bsd/netat/adsp_Open.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_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 License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /* adspOpen.c v01.20
  29  *
  30  * From v01.20 08/23/90 Mike Shoemaker for MacOS
  31  *    Modified for MP, 1996 by Tuyen Nguyen
  32  *   Modified, April 9, 1997 by Tuyen Nguyen for MacOSX.
  33  */
  34
  35 #include <sys/errno.h>
  36 #include <sys/types.h>
  37 #include <sys/param.h>
  38 #include <machine/spl.h>
  39 #include <sys/systm.h>
  40 #include <sys/kernel.h>
  41 #include <sys/proc.h>
  42 #include <sys/filedesc.h>
  43 #include <sys/fcntl.h>
  44 #include <sys/mbuf.h>
  45 #include <sys/socket.h>
  46 #include <sys/socketvar.h>
  47 #include <sys/time.h>
  48
  49 #include <netat/sysglue.h>
  50 #include <netat/appletalk.h>
  51 #include <netat/at_pcb.h>
  52 #include <netat/debug.h>
  53 #include <netat/adsp.h>
  54 #include <netat/adsp_internal.h>
  55
  56 extern atlock_t adspgen_lock;
  57
  58 /*
  59  * NextCID
  60  *
  61  * Create a unique connection ID.
  62  *
  63  * INPUTS:
  64  *              none
  65  * OUTPUTS:
  66  *              unique connection ID
  67  */
  68 unsigned short NextCID()
  69 {
  70         int s;
  71         unsigned short num;
  72         register CCB *queue;
  73
  74         while (1) {
  75             ATDISABLE(s, adspgen_lock);         /* Disable interrupts */
  76             num = ++adspGlobal.lastCID;
  77             /* qfind_w below is in 68K assembly */
  78             /* point to the first element */
  79             queue = (CCB *)AT_ADSP_STREAMS;
  80             while (queue) {
  81                     /* and scan .. */
  82                     if (queue->locCID == num)
  83                         break;
  84                     queue = queue->ccbLink;
  85             }
  86             ATENABLE(s, adspgen_lock);
  87             if (queue == (CCBPtr)NULL)
  88                 break;
  89         }
  90         return num;
  91 }
  92
  93 static  byte xlateStateTbl[4] = /* The value to be given to the CCB's state. */
  94 {                               /* indexed by ocMode */
  95         sOpening,               /* ocRequest */
  96         sPassive,               /* ocPassive */
  97         sOpening,               /* ocAccept */
  98         sOpen                   /* ocEstablish */
  99 };
 100 static  byte xlateOpenTbl[4] =  /* Value to use for open state. */
 101 {                               /* indexed by ocMode */
 102         O_STATE_OPENWAIT,       /* ocRequest */
 103         O_STATE_LISTEN,         /* ocPassive */
 104         O_STATE_ESTABLISHED,    /* ocAccept */
 105         O_STATE_OPEN            /* ocEstablish */
 106 };
 107
 108 /*
 109  * adspOpen
 110  *
 111  * INPUTS:
 112  *      -->     ccbRefNum       refnum of connection end
 113  *      -->     remoteCID       connection id of remote connection end
 114  *      -->     remoteAddress   internet address of remote connection end
 115  *      -->     filterAddress   filter for incoming open connection requests
 116  *      -->     sendSeq         initial send sequence number to use
 117  *      -->     sendWindow      initial size of remote end's receive buffer
 118  *      -->     recvSeq         initial receive sequence number to use
 119  *      -->     attnSendSeq     initial attention send sequence number
 120  *      -->     attnRecvSeq     initial receive sequence number
 121  *      -->     ocMode          connection opening mode
 122  *      -->     ocMaximum       maximum retries of open connection request
 123  *
 124  * OUTPUTS:
 125  *      <--     localCID        connection identifier of this connection end
 126  *      <--     remoteCID       connection id of remote connection end
 127  *      <--     remoteAddress
 128  *      <--     sendSeq
 129  *      <--     sendWindow
 130  *      <--     attnSendSeq
 131  *
 132  * ERRORS:
 133  *              errRefNum       bad connection refnum
 134  *              errState        connection end must be closed
 135  *              errOpening      open connection attempt failed
 136  *              errAborted      request aborted by a remove or close call
 137  */
 138 int adspOpen(sp, pb)            /* (DSPPBPtr pb) */
 139     register CCBPtr sp;
 140     register struct adspcmd *pb;
 141 {
 142     extern int adsp_pidM[];
 143
 144     int ocMode;
 145     register gbuf_t *mp;
 146
 147     if (sp == 0) {
 148         pb->ioResult = errRefNum; /* Unknown refnum */
 149         return EINVAL;
 150     }
 151
 152     if ((sp->state != sClosed) ||
 153         (sp->removing)) { /* The CCB must be closed */
 154         pb->ioResult = errState;
 155         return EALREADY;
 156     }
 157
 158     ocMode = pb->u.openParams.ocMode; /* get a local copy of open mode */
 159         if (ocMode == ocRequest)
 160                 adsp_pidM[pb->socket] = 0;
 161
 162     /*
 163      * Save parameters.  Fill in defaults if zero
 164      */
 165     if (pb->u.openParams.ocInterval)
 166         sp->openInterval = pb->u.openParams.ocInterval;
 167     else
 168         sp->openInterval = ocIntervalDefault;
 169
 170     if (pb->u.openParams.ocMaximum)
 171         sp->openRetrys = pb->u.openParams.ocMaximum;
 172     else
 173         sp->openRetrys = ocMaximumDefault;
 174
 175     sp->remoteAddress = *((AddrUnionPtr)&pb->u.openParams.remoteAddress);
 176     /* Not used for passive */
 177     /*
 178      * Clear out send/receive buffers.
 179      */
 180     if (sp->sbuf_mb) { /* clear the send queue */
 181         gbuf_freel(sp->sbuf_mb);
 182         sp->sbuf_mb = 0;
 183     }
 184     if (sp->csbuf_mb) {
 185         gbuf_freem(sp->csbuf_mb);
 186         sp->csbuf_mb = 0;
 187     }
 188     if (sp->rbuf_mb) { /* clear the receive queue */
 189         gbuf_freel(sp->rbuf_mb);
 190         sp->rbuf_mb = 0;
 191     }
 192     if (sp->crbuf_mb) {
 193         gbuf_freem(sp->crbuf_mb);
 194         sp->crbuf_mb = 0;
 195     }
 196
 197     sp->rData = 0;              /* Flag both buffers as empty */
 198     sp->sData = 0;
 199     sp->recvQPending = 0;       /* No bytes in receive queue */
 200
 201     /*
 202      * Clear all of those pesky flags
 203      */
 204     sp->userFlags = 0;
 205     sp->sendDataAck = 0;
 206     sp->sendAttnAck = 0;
 207     sp->sendAttnData = 0;
 208     sp->callSend = 0;
 209     sp->removing = 0;
 210     sp->writeFlush = 0;
 211
 212     /*
 213      * Reset round-trip timers
 214      */
 215     sp->roundTrip = sp->rtmtInterval;
 216     sp->deviation = 0;
 217
 218     /*
 219      * Reset stuff for retransmit advice packet
 220      */
 221     sp->badSeqCnt = 0;
 222     /*
 223      * Reset flow control variables
 224      */
 225     sp->pktSendMax = 1; /* Slow start says we should set this to 1 */
 226     sp->pktSendCnt = 0;
 227     sp->rbufFull = 0;
 228     sp->resentData = 0;
 229     sp->noXmitFlow = 0;
 230     sp->waitingAck = 0;
 231
 232     /*
 233      * Copy required information out of parameter block
 234      */
 235     if (ocMode == ocAccept || ocMode == ocEstablish) {
 236         sp->remCID = pb->u.openParams.remoteCID;
 237         sp->sendSeq = sp->firstRtmtSeq = pb->u.openParams.sendSeq;
 238         sp->sendWdwSeq = sp->sendSeq + pb->u.openParams.sendWindow;
 239         sp->attnSendSeq = pb->u.openParams.attnSendSeq;
 240     } else {                    /* accept or establish */
 241         sp->remCID = 0;
 242         sp->sendSeq = 0;
 243         sp->sendWdwSeq = 0;
 244         sp->attnSendSeq = 0;
 245     }
 246
 247     if (ocMode == ocEstablish) { /* Only set these if establish mode */
 248         sp->recvSeq = pb->u.openParams.recvSeq;
 249         sp->attnRecvSeq = pb->u.openParams.attnRecvSeq;
 250         UAS_ASSIGN(sp->f.CID, sp->locCID); /* Preset the CID in the ADSP header */
 251         /* This is done elsewhere for all other modes */
 252         InsertTimerElem(&adspGlobal.slowTimers, &sp->ProbeTimer,
 253                         sp->probeInterval);
 254     } else {                    /* establish */
 255         /* All other modes need a CID assigned */
 256         sp->locCID = NextCID();
 257         sp->recvSeq = 0;
 258         sp->attnRecvSeq = 0;
 259     }
 260
 261     /*
 262      * Now set the state variables for this CCB.
 263      */
 264
 265     sp->openState = xlateOpenTbl[ocMode-ocRequest];
 266     sp->state = xlateStateTbl[ocMode-ocRequest];
 267
 268     if (ocMode == ocEstablish) { /* For establish call, we're done */
 269         pb->ioResult = 0;
 270         adspioc_ack(0, pb->ioc, pb->gref);
 271         return 0;
 272     }
 273
 274     pb->qLink = 0;              /* Clear link field before putting on queue */
 275     mp = gbuf_copym(pb->mp);    /* Save parameter block to match later */
 276
 277     if (mp == 0) {
 278             pb->ioResult = errDSPQueueSize;
 279             return ENOBUFS;
 280     }
 281     pb->ioResult = 1;   /* not open -> not done */
 282     adspioc_ack(0, pb->ioc, pb->gref); /* release user */
 283     sp->opb = (struct adspcmd *)gbuf_rptr(mp);
 284     sp->opb->ioc = 0;           /* unlink saved pb from ioctl block */
 285     sp->opb->mp = mp;
 286
 287     /*
 288      * For request & accept, need to send a packet
 289      */
 290     if ((ocMode == ocRequest) || (ocMode == ocAccept)) {
 291         sp->sendCtl |= (1 << (ocMode == ocRequest ?
 292                               ADSP_CTL_OREQ : ADSP_CTL_OREQACK));
 293         CheckSend(sp);
 294     }
 295     return 0;
 296 }
 297
 298 int adspMode(pb)
 299     register struct adspcmd *pb;
 300 {
 301     return pb->u.openParams.ocMode;
 302 }