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 #pragma ident "%Z%%M% %I% %E% SMI"
29
30 /*
31 * t_rcvrel.c and t_rcvreldata.c are very similar and contain common code.
32 * Any changes to either of them should be reviewed to see whether they
33 * are applicable to the other file.
34 */
35 #include "mt.h"
36 #include <stdlib.h>
37 #include <errno.h>
38 #include <stropts.h>
39 #include <sys/stream.h>
40 #define _SUN_TPI_VERSION 2
41 #include <sys/tihdr.h>
42 #include <sys/timod.h>
43 #include <xti.h>
44 #include <signal.h>
45 #include <syslog.h>
46 #include <assert.h>
47 #include "tx.h"
48
49 /* ARGSUSED */
50 int
_tx_rcvreldata(int fd,struct t_discon * discon,int api_semantics)51 _tx_rcvreldata(int fd, struct t_discon *discon, int api_semantics)
52 {
53 struct strbuf ctlbuf;
54 struct strbuf databuf;
55 int retval;
56 union T_primitives *pptr;
57 struct _ti_user *tiptr;
58 int sv_errno;
59 int didalloc, didralloc;
60
61 int flg = 0;
62
63
64 assert(api_semantics == TX_XTI_XNS5_API);
65 if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == 0)
66 return (-1);
67 sig_mutex_lock(&tiptr->ti_lock);
68
69 if (tiptr->ti_servtype != T_COTS_ORD) {
70 t_errno = TNOTSUPPORT;
71 sig_mutex_unlock(&tiptr->ti_lock);
72 return (-1);
73 }
74
75 if (!(tiptr->ti_state == T_DATAXFER ||
76 tiptr->ti_state == T_OUTREL)) {
77 t_errno = TOUTSTATE;
78 sig_mutex_unlock(&tiptr->ti_lock);
79 return (-1);
80 }
81
82 if ((retval = _t_look_locked(fd, tiptr, 0, api_semantics)) < 0) {
83 sv_errno = errno;
84 sig_mutex_unlock(&tiptr->ti_lock);
85 errno = sv_errno;
86 return (-1);
87 }
88
89 if (retval == T_DISCONNECT) {
90 /*
91 * This ensures preference to T_DISCON_IND which is
92 * the design model for TPI
93 */
94 t_errno = TLOOK;
95 sig_mutex_unlock(&tiptr->ti_lock);
96 return (-1);
97 }
98
99 /*
100 * Someday there could be transport providers that support T_ORDRELDATA
101 * Until then this function behaves the same as t_rcvrel()
102 * Note: Currently only mOSI ("minimal OSI") provider is specified
103 * to use T_ORDRELDATA so probability of needing it is minimal.
104 */
105
106 if ((tiptr->ti_lookcnt > 0) &&
107 /* LINTED pointer cast */
108 (*((t_scalar_t *)tiptr->ti_lookbufs.tl_lookcbuf) == T_ORDREL_IND)) {
109 /*
110 * Current look buffer event is T_ORDREL_IND.
111 * Remove it from look buffer event list.
112 */
113 _t_free_looklist_head(tiptr);
114 _T_TX_NEXTSTATE(T_RCVREL, tiptr,
115 "t_rcvreldata: invalid state event T_RCVREL");
116 sig_mutex_unlock(&tiptr->ti_lock);
117 return (0);
118 } else {
119 if (retval != T_ORDREL) {
120 t_errno = TNOREL;
121 sig_mutex_unlock(&tiptr->ti_lock);
122 return (-1);
123 }
124 }
125
126 /*
127 * get ordrel off read queue.
128 * use ctl and rcv buffers
129 *
130 * Acquire ctlbuf for use in sending/receiving control part
131 * of the message.
132 */
133 if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
134 sv_errno = errno;
135 sig_mutex_unlock(&tiptr->ti_lock);
136 errno = sv_errno;
137 return (-1);
138 }
139
140 /*
141 * Acquire databuf for use in sending/receiving data part
142 */
143 if (_t_acquire_databuf(tiptr, &databuf, &didralloc) < 0) {
144 sv_errno = errno;
145 if (didalloc)
146 free(ctlbuf.buf);
147 else
148 tiptr->ti_ctlbuf = ctlbuf.buf;
149 sig_mutex_unlock(&tiptr->ti_lock);
150 errno = sv_errno;
151 return (-1);
152 }
153
154 /*
155 * Since we have verified above that an orderly release event
156 * is pending on this endpoint, we assume that this getmsg()
157 * cannot block forever.
158 */
159 do {
160 retval = getmsg(fd, &ctlbuf, &databuf, &flg);
161 } while (retval < 0 && errno == EINTR);
162
163 if (retval < 0) {
164 t_errno = TSYSERR;
165 goto err_out;
166 }
167
168 /*
169 * did I get entire message?
170 */
171 if (retval > 0) {
172 t_errno = TSYSERR;
173 errno = EIO;
174 goto err_out;
175 }
176 /* LINTED pointer cast */
177 pptr = (union T_primitives *)ctlbuf.buf;
178
179 if (ctlbuf.len < (int)sizeof (struct T_ordrel_ind)) {
180 t_errno = TSYSERR;
181 errno = EPROTO;
182 goto err_out;
183 }
184 if (pptr->type != T_ORDREL_IND) {
185 if (pptr->type == T_DISCON_IND) {
186 /*
187 * T_DISCON_IND gets priority following
188 * TPI design philosphy.
189 *
190 * Add it to the events in the "look buffer"
191 * list of events. This routine may defer signals.
192 */
193 if (_t_register_lookevent(tiptr, databuf.buf,
194 databuf.len, ctlbuf.buf,
195 ctlbuf.len) < 0) {
196 t_errno = TSYSERR;
197 errno = ENOMEM;
198 goto err_out;
199 }
200 t_errno = TLOOK;
201 goto err_out;
202 } else {
203 t_errno = TSYSERR;
204 errno = EPROTO;
205 goto err_out;
206 }
207 }
208
209 _T_TX_NEXTSTATE(T_RCVREL, tiptr,
210 "t_rcvreldata: invalid state event T_RCVREL");
211
212 if (didalloc)
213 free(ctlbuf.buf);
214 else
215 tiptr->ti_ctlbuf = ctlbuf.buf;
216 if (didralloc)
217 free(databuf.buf);
218 else
219 tiptr->ti_rcvbuf = databuf.buf;
220 sig_mutex_unlock(&tiptr->ti_lock);
221 return (0);
222
223 err_out:
224 sv_errno = errno;
225
226 if (didalloc)
227 free(ctlbuf.buf);
228 else
229 tiptr->ti_ctlbuf = ctlbuf.buf;
230 if (didralloc)
231 free(databuf.buf);
232 else
233 tiptr->ti_rcvbuf = databuf.buf;
234 sig_mutex_unlock(&tiptr->ti_lock);
235 errno = sv_errno;
236 return (-1);
237 }
238