209:                        break;
        !           210:                bcopy(TSEL(isop->isop_laddr), &inp->inp_lport, 2);
        !           211:                if (req == PRU_LISTEN) {
        !           212:                        tp->t_state = TCPS_LISTEN;
        !           213:                        break;
        !           214:                }
        !           215:        /*FALLTHROUGH*/
        !           216:        /*
        !           217:         * Initiate connection to peer.
        !           218:         * Create a template for use in transmissions on this connection.
        !           219:         * Enter SYN_SENT state, and mark socket as connecting.
        !           220:         * Start keep-alive timer, and seed output sequence space.
        !           221:         * Send initial segment on connection.
        !           222:         */
        !           223:        /* case PRU_CONNECT: */
        !           224:                if (error = iso_pcbconnect(isop, nam))
        !           225:                        break;
        !           226:                if ((siso = isop->isop_laddr) && siso->siso_nlen > 1)
        !           227:                        siso->siso_data[siso->siso_nlen - 1] = ISOPROTO_TCP;
        !           228:                else
        !           229:                        panic("tuba_usrreq: connect");
        !           230:                siso = mtod(nam, struct sockaddr_iso *);
        !           231:                if (!(inp->inp_faddr.s_addr = tuba_lookup(siso, M_WAITOK))) {
        !           232:                unconnect:
        !           233:                        iso_pcbdisconnect(isop);
        !           234:                        error = ENOBUFS;
        !           235:                        break;
        !           236:                }
        !           237:                bcopy(TSEL(isop->isop_faddr), &inp->inp_fport, 2);
        !           238:                if (inp->inp_laddr.s_addr == 0 &&
        !           239:                     (inp->inp_laddr.s_addr = 
        !           240:                            tuba_lookup(isop->isop_laddr, M_WAITOK)) == 0)
        !           241:                        goto unconnect;
        !           242:                if ((tp->t_template = tcp_template(tp)) == 0)
        !           243:                        goto unconnect;
        !           244:                soisconnecting(so);
        !           245:                tcpstat.tcps_connattempt++;
        !           246:                tp->t_state = TCPS_SYN_SENT;
        !           247:                tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
        !           248:                tp->iss = tcp_iss; tcp_iss += TCP_ISSINCR/2;
        !           249:                tcp_sendseqinit(tp);
        !           250:                error = tcp_output(tp);
        !           251:                tuba_refcnt(isop, 1);
        !           252:                break;
        !           253: 
        !           254:        /*
        !           255:         * Initiate disconnect from peer.
        !           256:         * If connection never passed embryonic stage, just drop;
        !           257:         * else if don't need to let data drain, then can just drop anyways,
        !           258:         * else have to begin TCP shutdown process: mark socket disconnecting,
        !           259:         * drain unread data, state switch to reflect user close, and
        !           260:         * send segment (e.g. FIN) to peer.  Socket will be really disconnected
        !           261:         * when peer sends FIN and acks ours.
        !           262:         *
        !           263:         * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
        !           264:         */
        !           265:        case PRU_DISCONNECT:
        !           266:                if ((tp = tcp_disconnect(tp)) == 0)
        !           267:                        tuba_pcbdetach(isop);
        !           268:                break;
        !           269: 
        !           270:        /*
        !           271:         * Accept a connection.  Essentially all the work is
        !           272:         * done at higher levels; just return the address
        !           273:         * of the peer, storing through addr.
        !           274:         */
        !           275:        case PRU_ACCEPT:
        !           276:                bcopy((caddr_t)isop->isop_faddr, mtod(nam, caddr_t),
        !           277:                        nam->m_len = isop->isop_faddr->siso_len);
        !           278:                break;
        !           279: 
        !           280:        /*
        !           281:         * Mark the connection as being incapable of further output.
        !           282:         */
        !           283:        case PRU_SHUTDOWN:
        !           284:                socantsendmore(so);
        !           285:                tp = tcp_usrclosed(tp);
        !           286:                if (tp)
        !           287:                        error = tcp_output(tp);
        !           288:                else
        !           289:                        tuba_pcbdetach(isop);
        !           290:                break;
        !           291:        /*
        !           292:         * Abort the TCP.
        !           293:         */
        !           294:        case PRU_ABORT:
        !           295:                if ((tp = tcp_drop(tp, ECONNABORTED)) == 0)
        !           296:                        tuba_pcbdetach(isop);
        !           297:                break;
        !           298: 
        !           299: 
        !           300:        case PRU_SOCKADDR:
        !           301:                if (isop->isop_laddr)
        !           302:                        bcopy((caddr_t)isop->isop_laddr, mtod(nam, caddr_t),
        !           303:                                nam->m_len = isop->isop_laddr->siso_len);
        !           304:                break;
        !           305: 
        !           306:        case PRU_PEERADDR:
        !           307:                if (isop->isop_faddr)
        !           308:                        bcopy((caddr_t)isop->isop_faddr, mtod(nam, caddr_t),
        !           309:                                nam->m_len = isop->isop_faddr->siso_len);
        !           310:                break;
        !           311: 
        !           312:        default:
        !           313:                error = tcp_usrreq(so, req, m, nam, control);
        !           314:                goto notrace;
        !           315:        }
        !           316:        if (tp && (so->so_options & SO_DEBUG))
        !           317:                tcp_trace(TA_USER, ostate, tp, (struct tcpiphdr *)0, req);
        !           318: notrace:
        !           319:        splx(s);
        !           320:        return(error);
        !           321: }
        !           322: 
        !           323: tuba_ctloutput(op, so, level, optname, mp)
        !           324:        int op;
        !           325:        struct socket *so;
        !           326:        int level, optname;
        !           327:        struct mbuf **mp;
        !           328: {
        !           329:        int clnp_ctloutput(), tcp_ctloutput();
        !           330: 
        !           331:        return ((level != IPPROTO_TCP ? clnp_ctloutput : tcp_ctloutput)
        !           332:                        (op, so, level, optname, mp));
        !           333: }

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