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Annotation of XNU/bsd/netiso/tp_cons.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) 1991, 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:  *     @(#)tp_cons.c   8.1 (Berkeley) 6/10/93
        !            55:  */
        !            56: 
        !            57: /***********************************************************
        !            58:                Copyright IBM Corporation 1987
        !            59: 
        !            60:                       All Rights Reserved
        !            61: 
        !            62: Permission to use, copy, modify, and distribute this software and its 
        !            63: documentation for any purpose and without fee is hereby granted, 
        !            64: provided that the above copyright notice appear in all copies and that
        !            65: both that copyright notice and this permission notice appear in 
        !            66: supporting documentation, and that the name of IBM not be
        !            67: used in advertising or publicity pertaining to distribution of the
        !            68: software without specific, written prior permission.  
        !            69: 
        !            70: IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
        !            71: ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
        !            72: IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
        !            73: ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
        !            74: WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
        !            75: ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
        !            76: SOFTWARE.
        !            77: 
        !            78: ******************************************************************/
        !            79: 
        !            80: /*
        !            81:  * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
        !            82:  */
        !            83: /* 
        !            84:  * ARGO TP
        !            85:  * Here is where you find the iso- and cons-dependent code.  We've tried
        !            86:  * keep all net-level and (primarily) address-family-dependent stuff
        !            87:  * out of the tp source, and everthing here is reached indirectly
        !            88:  * through a switch table (struct nl_protosw *) tpcb->tp_nlproto 
        !            89:  * (see tp_pcb.c). 
        !            90:  * The routines here are:
        !            91:  *     tpcons_input: pullup and call tp_input w/ correct arguments
        !            92:  *     tpcons_output: package a pkt for cons given an isopcb & some data
        !            93:  *     cons_chan_to_tpcb: find a tpcb based on the channel #
        !            94:  */
        !            95: 
        !            96: #if ISO
        !            97: #if TPCONS
        !            98: 
        !            99: #include <sys/param.h>
        !           100: #include <sys/socket.h>
        !           101: #include <sys/domain.h>
        !           102: #include <sys/mbuf.h>
        !           103: #include <sys/errno.h>
        !           104: #include <sys/time.h>
        !           105: 
        !           106: #include <net/if.h>
        !           107: #include <net/route.h>
        !           108: 
        !           109: #include <netiso/tp_param.h>
        !           110: #include <netiso/argo_debug.h>
        !           111: #include <netiso/tp_stat.h>
        !           112: #include <netiso/tp_pcb.h>
        !           113: #include <netiso/tp_trace.h>
        !           114: #include <netiso/tp_stat.h>
        !           115: #include <netiso/tp_tpdu.h>
        !           116: #include <netiso/iso.h>
        !           117: #include <netiso/iso_errno.h>
        !           118: #include <netiso/iso_pcb.h>
        !           119: #include <netiso/cons.h>
        !           120: #include <netiso/tp_seq.h>
        !           121: 
        !           122: #undef FALSE
        !           123: #undef TRUE
        !           124: #include <netccitt/x25.h>
        !           125: #include <netccitt/pk.h>
        !           126: #include <netccitt/pk_var.h>
        !           127: 
        !           128: #include <netiso/if_cons.c>
        !           129: int tpcons_output();
        !           130: 
        !           131: /*
        !           132:  * CALLED FROM:
        !           133:  *  tp_route_to() for PRU_CONNECT
        !           134:  * FUNCTION, ARGUMENTS, SIDE EFFECTS and RETURN VALUE:
        !           135:  *  version of the previous procedure for X.25
        !           136:  */
        !           137: 
        !           138: tpcons_pcbconnect(isop, nam)
        !           139: struct isopcb *isop;
        !           140: register struct mbuf *nam;
        !           141: {
        !           142:        int error;
        !           143:        if (error = iso_pcbconnect(isop, nam))
        !           144:                return error;
        !           145:        if ((isop->isop_chan = (caddr_t) pk_attach((struct socket *)0)) == 0) {
        !           146:                IFDEBUG(D_CCONS)
        !           147:                        printf("tpcons_pcbconnect: no pklcd; returns 0x%x\n", error);
        !           148:                ENDDEBUG
        !           149:                return ENOBUFS;
        !           150:        }
        !           151:        if (error = cons_connect(isop)) { /* if it doesn't work */
        !           152:                /* oh, dear, throw packet away */
        !           153:                pk_disconnect((struct pklcd *)isop->isop_chan);
        !           154:                isop->isop_chan = 0;
        !           155:        } else 
        !           156:                isop->isop_refcnt = 1;
        !           157:        return error;
        !           158: }
        !           159: 
        !           160: 
        !           161: /*
        !           162:  * CALLED FROM:
        !           163:  *     cons
        !           164:  * FUNCTION and ARGUMENTS:
        !           165:  * THIS MAYBE BELONGS IN SOME OTHER PLACE??? but i think not -
        !           166:  */
        !           167: ProtoHook
        !           168: tpcons_ctlinput(cmd, siso, isop)
        !           169:        int cmd; 
        !           170:        struct sockaddr_iso *siso;
        !           171:        struct isopcb *isop;
        !           172: {
        !           173:        register struct tp_pcb *tpcb = 0;
        !           174: 
        !           175:        if (isop->isop_socket)
        !           176:                tpcb = (struct tp_pcb *)isop->isop_socket->so_pcb;
        !           177:        switch (cmd) {
        !           178: 
        !           179:        case PRC_CONS_SEND_DONE:
        !           180:                if (tpcb) {
        !           181:                        struct  tp_event                E;
        !           182:                        int                                     error = 0;
        !           183: 
        !           184:                        if (tpcb->tp_class == TP_CLASS_0) {
        !           185:                                /* only if class is exactly class zero, not
        !           186:                                 * still in class negotiation
        !           187:                                 */
        !           188:                                /* fake an ack */
        !           189:                                register SeqNum seq =  SEQ_ADD(tpcb, tpcb->tp_snduna, 1);
        !           190: 
        !           191:                                IFTRACE(D_DATA)
        !           192:                                        tptrace(TPPTmisc, "FAKE ACK seq cdt 1", 
        !           193:                                                seq, 0,0,0);
        !           194:                                ENDTRACE
        !           195:                                IFDEBUG(D_DATA)
        !           196:                                        printf("FAKE ACK seq 0x%x cdt 1\n", seq );
        !           197:                                ENDDEBUG
        !           198:                                E.ATTR(AK_TPDU).e_cdt = 1;
        !           199:                                E.ATTR(AK_TPDU).e_seq = seq;
        !           200:                                E.ATTR(AK_TPDU).e_subseq = 0;
        !           201:                                E.ATTR(AK_TPDU).e_fcc_present = 0;
        !           202:                                error =  DoEvent(AK_TPDU);
        !           203:                                if( error ) {
        !           204:                                        tpcb->tp_sock->so_error = error;
        !           205:                                }
        !           206:                        } /* else ignore it */
        !           207:                }
        !           208:                break;
        !           209:        case PRC_ROUTEDEAD:
        !           210:                if (tpcb && tpcb->tp_class == TP_CLASS_0) {
        !           211:                        tpiso_reset(isop);
        !           212:                        break;
        !           213:                } /* else drop through */
        !           214:        default:
        !           215:                (void) tpclnp_ctlinput(cmd, siso);
        !           216:                break;
        !           217:        }
        !           218:        return 0;
        !           219: }
        !           220: 
        !           221: /*
        !           222:  * CALLED FROM:
        !           223:  *     cons's intr routine
        !           224:  * FUNCTION and ARGUMENTS:
        !           225:  * Take a packet (m) from cons, pullup m as required by tp,
        !           226:  *  ignore the socket argument, and call tp_input. 
        !           227:  * No return value.  
        !           228:  */
        !           229: ProtoHook
        !           230: tpcons_input(m, faddr, laddr, channel)
        !           231:        struct mbuf             *m;
        !           232:        struct sockaddr_iso     *faddr, *laddr;
        !           233:        caddr_t                         channel;
        !           234: {
        !           235:        if( m == MNULL)
        !           236:                return 0;
        !           237: 
        !           238:        m = (struct mbuf *)tp_inputprep(m);
        !           239: 
        !           240:        IFDEBUG(D_TPINPUT)
        !           241:                printf("tpcons_input before tp_input(m 0x%x)\n", m);
        !           242:                dump_buf( m, 12+ m->m_len);
        !           243:        ENDDEBUG
        !           244:        tp_input(m, faddr, laddr, channel, tpcons_output, 0);
        !           245:        return 0;
        !           246: }
        !           247: 
        !           248: 
        !           249: /*
        !           250:  * CALLED FROM:
        !           251:  *  tp_emit()
        !           252:  * FUNCTION and ARGUMENTS:
        !           253:  *  Take a packet(m0) from tp and package it so that cons will accept it.
        !           254:  *  This means filling in a few of the fields.
        !           255:  *  inp is the isopcb structure; datalen is the length of the data in the
        !           256:  *  mbuf string m0.
        !           257:  * RETURN VALUE:
        !           258:  *  whatever (E*) is returned form the net layer output routine.
        !           259:  */
        !           260: 
        !           261: int
        !           262: tpcons_output(isop, m0, datalen, nochksum)
        !           263:        struct isopcb           *isop;
        !           264:        struct mbuf             *m0;
        !           265:        int                             datalen;
        !           266:        int                                     nochksum;
        !           267: {
        !           268:        register        struct mbuf *m = m0;
        !           269:        int                                     error;
        !           270: 
        !           271:        IFDEBUG(D_EMIT)
        !           272:                printf(
        !           273:                "tpcons_output(isop 0x%x, m 0x%x, len 0x%x socket 0x%x\n",
        !           274:                        isop, m0, datalen, isop->isop_socket);
        !           275:        ENDDEBUG
        !           276:        if (m == MNULL)
        !           277:                return 0;
        !           278:        if ((m->m_flags & M_PKTHDR) == 0) {
        !           279:                MGETHDR(m, M_DONTWAIT, MT_DATA);
        !           280:                if (m == 0)
        !           281:                        return ENOBUFS;
        !           282:                m->m_next = m0;
        !           283:        }
        !           284:        m->m_pkthdr.len = datalen;
        !           285:        if (isop->isop_chan == 0) {
        !           286:                /* got a restart maybe? */
        !           287:                if ((isop->isop_chan = (caddr_t) pk_attach((struct socket *)0)) == 0) {
        !           288:                        IFDEBUG(D_CCONS)
        !           289:                                printf("tpcons_output: no pklcd\n");
        !           290:                        ENDDEBUG
        !           291:                        error = ENOBUFS;
        !           292:                }
        !           293:                if (error = cons_connect(isop)) {
        !           294:                        pk_disconnect((struct pklcd *)isop->isop_chan);
        !           295:                        isop->isop_chan = 0;
        !           296:                        IFDEBUG(D_CCONS)
        !           297:                                printf("tpcons_output: can't reconnect\n");
        !           298:                        ENDDEBUG
        !           299:                }
        !           300:        } else {
        !           301:                error = pk_send(isop->isop_chan, m);
        !           302:                IncStat(ts_tpdu_sent);
        !           303:        }
        !           304:        return error;
        !           305: }
        !           306: /*
        !           307:  * CALLED FROM:
        !           308:  *  tp_error_emit()
        !           309:  * FUNCTION and ARGUMENTS:
        !           310:  *  Take a packet(m0) from tp and package it so that cons will accept it.
        !           311:  *  chan is the cons channel to use; datalen is the length of the data in the
        !           312:  *  mbuf string m0.
        !           313:  * RETURN VALUE:
        !           314:  *  whatever (E*) is returned form the net layer output routine.
        !           315:  */
        !           316: 
        !           317: int
        !           318: tpcons_dg_output(chan, m0, datalen)
        !           319:        caddr_t                         chan;
        !           320:        struct mbuf             *m0;
        !           321:        int                             datalen;
        !           322: {
        !           323:        return tpcons_output(((struct pklcd *)chan)->lcd_upnext, m0, datalen, 0);
        !           324: }
        !           325: #endif /* TPCONS */
        !           326: #endif /* ISO */

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