bsd/netat/adsp_Open.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /* adspOpen.c v01.20
  31  *
  32  * From v01.20 08/23/90 Mike Shoemaker for MacOS
  33  *    Modified for MP, 1996 by Tuyen Nguyen
  34  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
  35  */
  36
  37 #include <sys/errno.h>
  38 #include <sys/types.h>
  39 #include <sys/param.h>
  40 #include <machine/spl.h>
  41 #include <sys/systm.h>
  42 #include <sys/kernel.h>
  43 #include <sys/proc.h>
  44 #include <sys/filedesc.h>
  45 #include <sys/fcntl.h>
  46 #include <sys/mbuf.h>
  47 #include <sys/socket.h>
  48 #include <sys/socketvar.h>
  49 #include <sys/time.h>
  50
  51 #include <netat/sysglue.h>
  52 #include <netat/appletalk.h>
  53 #include <netat/at_pcb.h>
  54 #include <netat/debug.h>
  55 #include <netat/adsp.h>
  56 #include <netat/adsp_internal.h>
  57
  58
  59 /*
  60  * NextCID
  61  *
  62  * Create a unique connection ID.
  63  *
  64  * INPUTS:
  65  *              none
  66  * OUTPUTS:
  67  *              unique connection ID
  68  */
  69 unsigned short NextCID()
  70 {
  71         unsigned short num;
  72         register CCB *queue;
  73
  74         while (1) {
  75             num = ++adspGlobal.lastCID;
  76             /* qfind_w below is in 68K assembly */
  77             /* point to the first element */
  78             queue = (CCB *)AT_ADSP_STREAMS;
  79             while (queue) {
  80                     /* and scan .. */
  81                     if (queue->locCID == num)
  82                         break;
  83                     queue = queue->ccbLink;
  84             }
  85             if (queue == (CCBPtr)NULL)
  86                 break;
  87         }
  88         return num;
  89 }
  90
  91 static  byte xlateStateTbl[4] = /* The value to be given to the CCB's state. */
  92 {                               /* indexed by ocMode */
  93         sOpening,               /* ocRequest */
  94         sPassive,               /* ocPassive */
  95         sOpening,               /* ocAccept */
  96         sOpen                   /* ocEstablish */
  97 };
  98 static  byte xlateOpenTbl[4] =  /* Value to use for open state. */
  99 {                               /* indexed by ocMode */
 100         O_STATE_OPENWAIT,       /* ocRequest */
 101         O_STATE_LISTEN,         /* ocPassive */
 102         O_STATE_ESTABLISHED,    /* ocAccept */
 103         O_STATE_OPEN            /* ocEstablish */
 104 };
 105
 106 /*
 107  * adspOpen
 108  *
 109  * INPUTS:
 110  *      -->     ccbRefNum       refnum of connection end
 111  *      -->     remoteCID       connection id of remote connection end
 112  *      -->     remoteAddress   internet address of remote connection end
 113  *      -->     filterAddress   filter for incoming open connection requests
 114  *      -->     sendSeq         initial send sequence number to use
 115  *      -->     sendWindow      initial size of remote end's receive buffer
 116  *      -->     recvSeq         initial receive sequence number to use
 117  *      -->     attnSendSeq     initial attention send sequence number
 118  *      -->     attnRecvSeq     initial receive sequence number
 119  *      -->     ocMode          connection opening mode
 120  *      -->     ocMaximum       maximum retries of open connection request
 121  *
 122  * OUTPUTS:
 123  *      <--     localCID        connection identifier of this connection end
 124  *      <--     remoteCID       connection id of remote connection end
 125  *      <--     remoteAddress
 126  *      <--     sendSeq
 127  *      <--     sendWindow
 128  *      <--     attnSendSeq
 129  *
 130  * ERRORS:
 131  *              errRefNum       bad connection refnum
 132  *              errState        connection end must be closed
 133  *              errOpening      open connection attempt failed
 134  *              errAborted      request aborted by a remove or close call
 135  */
 136 int adspOpen(sp, pb)            /* (DSPPBPtr pb) */
 137     register CCBPtr sp;
 138     register struct adspcmd *pb;
 139 {
 140     extern int adsp_pidM[];
 141
 142     int ocMode;
 143     register gbuf_t *mp;
 144
 145     if (sp == 0) {
 146         pb->ioResult = errRefNum; /* Unknown refnum */
 147         return EINVAL;
 148     }
 149
 150     if ((sp->state != sClosed) ||
 151         (sp->removing)) { /* The CCB must be closed */
 152         pb->ioResult = errState;
 153         return EALREADY;
 154     }
 155
 156     ocMode = pb->u.openParams.ocMode; /* get a local copy of open mode */
 157         if (ocMode == ocRequest)
 158                 adsp_pidM[pb->socket] = 0;
 159
 160     /*
 161      * Save parameters.  Fill in defaults if zero
 162      */
 163     if (pb->u.openParams.ocInterval)
 164         sp->openInterval = pb->u.openParams.ocInterval;
 165     else
 166         sp->openInterval = ocIntervalDefault;
 167
 168     if (pb->u.openParams.ocMaximum)
 169         sp->openRetrys = pb->u.openParams.ocMaximum;
 170     else
 171         sp->openRetrys = ocMaximumDefault;
 172
 173     sp->remoteAddress = *((AddrUnionPtr)&pb->u.openParams.remoteAddress);
 174     /* Not used for passive */
 175     /*
 176      * Clear out send/receive buffers.
 177      */
 178     if (sp->sbuf_mb) { /* clear the send queue */
 179         gbuf_freel(sp->sbuf_mb);
 180         sp->sbuf_mb = 0;
 181     }
 182     if (sp->csbuf_mb) {
 183         gbuf_freem(sp->csbuf_mb);
 184         sp->csbuf_mb = 0;
 185     }
 186     if (sp->rbuf_mb) { /* clear the receive queue */
 187         gbuf_freel(sp->rbuf_mb);
 188         sp->rbuf_mb = 0;
 189     }
 190     if (sp->crbuf_mb) {
 191         gbuf_freem(sp->crbuf_mb);
 192         sp->crbuf_mb = 0;
 193     }
 194
 195     sp->rData = 0;              /* Flag both buffers as empty */
 196     sp->sData = 0;
 197     sp->recvQPending = 0;       /* No bytes in receive queue */
 198
 199     /*
 200      * Clear all of those pesky flags
 201      */
 202     sp->userFlags = 0;
 203     sp->sendDataAck = 0;
 204     sp->sendAttnAck = 0;
 205     sp->sendAttnData = 0;
 206     sp->callSend = 0;
 207     sp->removing = 0;
 208     sp->writeFlush = 0;
 209
 210     /*
 211      * Reset round-trip timers
 212      */
 213     sp->roundTrip = sp->rtmtInterval;
 214     sp->deviation = 0;
 215
 216     /*
 217      * Reset stuff for retransmit advice packet
 218      */
 219     sp->badSeqCnt = 0;
 220     /*
 221      * Reset flow control variables
 222      */
 223     sp->pktSendMax = 1; /* Slow start says we should set this to 1 */
 224     sp->pktSendCnt = 0;
 225     sp->rbufFull = 0;
 226     sp->resentData = 0;
 227     sp->noXmitFlow = 0;
 228     sp->waitingAck = 0;
 229
 230     /*
 231      * Copy required information out of parameter block
 232      */
 233     if (ocMode == ocAccept || ocMode == ocEstablish) {
 234         sp->remCID = pb->u.openParams.remoteCID;
 235         sp->sendSeq = sp->firstRtmtSeq = pb->u.openParams.sendSeq;
 236         sp->sendWdwSeq = sp->sendSeq + pb->u.openParams.sendWindow;
 237         sp->attnSendSeq = pb->u.openParams.attnSendSeq;
 238     } else {                    /* accept or establish */
 239         sp->remCID = 0;
 240         sp->sendSeq = 0;
 241         sp->sendWdwSeq = 0;
 242         sp->attnSendSeq = 0;
 243     }
 244
 245     if (ocMode == ocEstablish) { /* Only set these if establish mode */
 246         sp->recvSeq = pb->u.openParams.recvSeq;
 247         sp->attnRecvSeq = pb->u.openParams.attnRecvSeq;
 248         UAS_ASSIGN_HTON(sp->f.CID, sp->locCID); /* Preset the CID in the ADSP header */
 249         /* This is done elsewhere for all other modes */
 250         InsertTimerElem(&adspGlobal.slowTimers, &sp->ProbeTimer,
 251                         sp->probeInterval);
 252     } else {                    /* establish */
 253         /* All other modes need a CID assigned */
 254         sp->locCID = NextCID();
 255         sp->recvSeq = 0;
 256         sp->attnRecvSeq = 0;
 257     }
 258
 259     /*
 260      * Now set the state variables for this CCB.
 261      */
 262
 263     sp->openState = xlateOpenTbl[ocMode-ocRequest];
 264     sp->state = xlateStateTbl[ocMode-ocRequest];
 265
 266     if (ocMode == ocEstablish) { /* For establish call, we're done */
 267         pb->ioResult = 0;
 268         adspioc_ack(0, pb->ioc, pb->gref);
 269         return 0;
 270     }
 271
 272     pb->qLink = 0;              /* Clear link field before putting on queue */
 273     mp = gbuf_copym(pb->mp);    /* Save parameter block to match later */
 274
 275     if (mp == 0) {
 276             pb->ioResult = errDSPQueueSize;
 277             return ENOBUFS;
 278     }
 279     pb->ioResult = 1;   /* not open -> not done */
 280     adspioc_ack(0, pb->ioc, pb->gref); /* release user */
 281     sp->opb = (struct adspcmd *)gbuf_rptr(mp);
 282     sp->opb->ioc = 0;           /* unlink saved pb from ioctl block */
 283     sp->opb->mp = mp;
 284
 285     /*
 286      * For request & accept, need to send a packet
 287      */
 288     if ((ocMode == ocRequest) || (ocMode == ocAccept)) {
 289         sp->sendCtl |= (1 << (ocMode == ocRequest ?
 290                               ADSP_CTL_OREQ : ADSP_CTL_OREQACK));
 291         CheckSend(sp);
 292     }
 293     return 0;
 294 }
 295
 296 int adspMode(pb)
 297     register struct adspcmd *pb;
 298 {
 299     return pb->u.openParams.ocMode;
 300 }