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 * Copyright 2014 Nexenta Systems, Inc.  All rights reserved.
29 */
30
31/*
32 * t_sndudata.c and t_sndvudata.c are very similar and contain common code.
33 * Any changes to either of them should be reviewed to see whether they
34 * are applicable to the other file.
35 */
36#include "mt.h"
37#include <stdlib.h>
38#include <errno.h>
39#include <stropts.h>
40#include <sys/stream.h>
41#define	_SUN_TPI_VERSION 2
42#include <sys/tihdr.h>
43#include <sys/timod.h>
44#include <xti.h>
45#include <syslog.h>
46#include <assert.h>
47#include "tx.h"
48
49int
50_tx_sndvudata(int fd, const struct t_unitdata *unitdata, struct t_iovec *tiov,
51    unsigned int tiovcount, int api_semantics)
52{
53	struct T_unitdata_req *udreq;
54	struct strbuf ctlbuf;
55	struct strbuf databuf;
56	int size;
57	struct _ti_user *tiptr;
58	int sv_errno;
59	int didalloc;
60	char *dataptr = NULL;
61	unsigned int nbytes;
62
63	assert(api_semantics == TX_XTI_XNS5_API);
64	if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
65		return (-1);
66	sig_mutex_lock(&tiptr->ti_lock);
67
68	if (tiptr->ti_servtype != T_CLTS) {
69		t_errno = TNOTSUPPORT;
70		sig_mutex_unlock(&tiptr->ti_lock);
71		return (-1);
72	}
73
74	if (tiovcount == 0 || tiovcount > T_IOV_MAX) {
75		t_errno = TBADDATA;
76		sig_mutex_unlock(&tiptr->ti_lock);
77		return (-1);
78	}
79
80	if (tiptr->ti_state != T_IDLE) {
81		t_errno = TOUTSTATE;
82		sig_mutex_unlock(&tiptr->ti_lock);
83		return (-1);
84	}
85
86	nbytes = _t_bytecount_upto_intmax(tiov, tiovcount);
87
88	if ((nbytes == 0) &&
89	    !(tiptr->ti_prov_flag & (SENDZERO|OLD_SENDZERO))) {
90		t_errno = TBADDATA;
91		sig_mutex_unlock(&tiptr->ti_lock);
92		return (-1);
93	}
94
95	if ((tiptr->ti_maxpsz > 0) && (nbytes > (uint32_t)tiptr->ti_maxpsz)) {
96		t_errno = TBADDATA;
97		sv_errno = errno;
98		sig_mutex_unlock(&tiptr->ti_lock);
99		errno = sv_errno;
100		return (-1);
101	}
102
103	/*
104	 * Acquire ctlbuf for use in sending/receiving control part
105	 * of the message.
106	 */
107	if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
108		sv_errno = errno;
109		sig_mutex_unlock(&tiptr->ti_lock);
110		errno = sv_errno;
111		return (-1);
112	}
113
114	/* LINTED pointer cast */
115	udreq = (struct T_unitdata_req *)ctlbuf.buf;
116
117	udreq->PRIM_type = T_UNITDATA_REQ;
118	udreq->DEST_length = unitdata->addr.len;
119	udreq->DEST_offset = 0;
120	udreq->OPT_length = unitdata->opt.len;
121	udreq->OPT_offset = 0;
122	size = (int)sizeof (struct T_unitdata_req);
123
124	if (unitdata->addr.len) {
125		if (_t_aligned_copy(&ctlbuf, unitdata->addr.len, size,
126		    unitdata->addr.buf, &udreq->DEST_offset) < 0) {
127			/*
128			 * Aligned copy based will overflow buffer
129			 * allocated based on maximum transport address
130			 * size information
131			 */
132			t_errno = TSYSERR;
133			errno = EPROTO;
134			goto err_out;
135		}
136		size = udreq->DEST_offset + udreq->DEST_length;
137	}
138	if (unitdata->opt.len) {
139		if (_t_aligned_copy(&ctlbuf, unitdata->opt.len, size,
140		    unitdata->opt.buf, &udreq->OPT_offset) < 0) {
141			/*
142			 * Aligned copy based will overflow buffer
143			 * allocated based on maximum transport option
144			 * size information
145			 */
146			t_errno = TSYSERR;
147			errno = EPROTO;
148			goto err_out;
149		}
150		size = udreq->OPT_offset + udreq->OPT_length;
151	}
152
153	if (size > (int)ctlbuf.maxlen) {
154		t_errno = TSYSERR;
155		errno = EIO;
156		goto err_out;
157	}
158
159	ctlbuf.len = size;
160
161	if (nbytes != 0) {
162		if ((dataptr = malloc((size_t)nbytes)) == NULL) {
163			t_errno = TSYSERR;
164			goto err_out;
165		}
166		_t_gather(dataptr, tiov, tiovcount);
167	}
168	databuf.buf = dataptr;
169	databuf.len = nbytes;
170	databuf.maxlen = nbytes;
171	/*
172	 * Calls to send data (write or putmsg) can potentially
173	 * block, for MT case, we drop the lock and enable signals here
174	 * and acquire it back
175	 */
176	sig_mutex_unlock(&tiptr->ti_lock);
177	if (putmsg(fd, &ctlbuf, &databuf, 0) < 0) {
178		if (errno == EAGAIN)
179			t_errno = TFLOW;
180		else
181			t_errno = TSYSERR;
182		sv_errno = errno;
183		sig_mutex_lock(&tiptr->ti_lock);
184		errno = sv_errno;
185		goto err_out;
186	}
187	sig_mutex_lock(&tiptr->ti_lock);
188
189	_T_TX_NEXTSTATE(T_SNDUDATA, tiptr,
190	    "t_sndvudata: invalid state event T_SNDUDATA");
191	if (didalloc)
192		free(ctlbuf.buf);
193	else
194		tiptr->ti_ctlbuf = ctlbuf.buf;
195	free(dataptr);
196	sig_mutex_unlock(&tiptr->ti_lock);
197	return (0);
198err_out:
199	sv_errno = errno;
200	if (didalloc)
201		free(ctlbuf.buf);
202	else
203		tiptr->ti_ctlbuf = ctlbuf.buf;
204	free(dataptr);
205	sig_mutex_unlock(&tiptr->ti_lock);
206	errno = sv_errno;
207	return (-1);
208}
209