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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26
27 #include "mt.h"
28 #include <unistd.h>
29 #include <stdlib.h>
30 #include <errno.h>
31 #include <stropts.h>
32 #include <sys/stream.h>
33 #define _SUN_TPI_VERSION 2
34 #include <sys/tihdr.h>
35 #include <sys/timod.h>
36 #include <xti.h>
37 #include <assert.h>
38 #include <syslog.h>
39 #include "tx.h"
40
41
42 /*
43 * t_snd.c and t_sndv.c are very similar and contain common code.
44 * Any changes to either of them should be reviewed to see whether they
45 * are applicable to the other file.
46 */
47 int
_tx_sndv(int fd,const struct t_iovec * tiov,unsigned int tiovcount,int flags,int api_semantics)48 _tx_sndv(int fd, const struct t_iovec *tiov, unsigned int tiovcount,
49 int flags, int api_semantics)
50 {
51 struct T_data_req datareq;
52 struct strbuf ctlbuf, databuf;
53 unsigned int bytes_sent, bytes_remaining, bytes_to_send, nbytes;
54 char *curptr;
55 struct iovec iov[T_IOV_MAX];
56 int iovcount;
57 char *dataptr = NULL;
58 int first_time;
59 struct _ti_user *tiptr;
60 int band;
61 int retval, lookevent;
62 int sv_errno;
63 int doputmsg = 0;
64 int32_t tsdu_limit;
65
66 assert(api_semantics == TX_XTI_XNS5_API);
67 if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
68 return (-1);
69 sig_mutex_lock(&tiptr->ti_lock);
70
71 if (tiptr->ti_servtype == T_CLTS) {
72 t_errno = TNOTSUPPORT;
73 sig_mutex_unlock(&tiptr->ti_lock);
74 return (-1);
75 }
76
77 if (tiovcount == 0 || tiovcount > T_IOV_MAX) {
78 t_errno = TBADDATA;
79 sig_mutex_unlock(&tiptr->ti_lock);
80 return (-1);
81 }
82
83 if (!(tiptr->ti_state == T_DATAXFER ||
84 tiptr->ti_state == T_INREL)) {
85 t_errno = TOUTSTATE;
86 sig_mutex_unlock(&tiptr->ti_lock);
87 return (-1);
88 }
89 /*
90 * XXX
91 * Is it OK to do this TBADFLAG check when XTI spec
92 * is being extended with new and interesting flags
93 * everyday ?
94 */
95 if ((flags & ~(TX_ALL_VALID_FLAGS)) != 0) {
96 t_errno = TBADFLAG;
97 sig_mutex_unlock(&tiptr->ti_lock);
98 return (-1);
99 }
100 if (flags & T_EXPEDITED)
101 tsdu_limit = tiptr->ti_etsdusize;
102 else {
103 /* normal data */
104 tsdu_limit = tiptr->ti_tsdusize;
105 }
106
107 /*
108 * nbytes is the sum of the bytecounts in the tiov vector
109 * A value larger than INT_MAX is truncated to INT_MAX by
110 * _t_bytecount_upto_intmax()
111 */
112 nbytes = _t_bytecount_upto_intmax(tiov, tiovcount);
113
114 if ((tsdu_limit > 0) && /* limit meaningful and ... */
115 (nbytes > (uint32_t)tsdu_limit)) {
116 t_errno = TBADDATA;
117 sig_mutex_unlock(&tiptr->ti_lock);
118 return (-1);
119 }
120
121 /*
122 * Check for incoming disconnect only. XNS Issue 5 makes it optional
123 * to check for incoming orderly release
124 */
125 lookevent = _t_look_locked(fd, tiptr, 0, api_semantics);
126 if (lookevent < 0) {
127 sv_errno = errno;
128 sig_mutex_unlock(&tiptr->ti_lock);
129 errno = sv_errno;
130 return (-1);
131 }
132 if (lookevent == T_DISCONNECT) {
133 t_errno = TLOOK;
134 sig_mutex_unlock(&tiptr->ti_lock);
135 return (-1);
136 }
137
138 /* sending zero length data when not allowed */
139 if (nbytes == 0 && !(tiptr->ti_prov_flag & (SENDZERO|OLD_SENDZERO))) {
140 t_errno = TBADDATA;
141 sig_mutex_unlock(&tiptr->ti_lock);
142 return (-1);
143 }
144
145 doputmsg = (tiptr->ti_tsdusize != 0) || (flags & T_EXPEDITED);
146
147 if (doputmsg) {
148 /*
149 * Initialize ctlbuf for use in sending/receiving control part
150 * of the message.
151 */
152 ctlbuf.maxlen = (int)sizeof (struct T_data_req);
153 ctlbuf.len = (int)sizeof (struct T_data_req);
154 ctlbuf.buf = (char *)&datareq;
155
156 band = TI_NORMAL; /* band 0 */
157 if (flags & T_EXPEDITED) {
158 datareq.PRIM_type = T_EXDATA_REQ;
159 if (!(tiptr->ti_prov_flag & EXPINLINE))
160 band = TI_EXPEDITED; /* band > 0 */
161 } else
162 datareq.PRIM_type = T_DATA_REQ;
163 /*
164 * Allocate a databuffer into which we will gather the
165 * input vector data, and make a call to putmsg(). We
166 * do this since we don't have the equivalent of a putmsgv()
167 */
168 if (nbytes != 0) {
169 if ((dataptr = malloc((size_t)nbytes)) == NULL) {
170 sv_errno = errno;
171 sig_mutex_unlock(&tiptr->ti_lock);
172 errno = sv_errno;
173 t_errno = TSYSERR;
174 return (-1); /* error */
175 }
176 /*
177 * Gather the input buffers, into the single linear
178 * buffer allocated above, while taking care to see
179 * that no more than INT_MAX bytes will be copied.
180 */
181 _t_gather(dataptr, tiov, tiovcount);
182 curptr = dataptr; /* Initialize for subsequent use */
183 } else {
184 dataptr = NULL;
185 curptr = NULL;
186 }
187 }
188
189 bytes_remaining = nbytes;
190 /*
191 * Calls to send data (write or putmsg) can potentially
192 * block, for MT case, we drop the lock and enable signals here
193 * and acquire it back
194 */
195 sig_mutex_unlock(&tiptr->ti_lock);
196 first_time = 1;
197 do {
198 bytes_to_send = bytes_remaining;
199 if (doputmsg) {
200 /*
201 * transport provider supports TSDU concept
202 * (unlike TCP) or it is expedited data.
203 * In this case do the fragmentation
204 */
205 if (bytes_to_send > (unsigned int)tiptr->ti_maxpsz) {
206 datareq.MORE_flag = 1;
207 bytes_to_send = (unsigned int)tiptr->ti_maxpsz;
208 } else {
209 if (flags&T_MORE)
210 datareq.MORE_flag = 1;
211 else
212 datareq.MORE_flag = 0;
213 }
214 databuf.maxlen = bytes_to_send;
215 databuf.len = bytes_to_send;
216 databuf.buf = curptr;
217 retval = putpmsg(fd, &ctlbuf, &databuf, band, MSG_BAND);
218 if (retval == 0) {
219 bytes_sent = bytes_to_send;
220 curptr = curptr + bytes_sent;
221 }
222 } else {
223 /*
224 * transport provider does *not* support TSDU concept
225 * (e.g. TCP) and it is not expedited data. A
226 * perf. optimization is used. Note: the T_MORE
227 * flag is ignored here even if set by the user.
228 */
229 /*
230 * The first time, setup the tiovec for doing a writev
231 * call. We assume that T_IOV_MAX <= IOV_MAX.
232 * Since writev may return a partial count, we need
233 * the loop. After the first time, we just adjust
234 * the iov vector to not include the already
235 * written bytes.
236 */
237 if (first_time) {
238 first_time = 0;
239 _t_copy_tiov_to_iov(tiov, tiovcount, iov,
240 &iovcount);
241 } else {
242 /*
243 * bytes_sent - value set below in the previous
244 * iteration of the loop is used now.
245 */
246 _t_adjust_iov(bytes_sent, iov, &iovcount);
247 }
248 retval = (int)writev(fd, iov, iovcount);
249 if (retval >= 0) {
250 /* Amount that was actually sent */
251 bytes_sent = retval;
252 }
253 }
254
255 if (retval < 0) {
256 if (nbytes == bytes_remaining) {
257 /*
258 * Error on *first* putmsg/write attempt.
259 * Return appropriate error
260 */
261 if (errno == EAGAIN)
262 t_errno = TFLOW;
263 else
264 t_errno = TSYSERR;
265 if (dataptr)
266 free(dataptr);
267 return (-1); /* return error */
268 }
269 /*
270 * Not the first putmsg/write
271 * [ partial completion of t_snd() case.
272 *
273 * Error on putmsg/write attempt but
274 * some data was transmitted so don't
275 * return error. Don't attempt to
276 * send more (break from loop) but
277 * return OK.
278 */
279 break;
280 }
281 bytes_remaining = bytes_remaining - bytes_sent;
282 } while (bytes_remaining != 0);
283
284 if (dataptr != NULL)
285 free(dataptr);
286 _T_TX_NEXTSTATE(T_SND, tiptr, "t_snd: invalid state event T_SND");
287 return (nbytes - bytes_remaining);
288 }
289