usr/src/lib/libc/port/nsl/t_sndudata.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22
  23 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  24 /*        All Rights Reserved   */
  25
  26 /*
  27  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"        /* SVr4.0 1.5 */
  32
  33 /*
  34  * t_sndudata.c and t_sndvudata.c are very similar and contain common code.
  35  * Any changes to either of them should be reviewed to see whether they
  36  * are applicable to the other file.
  37  */
  38 #include "mt.h"
  39 #include <stdlib.h>
  40 #include <errno.h>
  41 #include <stropts.h>
  42 #include <sys/stream.h>
  43 #define _SUN_TPI_VERSION 2
  44 #include <sys/tihdr.h>
  45 #include <sys/timod.h>
  46 #include <xti.h>
  47 #include <syslog.h>
  48 #include "tx.h"
  49
  50 int
  51 _tx_sndudata(int fd, const struct t_unitdata *unitdata, int api_semantics)
  52 {
  53         struct T_unitdata_req *udreq;
  54         struct strbuf ctlbuf;
  55         int size;
  56         struct _ti_user *tiptr;
  57         int sv_errno;
  58         int didalloc;
  59
  60         if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
  61                 return (-1);
  62         sig_mutex_lock(&tiptr->ti_lock);
  63
  64         if (tiptr->ti_servtype != T_CLTS) {
  65                 t_errno = TNOTSUPPORT;
  66                 sig_mutex_unlock(&tiptr->ti_lock);
  67                 return (-1);
  68         }
  69
  70         if (_T_IS_XTI(api_semantics)) {
  71                 /*
  72                  * User level state verification only done for XTI
  73                  * because doing for TLI may break existing applications
  74                  */
  75                 if (tiptr->ti_state != T_IDLE) {
  76                         t_errno = TOUTSTATE;
  77                         sig_mutex_unlock(&tiptr->ti_lock);
  78                         return (-1);
  79                 }
  80         }
  81
  82         if (((int)unitdata->udata.len == 0) &&
  83             !(tiptr->ti_prov_flag & (SENDZERO|OLD_SENDZERO))) {
  84                 t_errno = TBADDATA;
  85                 sig_mutex_unlock(&tiptr->ti_lock);
  86                 return (-1);
  87         }
  88
  89         if ((tiptr->ti_maxpsz > 0) &&
  90             (unitdata->udata.len > (uint32_t)tiptr->ti_maxpsz)) {
  91                 if (_T_IS_TLI(api_semantics)) {
  92                         t_errno = TSYSERR;
  93                         errno = EPROTO;
  94                 } else
  95                         t_errno = TBADDATA;
  96                 sv_errno = errno;
  97                 sig_mutex_unlock(&tiptr->ti_lock);
  98                 errno = sv_errno;
  99                 return (-1);
 100         }
 101
 102         /*
 103          * Acquire ctlbuf for use in sending/receiving control part
 104          * of the message.
 105          */
 106         if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
 107                 sv_errno = errno;
 108                 sig_mutex_unlock(&tiptr->ti_lock);
 109                 errno = sv_errno;
 110                 return (-1);
 111         }
 112
 113         /* LINTED pointer cast */
 114         udreq = (struct T_unitdata_req *)ctlbuf.buf;
 115
 116         udreq->PRIM_type = T_UNITDATA_REQ;
 117         udreq->DEST_length = unitdata->addr.len;
 118         udreq->DEST_offset = 0;
 119         udreq->OPT_length = unitdata->opt.len;
 120         udreq->OPT_offset = 0;
 121         size = (int)sizeof (struct T_unitdata_req);
 122
 123         if (unitdata->addr.len) {
 124                 if (_t_aligned_copy(&ctlbuf, unitdata->addr.len, size,
 125                     unitdata->addr.buf, &udreq->DEST_offset) < 0) {
 126                         /*
 127                          * Aligned copy based will overflow buffer
 128                          * allocated based on maximum transport address
 129                          * size information
 130                          */
 131                         t_errno = TSYSERR;
 132                         errno = EPROTO;
 133                         goto err_out;
 134                 }
 135                 size = udreq->DEST_offset + udreq->DEST_length;
 136         }
 137         if (unitdata->opt.len) {
 138                 if (_t_aligned_copy(&ctlbuf, unitdata->opt.len, size,
 139                     unitdata->opt.buf, &udreq->OPT_offset) < 0) {
 140                         /*
 141                          * Aligned copy based will overflow buffer
 142                          * allocated based on maximum transport option
 143                          * size information
 144                          */
 145                         t_errno = TSYSERR;
 146                         errno = EPROTO;
 147                         goto err_out;
 148                 }
 149                 size = udreq->OPT_offset + udreq->OPT_length;
 150         }
 151
 152         if (size > (int)ctlbuf.maxlen) {
 153                 t_errno = TSYSERR;
 154                 errno = EIO;
 155                 goto err_out;
 156         }
 157
 158         ctlbuf.len = size;
 159
 160         /*
 161          * Calls to send data (write or putmsg) can potentially
 162          * block, for MT case, we drop the lock and enable signals here
 163          * and acquire it back.
 164          * At this point, we are sure SENDZERO is supported and the
 165          * putmsg below may send a zero length message,
 166          * (i.e with valid control part, but zero data part)
 167          */
 168         sig_mutex_unlock(&tiptr->ti_lock);
 169         if (putmsg(fd, &ctlbuf, (struct strbuf *)&unitdata->udata, 0) < 0) {
 170                 if (errno == EAGAIN)
 171                         t_errno = TFLOW;
 172                 else
 173                         t_errno = TSYSERR;
 174                 sv_errno = errno;
 175                 sig_mutex_lock(&tiptr->ti_lock);
 176                 errno = sv_errno;
 177                 goto err_out;
 178         }
 179         sig_mutex_lock(&tiptr->ti_lock);
 180
 181         _T_TX_NEXTSTATE(T_SNDUDATA, tiptr,
 182                         "t_sndudata: invalid state event T_SNDUDATA");
 183         if (didalloc)
 184                 free(ctlbuf.buf);
 185         else
 186                 tiptr->ti_ctlbuf = ctlbuf.buf;
 187         sig_mutex_unlock(&tiptr->ti_lock);
 188         return (0);
 189 err_out:
 190         sv_errno = errno;
 191         if (didalloc)
 192                 free(ctlbuf.buf);
 193         else
 194                 tiptr->ti_ctlbuf = ctlbuf.buf;
 195         sig_mutex_unlock(&tiptr->ti_lock);
 196         errno = sv_errno;
 197         return (-1);
 198 }