bsd/netat/adsp_Open.c

   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 /* adspOpen.c v01.20
  23  *
  24  * From v01.20 08/23/90 Mike Shoemaker for MacOS
  25  *    Modified for MP, 1996 by Tuyen Nguyen
  26  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
  27  */
  28
  29 #include <sys/errno.h>
  30 #include <sys/types.h>
  31 #include <sys/param.h>
  32 #include <machine/spl.h>
  33 #include <sys/systm.h>
  34 #include <sys/kernel.h>
  35 #include <sys/proc.h>
  36 #include <sys/filedesc.h>
  37 #include <sys/fcntl.h>
  38 #include <sys/mbuf.h>
  39 #include <sys/socket.h>
  40 #include <sys/socketvar.h>
  41 #include <sys/time.h>
  42
  43 #include <netat/sysglue.h>
  44 #include <netat/appletalk.h>
  45 #include <netat/at_pcb.h>
  46 #include <netat/debug.h>
  47 #include <netat/adsp.h>
  48 #include <netat/adsp_internal.h>
  49
  50
  51 /*
  52  * NextCID
  53  *
  54  * Create a unique connection ID.
  55  *
  56  * INPUTS:
  57  *              none
  58  * OUTPUTS:
  59  *              unique connection ID
  60  */
  61 unsigned short NextCID()
  62 {
  63         unsigned short num;
  64         register CCB *queue;
  65
  66         while (1) {
  67             num = ++adspGlobal.lastCID;
  68             /* qfind_w below is in 68K assembly */
  69             /* point to the first element */
  70             queue = (CCB *)AT_ADSP_STREAMS;
  71             while (queue) {
  72                     /* and scan .. */
  73                     if (queue->locCID == num)
  74                         break;
  75                     queue = queue->ccbLink;
  76             }
  77             if (queue == (CCBPtr)NULL)
  78                 break;
  79         }
  80         return num;
  81 }
  82
  83 static  byte xlateStateTbl[4] = /* The value to be given to the CCB's state. */
  84 {                               /* indexed by ocMode */
  85         sOpening,               /* ocRequest */
  86         sPassive,               /* ocPassive */
  87         sOpening,               /* ocAccept */
  88         sOpen                   /* ocEstablish */
  89 };
  90 static  byte xlateOpenTbl[4] =  /* Value to use for open state. */
  91 {                               /* indexed by ocMode */
  92         O_STATE_OPENWAIT,       /* ocRequest */
  93         O_STATE_LISTEN,         /* ocPassive */
  94         O_STATE_ESTABLISHED,    /* ocAccept */
  95         O_STATE_OPEN            /* ocEstablish */
  96 };
  97
  98 /*
  99  * adspOpen
 100  *
 101  * INPUTS:
 102  *      -->     ccbRefNum       refnum of connection end
 103  *      -->     remoteCID       connection id of remote connection end
 104  *      -->     remoteAddress   internet address of remote connection end
 105  *      -->     filterAddress   filter for incoming open connection requests
 106  *      -->     sendSeq         initial send sequence number to use
 107  *      -->     sendWindow      initial size of remote end's receive buffer
 108  *      -->     recvSeq         initial receive sequence number to use
 109  *      -->     attnSendSeq     initial attention send sequence number
 110  *      -->     attnRecvSeq     initial receive sequence number
 111  *      -->     ocMode          connection opening mode
 112  *      -->     ocMaximum       maximum retries of open connection request
 113  *
 114  * OUTPUTS:
 115  *      <--     localCID        connection identifier of this connection end
 116  *      <--     remoteCID       connection id of remote connection end
 117  *      <--     remoteAddress
 118  *      <--     sendSeq
 119  *      <--     sendWindow
 120  *      <--     attnSendSeq
 121  *
 122  * ERRORS:
 123  *              errRefNum       bad connection refnum
 124  *              errState        connection end must be closed
 125  *              errOpening      open connection attempt failed
 126  *              errAborted      request aborted by a remove or close call
 127  */
 128 int adspOpen(sp, pb)            /* (DSPPBPtr pb) */
 129     register CCBPtr sp;
 130     register struct adspcmd *pb;
 131 {
 132     extern int adsp_pidM[];
 133
 134     int ocMode;
 135     register gbuf_t *mp;
 136
 137     if (sp == 0) {
 138         pb->ioResult = errRefNum; /* Unknown refnum */
 139         return EINVAL;
 140     }
 141
 142     if ((sp->state != sClosed) ||
 143         (sp->removing)) { /* The CCB must be closed */
 144         pb->ioResult = errState;
 145         return EALREADY;
 146     }
 147
 148     ocMode = pb->u.openParams.ocMode; /* get a local copy of open mode */
 149         if (ocMode == ocRequest)
 150                 adsp_pidM[pb->socket] = 0;
 151
 152     /*
 153      * Save parameters.  Fill in defaults if zero
 154      */
 155     if (pb->u.openParams.ocInterval)
 156         sp->openInterval = pb->u.openParams.ocInterval;
 157     else
 158         sp->openInterval = ocIntervalDefault;
 159
 160     if (pb->u.openParams.ocMaximum)
 161         sp->openRetrys = pb->u.openParams.ocMaximum;
 162     else
 163         sp->openRetrys = ocMaximumDefault;
 164
 165     sp->remoteAddress = *((AddrUnionPtr)&pb->u.openParams.remoteAddress);
 166     /* Not used for passive */
 167     /*
 168      * Clear out send/receive buffers.
 169      */
 170     if (sp->sbuf_mb) { /* clear the send queue */
 171         gbuf_freel(sp->sbuf_mb);
 172         sp->sbuf_mb = 0;
 173     }
 174     if (sp->csbuf_mb) {
 175         gbuf_freem(sp->csbuf_mb);
 176         sp->csbuf_mb = 0;
 177     }
 178     if (sp->rbuf_mb) { /* clear the receive queue */
 179         gbuf_freel(sp->rbuf_mb);
 180         sp->rbuf_mb = 0;
 181     }
 182     if (sp->crbuf_mb) {
 183         gbuf_freem(sp->crbuf_mb);
 184         sp->crbuf_mb = 0;
 185     }
 186
 187     sp->rData = 0;              /* Flag both buffers as empty */
 188     sp->sData = 0;
 189     sp->recvQPending = 0;       /* No bytes in receive queue */
 190
 191     /*
 192      * Clear all of those pesky flags
 193      */
 194     sp->userFlags = 0;
 195     sp->sendDataAck = 0;
 196     sp->sendAttnAck = 0;
 197     sp->sendAttnData = 0;
 198     sp->callSend = 0;
 199     sp->removing = 0;
 200     sp->writeFlush = 0;
 201
 202     /*
 203      * Reset round-trip timers
 204      */
 205     sp->roundTrip = sp->rtmtInterval;
 206     sp->deviation = 0;
 207
 208     /*
 209      * Reset stuff for retransmit advice packet
 210      */
 211     sp->badSeqCnt = 0;
 212     /*
 213      * Reset flow control variables
 214      */
 215     sp->pktSendMax = 1; /* Slow start says we should set this to 1 */
 216     sp->pktSendCnt = 0;
 217     sp->rbufFull = 0;
 218     sp->resentData = 0;
 219     sp->noXmitFlow = 0;
 220     sp->waitingAck = 0;
 221
 222     /*
 223      * Copy required information out of parameter block
 224      */
 225     if (ocMode == ocAccept || ocMode == ocEstablish) {
 226         sp->remCID = pb->u.openParams.remoteCID;
 227         sp->sendSeq = sp->firstRtmtSeq = pb->u.openParams.sendSeq;
 228         sp->sendWdwSeq = sp->sendSeq + pb->u.openParams.sendWindow;
 229         sp->attnSendSeq = pb->u.openParams.attnSendSeq;
 230     } else {                    /* accept or establish */
 231         sp->remCID = 0;
 232         sp->sendSeq = 0;
 233         sp->sendWdwSeq = 0;
 234         sp->attnSendSeq = 0;
 235     }
 236
 237     if (ocMode == ocEstablish) { /* Only set these if establish mode */
 238         sp->recvSeq = pb->u.openParams.recvSeq;
 239         sp->attnRecvSeq = pb->u.openParams.attnRecvSeq;
 240         UAS_ASSIGN_HTON(sp->f.CID, sp->locCID); /* Preset the CID in the ADSP header */
 241         /* This is done elsewhere for all other modes */
 242         InsertTimerElem(&adspGlobal.slowTimers, &sp->ProbeTimer,
 243                         sp->probeInterval);
 244     } else {                    /* establish */
 245         /* All other modes need a CID assigned */
 246         sp->locCID = NextCID();
 247         sp->recvSeq = 0;
 248         sp->attnRecvSeq = 0;
 249     }
 250
 251     /*
 252      * Now set the state variables for this CCB.
 253      */
 254
 255     sp->openState = xlateOpenTbl[ocMode-ocRequest];
 256     sp->state = xlateStateTbl[ocMode-ocRequest];
 257
 258     if (ocMode == ocEstablish) { /* For establish call, we're done */
 259         pb->ioResult = 0;
 260         adspioc_ack(0, pb->ioc, pb->gref);
 261         return 0;
 262     }
 263
 264     pb->qLink = 0;              /* Clear link field before putting on queue */
 265     mp = gbuf_copym(pb->mp);    /* Save parameter block to match later */
 266
 267     if (mp == 0) {
 268             pb->ioResult = errDSPQueueSize;
 269             return ENOBUFS;
 270     }
 271     pb->ioResult = 1;   /* not open -> not done */
 272     adspioc_ack(0, pb->ioc, pb->gref); /* release user */
 273     sp->opb = (struct adspcmd *)gbuf_rptr(mp);
 274     sp->opb->ioc = 0;           /* unlink saved pb from ioctl block */
 275     sp->opb->mp = mp;
 276
 277     /*
 278      * For request & accept, need to send a packet
 279      */
 280     if ((ocMode == ocRequest) || (ocMode == ocAccept)) {
 281         sp->sendCtl |= (1 << (ocMode == ocRequest ?
 282                               ADSP_CTL_OREQ : ADSP_CTL_OREQACK));
 283         CheckSend(sp);
 284     }
 285     return 0;
 286 }
 287
 288 int adspMode(pb)
 289     register struct adspcmd *pb;
 290 {
 291     return pb->u.openParams.ocMode;
 292 }