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 /*
24 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
25 * Use is subject to license terms.
26 */
27
28 /*
29 * t_rcvrel.c and t_rcvreldata.c are very similar and contain common code.
30 * Any changes to either of them should be reviewed to see whether they
31 * are applicable to the other file.
32 */
33 #include "mt.h"
34 #include <stdlib.h>
35 #include <errno.h>
36 #include <stropts.h>
37 #include <sys/stream.h>
38 #define _SUN_TPI_VERSION 2
39 #include <sys/tihdr.h>
40 #include <sys/timod.h>
41 #include <xti.h>
42 #include <signal.h>
43 #include <syslog.h>
44 #include <assert.h>
45 #include "tx.h"
46
47 /* ARGSUSED */
48 int
_tx_rcvreldata(int fd,struct t_discon * discon,int api_semantics)49 _tx_rcvreldata(int fd, struct t_discon *discon, int api_semantics)
50 {
51 struct strbuf ctlbuf;
52 struct strbuf databuf;
53 int retval;
54 union T_primitives *pptr;
55 struct _ti_user *tiptr;
56 int sv_errno;
57 int didalloc, didralloc;
58
59 int flg = 0;
60
61
62 assert(api_semantics == TX_XTI_XNS5_API);
63 if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == 0)
64 return (-1);
65 sig_mutex_lock(&tiptr->ti_lock);
66
67 if (tiptr->ti_servtype != T_COTS_ORD) {
68 t_errno = TNOTSUPPORT;
69 sig_mutex_unlock(&tiptr->ti_lock);
70 return (-1);
71 }
72
73 if (!(tiptr->ti_state == T_DATAXFER ||
74 tiptr->ti_state == T_OUTREL)) {
75 t_errno = TOUTSTATE;
76 sig_mutex_unlock(&tiptr->ti_lock);
77 return (-1);
78 }
79
80 if ((retval = _t_look_locked(fd, tiptr, 0, api_semantics)) < 0) {
81 sv_errno = errno;
82 sig_mutex_unlock(&tiptr->ti_lock);
83 errno = sv_errno;
84 return (-1);
85 }
86
87 if (retval == T_DISCONNECT) {
88 /*
89 * This ensures preference to T_DISCON_IND which is
90 * the design model for TPI
91 */
92 t_errno = TLOOK;
93 sig_mutex_unlock(&tiptr->ti_lock);
94 return (-1);
95 }
96
97 /*
98 * Someday there could be transport providers that support T_ORDRELDATA
99 * Until then this function behaves the same as t_rcvrel()
100 * Note: Currently only mOSI ("minimal OSI") provider is specified
101 * to use T_ORDRELDATA so probability of needing it is minimal.
102 */
103
104 if ((tiptr->ti_lookcnt > 0) &&
105 /* LINTED pointer cast */
106 (*((t_scalar_t *)tiptr->ti_lookbufs.tl_lookcbuf) == T_ORDREL_IND)) {
107 /*
108 * Current look buffer event is T_ORDREL_IND.
109 * Remove it from look buffer event list.
110 */
111 _t_free_looklist_head(tiptr);
112 _T_TX_NEXTSTATE(T_RCVREL, tiptr,
113 "t_rcvreldata: invalid state event T_RCVREL");
114 sig_mutex_unlock(&tiptr->ti_lock);
115 return (0);
116 } else {
117 if (retval != T_ORDREL) {
118 t_errno = TNOREL;
119 sig_mutex_unlock(&tiptr->ti_lock);
120 return (-1);
121 }
122 }
123
124 /*
125 * get ordrel off read queue.
126 * use ctl and rcv buffers
127 *
128 * Acquire ctlbuf for use in sending/receiving control part
129 * of the message.
130 */
131 if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
132 sv_errno = errno;
133 sig_mutex_unlock(&tiptr->ti_lock);
134 errno = sv_errno;
135 return (-1);
136 }
137
138 /*
139 * Acquire databuf for use in sending/receiving data part
140 */
141 if (_t_acquire_databuf(tiptr, &databuf, &didralloc) < 0) {
142 sv_errno = errno;
143 if (didalloc)
144 free(ctlbuf.buf);
145 else
146 tiptr->ti_ctlbuf = ctlbuf.buf;
147 sig_mutex_unlock(&tiptr->ti_lock);
148 errno = sv_errno;
149 return (-1);
150 }
151
152 /*
153 * Since we have verified above that an orderly release event
154 * is pending on this endpoint, we assume that this getmsg()
155 * cannot block forever.
156 */
157 do {
158 retval = getmsg(fd, &ctlbuf, &databuf, &flg);
159 } while (retval < 0 && errno == EINTR);
160
161 if (retval < 0) {
162 t_errno = TSYSERR;
163 goto err_out;
164 }
165
166 /*
167 * did I get entire message?
168 */
169 if (retval > 0) {
170 t_errno = TSYSERR;
171 errno = EIO;
172 goto err_out;
173 }
174 /* LINTED pointer cast */
175 pptr = (union T_primitives *)ctlbuf.buf;
176
177 if (ctlbuf.len < (int)sizeof (struct T_ordrel_ind)) {
178 t_errno = TSYSERR;
179 errno = EPROTO;
180 goto err_out;
181 }
182 if (pptr->type != T_ORDREL_IND) {
183 if (pptr->type == T_DISCON_IND) {
184 /*
185 * T_DISCON_IND gets priority following
186 * TPI design philosphy.
187 *
188 * Add it to the events in the "look buffer"
189 * list of events. This routine may defer signals.
190 */
191 if (_t_register_lookevent(tiptr, databuf.buf,
192 databuf.len, ctlbuf.buf,
193 ctlbuf.len) < 0) {
194 t_errno = TSYSERR;
195 errno = ENOMEM;
196 goto err_out;
197 }
198 t_errno = TLOOK;
199 goto err_out;
200 } else {
201 t_errno = TSYSERR;
202 errno = EPROTO;
203 goto err_out;
204 }
205 }
206
207 _T_TX_NEXTSTATE(T_RCVREL, tiptr,
208 "t_rcvreldata: invalid state event T_RCVREL");
209
210 if (didalloc)
211 free(ctlbuf.buf);
212 else
213 tiptr->ti_ctlbuf = ctlbuf.buf;
214 if (didralloc)
215 free(databuf.buf);
216 else
217 tiptr->ti_rcvbuf = databuf.buf;
218 sig_mutex_unlock(&tiptr->ti_lock);
219 return (0);
220
221 err_out:
222 sv_errno = errno;
223
224 if (didalloc)
225 free(ctlbuf.buf);
226 else
227 tiptr->ti_ctlbuf = ctlbuf.buf;
228 if (didralloc)
229 free(databuf.buf);
230 else
231 tiptr->ti_rcvbuf = databuf.buf;
232 sig_mutex_unlock(&tiptr->ti_lock);
233 errno = sv_errno;
234 return (-1);
235 }
236