bsd/netat/atp_misc.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 /*
  23  *      Copyright (c) 1996-1998 Apple Computer, Inc.
  24  *      All Rights Reserved.
  25  */
  26
  27 /*    Modified for MP, 1996 by Tuyen Nguyen
  28  *   Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
  29  */
  30 #include <sys/errno.h>
  31 #include <sys/types.h>
  32 #include <sys/param.h>
  33 #include <machine/spl.h>
  34 #include <sys/systm.h>
  35 #include <sys/kernel.h>
  36 #include <sys/proc.h>
  37 #include <sys/filedesc.h>
  38 #include <sys/fcntl.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/malloc.h>
  42 #include <sys/socket.h>
  43
  44 #include <netat/sysglue.h>
  45 #include <netat/appletalk.h>
  46 #include <netat/ddp.h>
  47 #include <netat/at_pcb.h>
  48 #include <netat/atp.h>
  49 #include <netat/debug.h>
  50
  51 void atp_free();
  52 void atp_send(struct atp_trans *);
  53
  54 /*
  55  *      The request timer retries a request, if all retries are used up
  56  *              it returns a NAK
  57  */
  58
  59 void
  60 atp_req_timeout(trp)
  61 register struct atp_trans *trp;
  62 {
  63         register gbuf_t *m;
  64         gref_t *gref;
  65         struct atp_state *atp;
  66         struct atp_trans *ctrp;
  67
  68         if ((atp = trp->tr_queue) == 0)
  69                 return;
  70         if (atp->atp_flags & ATP_CLOSING)
  71                 return;
  72
  73         for (ctrp = atp->atp_trans_wait.head; ctrp; ctrp = ctrp->tr_list.next) {
  74                 if (ctrp == trp)
  75                         break;
  76         }
  77         if (ctrp != trp)
  78                 return;
  79
  80         if ((m = gbuf_cont(trp->tr_xmt)) == NULL)
  81                 m = trp->tr_xmt;               /* issued via the new interface */
  82
  83         if (trp->tr_retry == 0) {
  84                 trp->tr_state = TRANS_FAILED;
  85                 if (m == trp->tr_xmt) {
  86                         trp->tr_xmt = NULL;
  87 l_notify:
  88                                 gbuf_wset(m,1);
  89                                 *gbuf_rptr(m) = 99;
  90                                 gbuf_set_type(m, MSG_DATA);
  91                                 gref = trp->tr_queue->atp_gref;
  92                                 atalk_putnext(gref, m);
  93
  94                         return;
  95                 }
  96                 dPrintf(D_M_ATP_LOW,D_L_INFO, ("atp_req_timeout: skt=%d\n",
  97                         trp->tr_local_socket));
  98                 m = trp->tr_xmt;
  99                 switch(((ioc_t *)(gbuf_rptr(trp->tr_xmt)))->ioc_cmd) {
 100                 case AT_ATP_ISSUE_REQUEST:
 101                         trp->tr_xmt = NULL;
 102                         if (trp->tr_queue->dflag)
 103                                 ((ioc_t *)gbuf_rptr(m))->ioc_cmd = AT_ATP_REQUEST_COMPLETE;
 104                         else if (trp->tr_bdsp == NULL) {
 105                                 gbuf_freem(m);
 106                                 if (trp->tr_rsp_wait)
 107                                         wakeup(&trp->tr_event);
 108                                 break;
 109                         }
 110                         atp_iocnak(trp->tr_queue, m, ETIMEDOUT);
 111                         atp_free(trp);
 112                         return;
 113
 114                 case AT_ATP_ISSUE_REQUEST_NOTE:
 115                 case AT_ATP_ISSUE_REQUEST_TICKLE:
 116                         trp->tr_xmt = gbuf_cont(m);
 117                         gbuf_cont(m) = NULL;
 118                         goto l_notify;
 119                 }
 120         } else {
 121                 (AT_ATP_HDR(m))->bitmap = trp->tr_bitmap;
 122
 123                 if (trp->tr_retry != (unsigned int) ATP_INFINITE_RETRIES)
 124                         trp->tr_retry--;
 125                 atp_send(trp);
 126         }
 127 }
 128
 129
 130 /*
 131  *      atp_free frees up a request, cleaning up the queues and freeing
 132  *              the request packet
 133  *      always called at 'lock'
 134  */
 135
 136 void atp_free(trp)
 137 register struct atp_trans *trp;
 138 {
 139         register struct atp_state *atp;
 140         register int i;
 141
 142         dPrintf(D_M_ATP_LOW, D_L_TRACE,
 143                 ("atp_free: freeing trp 0x%x\n", (u_int) trp));
 144
 145
 146         if (trp->tr_state == TRANS_ABORTING) {
 147                 ATP_Q_REMOVE(atp_trans_abort, trp, tr_list);
 148                 trp->tr_state = TRANS_DONE;
 149         }
 150         else {
 151                 if (trp->tr_tmo_func)
 152                 atp_untimout(atp_req_timeout, trp);
 153
 154                 atp = trp->tr_queue;
 155                 ATP_Q_REMOVE(atp->atp_trans_wait, trp, tr_list);
 156
 157                 if (trp->tr_xmt) {
 158                         gbuf_freem(trp->tr_xmt);
 159                         trp->tr_xmt = NULL;
 160                 }
 161                 for (i = 0; i < 8; i++) {
 162                         if (trp->tr_rcv[i]) {
 163                                 gbuf_freem(trp->tr_rcv[i]);
 164                                 trp->tr_rcv[i] = NULL;
 165                         }
 166                 }
 167                 if (trp->tr_bdsp) {
 168                         gbuf_freem(trp->tr_bdsp);
 169                         trp->tr_bdsp = NULL;
 170                 }
 171
 172                 if (trp->tr_rsp_wait) {
 173                         trp->tr_state = TRANS_ABORTING;
 174                         ATP_Q_APPEND(atp_trans_abort, trp, tr_list);
 175                         wakeup(&trp->tr_event);
 176                         return;
 177                 }
 178         }
 179
 180         atp_trans_free(trp);
 181 } /* atp_free */
 182
 183
 184 /*
 185  *      atp_send transmits a request packet by queuing it (if it isn't already) and
 186  *              scheduling the queue
 187  */
 188
 189 void atp_send(trp)
 190 register struct atp_trans *trp;
 191 {
 192         gbuf_t *m;
 193         struct atp_state *atp;
 194
 195         dPrintf(D_M_ATP_LOW, D_L_OUTPUT, ("atp_send: trp=0x%x, loc=%d\n",
 196                 (u_int) trp->tr_queue, trp->tr_local_socket));
 197
 198         if ((atp = trp->tr_queue) != 0) {
 199           if (trp->tr_state == TRANS_TIMEOUT) {
 200             if ((m = gbuf_cont(trp->tr_xmt)) == NULL)
 201                 m = trp->tr_xmt;
 202
 203             /*
 204              *  Now either release the transaction or start the timer
 205              */
 206             if (!trp->tr_retry && !trp->tr_bitmap && !trp->tr_xo) {
 207                 m = (gbuf_t *)gbuf_copym(m);
 208                 atp_x_done(trp);
 209             } else {
 210                 m = (gbuf_t *)gbuf_dupm(m);
 211
 212                 atp_timout(atp_req_timeout, trp, trp->tr_timeout);
 213             }
 214
 215             if (m) {
 216                 trace_mbufs(D_M_ATP_LOW, "  m", m);
 217                 DDP_OUTPUT(m);
 218             }
 219         }
 220   }
 221 }
 222
 223
 224 /*
 225  *      atp_reply sends all the available messages in the bitmap again
 226  *              by queueing us to the write service routine
 227  */
 228
 229 void atp_reply(rcbp)
 230 register struct atp_rcb *rcbp;
 231 {
 232         register struct atp_state *atp;
 233         register int i;
 234
 235   if ((atp = rcbp->rc_queue) != 0) {
 236         for (i = 0; i < rcbp->rc_pktcnt; i++) {
 237                 if (rcbp->rc_bitmap&atp_mask[i])
 238                         rcbp->rc_snd[i] = 1;
 239                 else
 240                         rcbp->rc_snd[i] = 0;
 241         }
 242         if (rcbp->rc_rep_waiting == 0) {
 243                 rcbp->rc_state = RCB_SENDING;
 244                 rcbp->rc_rep_waiting = 1;
 245                 atp_send_replies(atp, rcbp);
 246         }
 247   }
 248 }
 249
 250
 251 /*
 252  *      The rcb timer just frees the rcb, this happens when we missed a release for XO
 253  */
 254
 255 void atp_rcb_timer()
 256 {
 257     register struct atp_rcb *rcbp;
 258         register struct atp_rcb *next_rcbp;
 259         extern   struct atp_rcb_qhead atp_need_rel;
 260         extern struct atp_trans *trp_tmo_rcb;
 261         struct timeval timenow;
 262
 263 l_again:
 264         getmicrouptime(&timenow);
 265         for (rcbp = atp_need_rel.head; rcbp; rcbp = next_rcbp) {
 266                 next_rcbp = rcbp->rc_tlist.next;
 267
 268                 if ((timenow.tv_sec - rcbp->rc_timestamp) > 30) {
 269                         atp_rcb_free(rcbp);
 270                         goto l_again;
 271                 }
 272         }
 273         atp_timout(atp_rcb_timer, trp_tmo_rcb, 10 * HZ);
 274 }
 275
 276 atp_iocack(atp, m)
 277 struct   atp_state *atp;
 278 register gbuf_t *m;
 279 {
 280         if (gbuf_type(m) == MSG_IOCTL)
 281                 gbuf_set_type(m, MSG_IOCACK);
 282         if (gbuf_cont(m))
 283                 ((ioc_t *)gbuf_rptr(m))->ioc_count = gbuf_msgsize(gbuf_cont(m));
 284         else
 285                 ((ioc_t *)gbuf_rptr(m))->ioc_count = 0;
 286
 287         if (atp->dflag)
 288                 asp_ack_reply(atp->atp_gref, m);
 289         else
 290                 atalk_putnext(atp->atp_gref, m);
 291 }
 292
 293 atp_iocnak(atp, m, err)
 294 struct   atp_state *atp;
 295 register gbuf_t *m;
 296 register int err;
 297 {
 298         if (gbuf_type(m) == MSG_IOCTL)
 299                 gbuf_set_type(m, MSG_IOCNAK);
 300         ((ioc_t *)gbuf_rptr(m))->ioc_count = 0;
 301         ((ioc_t *)gbuf_rptr(m))->ioc_error = err ? err : ENXIO;
 302         ((ioc_t *)gbuf_rptr(m))->ioc_rval = -1;
 303         if (gbuf_cont(m)) {
 304                 gbuf_freem(gbuf_cont(m));
 305                 gbuf_cont(m) = NULL;
 306         }
 307
 308         if (atp->dflag)
 309                 asp_nak_reply(atp->atp_gref, m);
 310         else
 311                 atalk_putnext(atp->atp_gref, m);
 312 }
 313
 314 /*
 315  *      Generate a transaction id for a socket
 316  */
 317 static int lasttid;
 318 atp_tid(atp)
 319 register struct atp_state *atp;
 320 {
 321         register int i;
 322         register struct atp_trans *trp;
 323
 324         for (i = lasttid;;) {
 325                 i = (i+1)&0xffff;
 326
 327                 for (trp = atp->atp_trans_wait.head; trp; trp = trp->tr_list.next) {
 328                         if (trp->tr_tid == i)
 329                                 break;
 330                 }
 331                 if (trp == NULL) {
 332                         lasttid = i;
 333                         return(i);
 334                 }
 335         }
 336 }