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 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
22 /* All Rights Reserved */
23
24
25 /*
26 * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
27 */
28
29 #include <sys/types.h>
30 #include <sys/sysmacros.h>
31 #include <sys/param.h>
32 #include <sys/errno.h>
33 #include <sys/signal.h>
34 #include <sys/stat.h>
35 #include <sys/proc.h>
36 #include <sys/cred.h>
37 #include <sys/user.h>
38 #include <sys/vnode.h>
39 #include <sys/file.h>
40 #include <sys/stream.h>
41 #include <sys/strsubr.h>
42 #include <sys/stropts.h>
43 #include <sys/tihdr.h>
44 #include <sys/var.h>
45 #include <sys/poll.h>
46 #include <sys/termio.h>
47 #include <sys/ttold.h>
48 #include <sys/systm.h>
49 #include <sys/uio.h>
50 #include <sys/cmn_err.h>
51 #include <sys/sad.h>
52 #include <sys/netstack.h>
53 #include <sys/priocntl.h>
54 #include <sys/jioctl.h>
55 #include <sys/procset.h>
56 #include <sys/session.h>
57 #include <sys/kmem.h>
58 #include <sys/filio.h>
59 #include <sys/vtrace.h>
60 #include <sys/debug.h>
61 #include <sys/strredir.h>
62 #include <sys/fs/fifonode.h>
63 #include <sys/fs/snode.h>
64 #include <sys/strlog.h>
65 #include <sys/strsun.h>
66 #include <sys/project.h>
67 #include <sys/kbio.h>
68 #include <sys/msio.h>
69 #include <sys/tty.h>
70 #include <sys/ptyvar.h>
71 #include <sys/vuid_event.h>
72 #include <sys/modctl.h>
73 #include <sys/sunddi.h>
74 #include <sys/sunldi_impl.h>
75 #include <sys/autoconf.h>
76 #include <sys/policy.h>
77 #include <sys/dld.h>
78 #include <sys/zone.h>
79 #include <c2/audit.h>
80
81 /*
82 * This define helps improve the readability of streams code while
83 * still maintaining a very old streams performance enhancement. The
84 * performance enhancement basically involved having all callers
85 * of straccess() perform the first check that straccess() will do
86 * locally before actually calling straccess(). (There by reducing
87 * the number of unnecessary calls to straccess().)
88 */
89 #define i_straccess(x, y) ((stp->sd_sidp == NULL) ? 0 : \
90 (stp->sd_vnode->v_type == VFIFO) ? 0 : \
91 straccess((x), (y)))
92
93 /*
94 * what is mblk_pull_len?
95 *
96 * If a streams message consists of many short messages,
97 * a performance degradation occurs from copyout overhead.
98 * To decrease the per mblk overhead, messages that are
99 * likely to consist of many small mblks are pulled up into
100 * one continuous chunk of memory.
101 *
102 * To avoid the processing overhead of examining every
103 * mblk, a quick heuristic is used. If the first mblk in
104 * the message is shorter than mblk_pull_len, it is likely
105 * that the rest of the mblk will be short.
106 *
107 * This heuristic was decided upon after performance tests
108 * indicated that anything more complex slowed down the main
109 * code path.
110 */
111 #define MBLK_PULL_LEN 64
112 uint32_t mblk_pull_len = MBLK_PULL_LEN;
113
114 /*
115 * The sgttyb_handling flag controls the handling of the old BSD
116 * TIOCGETP, TIOCSETP, and TIOCSETN ioctls as follows:
117 *
118 * 0 - Emit no warnings at all and retain old, broken behavior.
119 * 1 - Emit no warnings and silently handle new semantics.
120 * 2 - Send cmn_err(CE_NOTE) when either TIOCSETP or TIOCSETN is used
121 * (once per system invocation). Handle with new semantics.
122 * 3 - Send SIGSYS when any TIOCGETP, TIOCSETP, or TIOCSETN call is
123 * made (so that offenders drop core and are easy to debug).
124 *
125 * The "new semantics" are that TIOCGETP returns B38400 for
126 * sg_[io]speed if the corresponding value is over B38400, and that
127 * TIOCSET[PN] accept B38400 in these cases to mean "retain current
128 * bit rate."
129 */
130 int sgttyb_handling = 1;
131 static boolean_t sgttyb_complaint;
132
133 /* don't push drcompat module by default on Style-2 streams */
134 static int push_drcompat = 0;
135
136 /*
137 * id value used to distinguish between different ioctl messages
138 */
139 static uint32_t ioc_id;
140
141 static void putback(struct stdata *, queue_t *, mblk_t *, int);
142 static void strcleanall(struct vnode *);
143 static int strwsrv(queue_t *);
144 static int strdocmd(struct stdata *, struct strcmd *, cred_t *);
145
146 /*
147 * qinit and module_info structures for stream head read and write queues
148 */
149 struct module_info strm_info = { 0, "strrhead", 0, INFPSZ, STRHIGH, STRLOW };
150 struct module_info stwm_info = { 0, "strwhead", 0, 0, 0, 0 };
151 struct qinit strdata = { strrput, NULL, NULL, NULL, NULL, &strm_info };
152 struct qinit stwdata = { NULL, strwsrv, NULL, NULL, NULL, &stwm_info };
153 struct module_info fiform_info = { 0, "fifostrrhead", 0, PIPE_BUF, FIFOHIWAT,
154 FIFOLOWAT };
155 struct module_info fifowm_info = { 0, "fifostrwhead", 0, 0, 0, 0 };
156 struct qinit fifo_strdata = { strrput, NULL, NULL, NULL, NULL, &fiform_info };
157 struct qinit fifo_stwdata = { NULL, strwsrv, NULL, NULL, NULL, &fifowm_info };
158
159 extern kmutex_t strresources; /* protects global resources */
160 extern kmutex_t muxifier; /* single-threads multiplexor creation */
161
162 static boolean_t msghasdata(mblk_t *bp);
163 #define msgnodata(bp) (!msghasdata(bp))
164
165 /*
166 * Stream head locking notes:
167 * There are four monitors associated with the stream head:
168 * 1. v_stream monitor: in stropen() and strclose() v_lock
169 * is held while the association of vnode and stream
170 * head is established or tested for.
171 * 2. open/close/push/pop monitor: sd_lock is held while each
172 * thread bids for exclusive access to this monitor
173 * for opening or closing a stream. In addition, this
174 * monitor is entered during pushes and pops. This
175 * guarantees that during plumbing operations there
176 * is only one thread trying to change the plumbing.
177 * Any other threads present in the stream are only
178 * using the plumbing.
179 * 3. read/write monitor: in the case of read, a thread holds
180 * sd_lock while trying to get data from the stream
181 * head queue. if there is none to fulfill a read
182 * request, it sets RSLEEP and calls cv_wait_sig() down
183 * in strwaitq() to await the arrival of new data.
184 * when new data arrives in strrput(), sd_lock is acquired
185 * before testing for RSLEEP and calling cv_broadcast().
186 * the behavior of strwrite(), strwsrv(), and WSLEEP
187 * mirror this.
188 * 4. ioctl monitor: sd_lock is gotten to ensure that only one
189 * thread is doing an ioctl at a time.
190 */
191
192 static int
193 push_mod(queue_t *qp, dev_t *devp, struct stdata *stp, const char *name,
194 int anchor, cred_t *crp, uint_t anchor_zoneid)
195 {
196 int error;
197 fmodsw_impl_t *fp;
198
199 if (stp->sd_flag & (STRHUP|STRDERR|STWRERR)) {
200 error = (stp->sd_flag & STRHUP) ? ENXIO : EIO;
201 return (error);
202 }
203 if (stp->sd_pushcnt >= nstrpush) {
204 return (EINVAL);
205 }
206
207 if ((fp = fmodsw_find(name, FMODSW_HOLD | FMODSW_LOAD)) == NULL) {
208 stp->sd_flag |= STREOPENFAIL;
209 return (EINVAL);
210 }
211
212 /*
213 * push new module and call its open routine via qattach
214 */
215 if ((error = qattach(qp, devp, 0, crp, fp, B_FALSE)) != 0)
216 return (error);
217
218 /*
219 * Check to see if caller wants a STREAMS anchor
220 * put at this place in the stream, and add if so.
221 */
222 mutex_enter(&stp->sd_lock);
223 if (anchor == stp->sd_pushcnt) {
224 stp->sd_anchor = stp->sd_pushcnt;
225 stp->sd_anchorzone = anchor_zoneid;
226 }
227 mutex_exit(&stp->sd_lock);
228
229 return (0);
230 }
231
232 /*
233 * Open a stream device.
234 */
235 int
236 stropen(vnode_t *vp, dev_t *devp, int flag, cred_t *crp)
237 {
238 struct stdata *stp;
239 queue_t *qp;
240 int s;
241 dev_t dummydev, savedev;
242 struct autopush *ap;
243 struct dlautopush dlap;
244 int error = 0;
245 ssize_t rmin, rmax;
246 int cloneopen;
247 queue_t *brq;
248 major_t major;
249 str_stack_t *ss;
250 zoneid_t zoneid;
251 uint_t anchor;
252
253 /*
254 * If the stream already exists, wait for any open in progress
255 * to complete, then call the open function of each module and
256 * driver in the stream. Otherwise create the stream.
257 */
258 TRACE_1(TR_FAC_STREAMS_FR, TR_STROPEN, "stropen:%p", vp);
259 retry:
260 mutex_enter(&vp->v_lock);
261 if ((stp = vp->v_stream) != NULL) {
262
263 /*
264 * Waiting for stream to be created to device
265 * due to another open.
266 */
267 mutex_exit(&vp->v_lock);
268
269 if (STRMATED(stp)) {
270 struct stdata *strmatep = stp->sd_mate;
271
272 STRLOCKMATES(stp);
273 if (strmatep->sd_flag & (STWOPEN|STRCLOSE|STRPLUMB)) {
274 if (flag & (FNDELAY|FNONBLOCK)) {
275 error = EAGAIN;
276 mutex_exit(&strmatep->sd_lock);
277 goto ckreturn;
278 }
279 mutex_exit(&stp->sd_lock);
280 if (!cv_wait_sig(&strmatep->sd_monitor,
281 &strmatep->sd_lock)) {
282 error = EINTR;
283 mutex_exit(&strmatep->sd_lock);
284 mutex_enter(&stp->sd_lock);
285 goto ckreturn;
286 }
287 mutex_exit(&strmatep->sd_lock);
288 goto retry;
289 }
290 if (stp->sd_flag & (STWOPEN|STRCLOSE|STRPLUMB)) {
291 if (flag & (FNDELAY|FNONBLOCK)) {
292 error = EAGAIN;
293 mutex_exit(&strmatep->sd_lock);
294 goto ckreturn;
295 }
296 mutex_exit(&strmatep->sd_lock);
297 if (!cv_wait_sig(&stp->sd_monitor,
298 &stp->sd_lock)) {
299 error = EINTR;
300 goto ckreturn;
301 }
302 mutex_exit(&stp->sd_lock);
303 goto retry;
304 }
305
306 if (stp->sd_flag & (STRDERR|STWRERR)) {
307 error = EIO;
308 mutex_exit(&strmatep->sd_lock);
309 goto ckreturn;
310 }
311
312 stp->sd_flag |= STWOPEN;
313 STRUNLOCKMATES(stp);
314 } else {
315 mutex_enter(&stp->sd_lock);
316 if (stp->sd_flag & (STWOPEN|STRCLOSE|STRPLUMB)) {
317 if (flag & (FNDELAY|FNONBLOCK)) {
318 error = EAGAIN;
319 goto ckreturn;
320 }
321 if (!cv_wait_sig(&stp->sd_monitor,
322 &stp->sd_lock)) {
323 error = EINTR;
324 goto ckreturn;
325 }
326 mutex_exit(&stp->sd_lock);
327 goto retry; /* could be clone! */
328 }
329
330 if (stp->sd_flag & (STRDERR|STWRERR)) {
331 error = EIO;
332 goto ckreturn;
333 }
334
335 stp->sd_flag |= STWOPEN;
336 mutex_exit(&stp->sd_lock);
337 }
338
339 /*
340 * Open all modules and devices down stream to notify
341 * that another user is streaming. For modules, set the
342 * last argument to MODOPEN and do not pass any open flags.
343 * Ignore dummydev since this is not the first open.
344 */
345 claimstr(stp->sd_wrq);
346 qp = stp->sd_wrq;
347 while (_SAMESTR(qp)) {
348 qp = qp->q_next;
349 if ((error = qreopen(_RD(qp), devp, flag, crp)) != 0)
350 break;
351 }
352 releasestr(stp->sd_wrq);
353 mutex_enter(&stp->sd_lock);
354 stp->sd_flag &= ~(STRHUP|STWOPEN|STRDERR|STWRERR);
355 stp->sd_rerror = 0;
356 stp->sd_werror = 0;
357 ckreturn:
358 cv_broadcast(&stp->sd_monitor);
359 mutex_exit(&stp->sd_lock);
360 return (error);
361 }
362
363 /*
364 * This vnode isn't streaming. SPECFS already
365 * checked for multiple vnodes pointing to the
366 * same stream, so create a stream to the driver.
367 */
368 qp = allocq();
369 stp = shalloc(qp);
370
371 /*
372 * Initialize stream head. shalloc() has given us
373 * exclusive access, and we have the vnode locked;
374 * we can do whatever we want with stp.
375 */
376 stp->sd_flag = STWOPEN;
377 stp->sd_siglist = NULL;
378 stp->sd_pollist.ph_list = NULL;
379 stp->sd_sigflags = 0;
380 stp->sd_mark = NULL;
381 stp->sd_closetime = STRTIMOUT;
382 stp->sd_sidp = NULL;
383 stp->sd_pgidp = NULL;
384 stp->sd_vnode = vp;
385 stp->sd_rerror = 0;
386 stp->sd_werror = 0;
387 stp->sd_wroff = 0;
388 stp->sd_tail = 0;
389 stp->sd_iocblk = NULL;
390 stp->sd_cmdblk = NULL;
391 stp->sd_pushcnt = 0;
392 stp->sd_qn_minpsz = 0;
393 stp->sd_qn_maxpsz = INFPSZ - 1; /* used to check for initialization */
394 stp->sd_maxblk = INFPSZ;
395 qp->q_ptr = _WR(qp)->q_ptr = stp;
396 STREAM(qp) = STREAM(_WR(qp)) = stp;
397 vp->v_stream = stp;
398 mutex_exit(&vp->v_lock);
399 if (vp->v_type == VFIFO) {
400 stp->sd_flag |= OLDNDELAY;
401 /*
402 * This means, both for pipes and fifos
403 * strwrite will send SIGPIPE if the other
404 * end is closed. For putmsg it depends
405 * on whether it is a XPG4_2 application
406 * or not
407 */
408 stp->sd_wput_opt = SW_SIGPIPE;
409
410 /* setq might sleep in kmem_alloc - avoid holding locks. */
411 setq(qp, &fifo_strdata, &fifo_stwdata, NULL, QMTSAFE,
412 SQ_CI|SQ_CO, B_FALSE);
413
414 set_qend(qp);
415 stp->sd_strtab = fifo_getinfo();
416 _WR(qp)->q_nfsrv = _WR(qp);
417 qp->q_nfsrv = qp;
418 /*
419 * Wake up others that are waiting for stream to be created.
420 */
421 mutex_enter(&stp->sd_lock);
422 /*
423 * nothing is be pushed on stream yet, so
424 * optimized stream head packetsizes are just that
425 * of the read queue
426 */
427 stp->sd_qn_minpsz = qp->q_minpsz;
428 stp->sd_qn_maxpsz = qp->q_maxpsz;
429 stp->sd_flag &= ~STWOPEN;
430 goto fifo_opendone;
431 }
432 /* setq might sleep in kmem_alloc - avoid holding locks. */
433 setq(qp, &strdata, &stwdata, NULL, QMTSAFE, SQ_CI|SQ_CO, B_FALSE);
434
435 set_qend(qp);
436
437 /*
438 * Open driver and create stream to it (via qattach).
439 */
440 savedev = *devp;
441 cloneopen = (getmajor(*devp) == clone_major);
442 if ((error = qattach(qp, devp, flag, crp, NULL, B_FALSE)) != 0) {
443 mutex_enter(&vp->v_lock);
444 vp->v_stream = NULL;
445 mutex_exit(&vp->v_lock);
446 mutex_enter(&stp->sd_lock);
447 cv_broadcast(&stp->sd_monitor);
448 mutex_exit(&stp->sd_lock);
449 freeq(_RD(qp));
450 shfree(stp);
451 return (error);
452 }
453 /*
454 * Set sd_strtab after open in order to handle clonable drivers
455 */
456 stp->sd_strtab = STREAMSTAB(getmajor(*devp));
457
458 /*
459 * Historical note: dummydev used to be be prior to the initial
460 * open (via qattach above), which made the value seen
461 * inconsistent between an I_PUSH and an autopush of a module.
462 */
463 dummydev = *devp;
464
465 /*
466 * For clone open of old style (Q not associated) network driver,
467 * push DRMODNAME module to handle DL_ATTACH/DL_DETACH
468 */
469 brq = _RD(_WR(qp)->q_next);
470 major = getmajor(*devp);
471 if (push_drcompat && cloneopen && NETWORK_DRV(major) &&
472 ((brq->q_flag & _QASSOCIATED) == 0)) {
473 if (push_mod(qp, &dummydev, stp, DRMODNAME, 0, crp, 0) != 0)
474 cmn_err(CE_WARN, "cannot push " DRMODNAME
475 " streams module");
476 }
477
478 if (!NETWORK_DRV(major)) {
479 savedev = *devp;
480 } else {
481 /*
482 * For network devices, process differently based on the
483 * return value from dld_autopush():
484 *
485 * 0: the passed-in device points to a GLDv3 datalink with
486 * per-link autopush configuration; use that configuration
487 * and ignore any per-driver autopush configuration.
488 *
489 * 1: the passed-in device points to a physical GLDv3
490 * datalink without per-link autopush configuration. The
491 * passed in device was changed to refer to the actual
492 * physical device (if it's not already); we use that new
493 * device to look up any per-driver autopush configuration.
494 *
495 * -1: neither of the above cases applied; use the initial
496 * device to look up any per-driver autopush configuration.
497 */
498 switch (dld_autopush(&savedev, &dlap)) {
499 case 0:
500 zoneid = crgetzoneid(crp);
501 for (s = 0; s < dlap.dap_npush; s++) {
502 error = push_mod(qp, &dummydev, stp,
503 dlap.dap_aplist[s], dlap.dap_anchor, crp,
504 zoneid);
505 if (error != 0)
506 break;
507 }
508 goto opendone;
509 case 1:
510 break;
511 case -1:
512 savedev = *devp;
513 break;
514 }
515 }
516 /*
517 * Find the autopush configuration based on "savedev". Start with the
518 * global zone. If not found check in the local zone.
519 */
520 zoneid = GLOBAL_ZONEID;
521 retryap:
522 ss = netstack_find_by_stackid(zoneid_to_netstackid(zoneid))->
523 netstack_str;
524 if ((ap = sad_ap_find_by_dev(savedev, ss)) == NULL) {
525 netstack_rele(ss->ss_netstack);
526 if (zoneid == GLOBAL_ZONEID) {
527 /*
528 * None found. Also look in the zone's autopush table.
529 */
530 zoneid = crgetzoneid(crp);
531 if (zoneid != GLOBAL_ZONEID)
532 goto retryap;
533 }
534 goto opendone;
535 }
536 anchor = ap->ap_anchor;
537 zoneid = crgetzoneid(crp);
538 for (s = 0; s < ap->ap_npush; s++) {
539 error = push_mod(qp, &dummydev, stp, ap->ap_list[s],
540 anchor, crp, zoneid);
541 if (error != 0)
542 break;
543 }
544 sad_ap_rele(ap, ss);
545 netstack_rele(ss->ss_netstack);
546
547 opendone:
548
549 /*
550 * let specfs know that open failed part way through
551 */
552 if (error) {
553 mutex_enter(&stp->sd_lock);
554 stp->sd_flag |= STREOPENFAIL;
555 mutex_exit(&stp->sd_lock);
556 }
557
558 /*
559 * Wake up others that are waiting for stream to be created.
560 */
561 mutex_enter(&stp->sd_lock);
562 stp->sd_flag &= ~STWOPEN;
563
564 /*
565 * As a performance concern we are caching the values of
566 * q_minpsz and q_maxpsz of the module below the stream
567 * head in the stream head.
568 */
569 mutex_enter(QLOCK(stp->sd_wrq->q_next));
570 rmin = stp->sd_wrq->q_next->q_minpsz;
571 rmax = stp->sd_wrq->q_next->q_maxpsz;
572 mutex_exit(QLOCK(stp->sd_wrq->q_next));
573
574 /* do this processing here as a performance concern */
575 if (strmsgsz != 0) {
576 if (rmax == INFPSZ)
577 rmax = strmsgsz;
578 else
579 rmax = MIN(strmsgsz, rmax);
580 }
581
582 mutex_enter(QLOCK(stp->sd_wrq));
583 stp->sd_qn_minpsz = rmin;
584 stp->sd_qn_maxpsz = rmax;
585 mutex_exit(QLOCK(stp->sd_wrq));
586
587 fifo_opendone:
588 cv_broadcast(&stp->sd_monitor);
589 mutex_exit(&stp->sd_lock);
590 return (error);
591 }
592
593 static int strsink(queue_t *, mblk_t *);
594 static struct qinit deadrend = {
595 strsink, NULL, NULL, NULL, NULL, &strm_info, NULL
596 };
597 static struct qinit deadwend = {
598 NULL, NULL, NULL, NULL, NULL, &stwm_info, NULL
599 };
600
601 /*
602 * Close a stream.
603 * This is called from closef() on the last close of an open stream.
604 * Strclean() will already have removed the siglist and pollist
605 * information, so all that remains is to remove all multiplexor links
606 * for the stream, pop all the modules (and the driver), and free the
607 * stream structure.
608 */
609
610 int
611 strclose(struct vnode *vp, int flag, cred_t *crp)
612 {
613 struct stdata *stp;
614 queue_t *qp;
615 int rval;
616 int freestp = 1;
617 queue_t *rmq;
618
619 TRACE_1(TR_FAC_STREAMS_FR,
620 TR_STRCLOSE, "strclose:%p", vp);
621 ASSERT(vp->v_stream);
622
623 stp = vp->v_stream;
624 ASSERT(!(stp->sd_flag & STPLEX));
625 qp = stp->sd_wrq;
626
627 /*
628 * Needed so that strpoll will return non-zero for this fd.
629 * Note that with POLLNOERR STRHUP does still cause POLLHUP.
630 */
631 mutex_enter(&stp->sd_lock);
632 stp->sd_flag |= STRHUP;
633 mutex_exit(&stp->sd_lock);
634
635 /*
636 * If the registered process or process group did not have an
637 * open instance of this stream then strclean would not be
638 * called. Thus at the time of closing all remaining siglist entries
639 * are removed.
640 */
641 if (stp->sd_siglist != NULL)
642 strcleanall(vp);
643
644 ASSERT(stp->sd_siglist == NULL);
645 ASSERT(stp->sd_sigflags == 0);
646
647 if (STRMATED(stp)) {
648 struct stdata *strmatep = stp->sd_mate;
649 int waited = 1;
650
651 STRLOCKMATES(stp);
652 while (waited) {
653 waited = 0;
654 while (stp->sd_flag & (STWOPEN|STRCLOSE|STRPLUMB)) {
655 mutex_exit(&strmatep->sd_lock);
656 cv_wait(&stp->sd_monitor, &stp->sd_lock);
657 mutex_exit(&stp->sd_lock);
658 STRLOCKMATES(stp);
659 waited = 1;
660 }
661 while (strmatep->sd_flag &
662 (STWOPEN|STRCLOSE|STRPLUMB)) {
663 mutex_exit(&stp->sd_lock);
664 cv_wait(&strmatep->sd_monitor,
665 &strmatep->sd_lock);
666 mutex_exit(&strmatep->sd_lock);
667 STRLOCKMATES(stp);
668 waited = 1;
669 }
670 }
671 stp->sd_flag |= STRCLOSE;
672 STRUNLOCKMATES(stp);
673 } else {
674 mutex_enter(&stp->sd_lock);
675 stp->sd_flag |= STRCLOSE;
676 mutex_exit(&stp->sd_lock);
677 }
678
679 ASSERT(qp->q_first == NULL); /* No more delayed write */
680
681 /* Check if an I_LINK was ever done on this stream */
682 if (stp->sd_flag & STRHASLINKS) {
683 netstack_t *ns;
684 str_stack_t *ss;
685
686 ns = netstack_find_by_cred(crp);
687 ASSERT(ns != NULL);
688 ss = ns->netstack_str;
689 ASSERT(ss != NULL);
690
691 (void) munlinkall(stp, LINKCLOSE|LINKNORMAL, crp, &rval, ss);
692 netstack_rele(ss->ss_netstack);
693 }
694
695 while (_SAMESTR(qp)) {
696 /*
697 * Holding sd_lock prevents q_next from changing in
698 * this stream.
699 */
700 mutex_enter(&stp->sd_lock);
701 if (!(flag & (FNDELAY|FNONBLOCK)) && (stp->sd_closetime > 0)) {
702
703 /*
704 * sleep until awakened by strwsrv() or timeout
705 */
706 for (;;) {
707 mutex_enter(QLOCK(qp->q_next));
708 if (!(qp->q_next->q_mblkcnt)) {
709 mutex_exit(QLOCK(qp->q_next));
710 break;
711 }
712 stp->sd_flag |= WSLEEP;
713
714 /* ensure strwsrv gets enabled */
715 qp->q_next->q_flag |= QWANTW;
716 mutex_exit(QLOCK(qp->q_next));
717 /* get out if we timed out or recv'd a signal */
718 if (str_cv_wait(&qp->q_wait, &stp->sd_lock,
719 stp->sd_closetime, 0) <= 0) {
720 break;
721 }
722 }
723 stp->sd_flag &= ~WSLEEP;
724 }
725 mutex_exit(&stp->sd_lock);
726
727 rmq = qp->q_next;
728 if (rmq->q_flag & QISDRV) {
729 ASSERT(!_SAMESTR(rmq));
730 wait_sq_svc(_RD(qp)->q_syncq);
731 }
732
733 qdetach(_RD(rmq), 1, flag, crp, B_FALSE);
734 }
735
736 /*
737 * Since we call pollwakeup in close() now, the poll list should
738 * be empty in most cases. The only exception is the layered devices
739 * (e.g. the console drivers with redirection modules pushed on top
740 * of it). We have to do this after calling qdetach() because
741 * the redirection module won't have torn down the console
742 * redirection until after qdetach() has been invoked.
743 */
744 if (stp->sd_pollist.ph_list != NULL) {
745 pollwakeup(&stp->sd_pollist, POLLERR);
746 pollhead_clean(&stp->sd_pollist);
747 }
748 ASSERT(stp->sd_pollist.ph_list == NULL);
749 ASSERT(stp->sd_sidp == NULL);
750 ASSERT(stp->sd_pgidp == NULL);
751
752 /* Prevent qenable from re-enabling the stream head queue */
753 disable_svc(_RD(qp));
754
755 /*
756 * Wait until service procedure of each queue is
757 * run, if QINSERVICE is set.
758 */
759 wait_svc(_RD(qp));
760
761 /*
762 * Now, flush both queues.
763 */
764 flushq(_RD(qp), FLUSHALL);
765 flushq(qp, FLUSHALL);
766
767 /*
768 * If the write queue of the stream head is pointing to a
769 * read queue, we have a twisted stream. If the read queue
770 * is alive, convert the stream head queues into a dead end.
771 * If the read queue is dead, free the dead pair.
772 */
773 if (qp->q_next && !_SAMESTR(qp)) {
774 if (qp->q_next->q_qinfo == &deadrend) { /* half-closed pipe */
775 flushq(qp->q_next, FLUSHALL); /* ensure no message */
776 shfree(qp->q_next->q_stream);
777 freeq(qp->q_next);
778 freeq(_RD(qp));
779 } else if (qp->q_next == _RD(qp)) { /* fifo */
780 freeq(_RD(qp));
781 } else { /* pipe */
782 freestp = 0;
783 /*
784 * The q_info pointers are never accessed when
785 * SQLOCK is held.
786 */
787 ASSERT(qp->q_syncq == _RD(qp)->q_syncq);
788 mutex_enter(SQLOCK(qp->q_syncq));
789 qp->q_qinfo = &deadwend;
790 _RD(qp)->q_qinfo = &deadrend;
791 mutex_exit(SQLOCK(qp->q_syncq));
792 }
793 } else {
794 freeq(_RD(qp)); /* free stream head queue pair */
795 }
796
797 mutex_enter(&vp->v_lock);
798 if (stp->sd_iocblk) {
799 if (stp->sd_iocblk != (mblk_t *)-1) {
800 freemsg(stp->sd_iocblk);
801 }
802 stp->sd_iocblk = NULL;
803 }
804 stp->sd_vnode = NULL;
805 vp->v_stream = NULL;
806 mutex_exit(&vp->v_lock);
807 mutex_enter(&stp->sd_lock);
808 freemsg(stp->sd_cmdblk);
809 stp->sd_cmdblk = NULL;
810 stp->sd_flag &= ~STRCLOSE;
811 cv_broadcast(&stp->sd_monitor);
812 mutex_exit(&stp->sd_lock);
813
814 if (freestp)
815 shfree(stp);
816 return (0);
817 }
818
819 static int
820 strsink(queue_t *q, mblk_t *bp)
821 {
822 struct copyresp *resp;
823
824 switch (bp->b_datap->db_type) {
825 case M_FLUSH:
826 if ((*bp->b_rptr & FLUSHW) && !(bp->b_flag & MSGNOLOOP)) {
827 *bp->b_rptr &= ~FLUSHR;
828 bp->b_flag |= MSGNOLOOP;
829 /*
830 * Protect against the driver passing up
831 * messages after it has done a qprocsoff.
832 */
833 if (_OTHERQ(q)->q_next == NULL)
834 freemsg(bp);
835 else
836 qreply(q, bp);
837 } else {
838 freemsg(bp);
839 }
840 break;
841
842 case M_COPYIN:
843 case M_COPYOUT:
844 if (bp->b_cont) {
845 freemsg(bp->b_cont);
846 bp->b_cont = NULL;
847 }
848 bp->b_datap->db_type = M_IOCDATA;
849 bp->b_wptr = bp->b_rptr + sizeof (struct copyresp);
850 resp = (struct copyresp *)bp->b_rptr;
851 resp->cp_rval = (caddr_t)1; /* failure */
852 /*
853 * Protect against the driver passing up
854 * messages after it has done a qprocsoff.
855 */
856 if (_OTHERQ(q)->q_next == NULL)
857 freemsg(bp);
858 else
859 qreply(q, bp);
860 break;
861
862 case M_IOCTL:
863 if (bp->b_cont) {
864 freemsg(bp->b_cont);
865 bp->b_cont = NULL;
866 }
867 bp->b_datap->db_type = M_IOCNAK;
868 /*
869 * Protect against the driver passing up
870 * messages after it has done a qprocsoff.
871 */
872 if (_OTHERQ(q)->q_next == NULL)
873 freemsg(bp);
874 else
875 qreply(q, bp);
876 break;
877
878 default:
879 freemsg(bp);
880 break;
881 }
882
883 return (0);
884 }
885
886 /*
887 * Clean up after a process when it closes a stream. This is called
888 * from closef for all closes, whereas strclose is called only for the
889 * last close on a stream. The siglist is scanned for entries for the
890 * current process, and these are removed.
891 */
892 void
893 strclean(struct vnode *vp)
894 {
895 strsig_t *ssp, *pssp, *tssp;
896 stdata_t *stp;
897 int update = 0;
898
899 TRACE_1(TR_FAC_STREAMS_FR,
900 TR_STRCLEAN, "strclean:%p", vp);
901 stp = vp->v_stream;
902 pssp = NULL;
903 mutex_enter(&stp->sd_lock);
904 ssp = stp->sd_siglist;
905 while (ssp) {
906 if (ssp->ss_pidp == curproc->p_pidp) {
907 tssp = ssp->ss_next;
908 if (pssp)
909 pssp->ss_next = tssp;
910 else
911 stp->sd_siglist = tssp;
912 mutex_enter(&pidlock);
913 PID_RELE(ssp->ss_pidp);
914 mutex_exit(&pidlock);
915 kmem_free(ssp, sizeof (strsig_t));
916 update = 1;
917 ssp = tssp;
918 } else {
919 pssp = ssp;
920 ssp = ssp->ss_next;
921 }
922 }
923 if (update) {
924 stp->sd_sigflags = 0;
925 for (ssp = stp->sd_siglist; ssp; ssp = ssp->ss_next)
926 stp->sd_sigflags |= ssp->ss_events;
927 }
928 mutex_exit(&stp->sd_lock);
929 }
930
931 /*
932 * Used on the last close to remove any remaining items on the siglist.
933 * These could be present on the siglist due to I_ESETSIG calls that
934 * use process groups or processed that do not have an open file descriptor
935 * for this stream (Such entries would not be removed by strclean).
936 */
937 static void
938 strcleanall(struct vnode *vp)
939 {
940 strsig_t *ssp, *nssp;
941 stdata_t *stp;
942
943 stp = vp->v_stream;
944 mutex_enter(&stp->sd_lock);
945 ssp = stp->sd_siglist;
946 stp->sd_siglist = NULL;
947 while (ssp) {
948 nssp = ssp->ss_next;
949 mutex_enter(&pidlock);
950 PID_RELE(ssp->ss_pidp);
951 mutex_exit(&pidlock);
952 kmem_free(ssp, sizeof (strsig_t));
953 ssp = nssp;
954 }
955 stp->sd_sigflags = 0;
956 mutex_exit(&stp->sd_lock);
957 }
958
959 /*
960 * Retrieve the next message from the logical stream head read queue
961 * using either rwnext (if sync stream) or getq_noenab.
962 * It is the callers responsibility to call qbackenable after
963 * it is finished with the message. The caller should not call
964 * qbackenable until after any putback calls to avoid spurious backenabling.
965 */
966 mblk_t *
967 strget(struct stdata *stp, queue_t *q, struct uio *uiop, int first,
968 int *errorp)
969 {
970 mblk_t *bp;
971 int error;
972 ssize_t rbytes = 0;
973
974 /* Holding sd_lock prevents the read queue from changing */
975 ASSERT(MUTEX_HELD(&stp->sd_lock));
976
977 if (uiop != NULL && stp->sd_struiordq != NULL &&
978 q->q_first == NULL &&
979 (!first || (stp->sd_wakeq & RSLEEP))) {
980 /*
981 * Stream supports rwnext() for the read side.
982 * If this is the first time we're called by e.g. strread
983 * only do the downcall if there is a deferred wakeup
984 * (registered in sd_wakeq).
985 */
986 struiod_t uiod;
987
988 if (first)
989 stp->sd_wakeq &= ~RSLEEP;
990
991 (void) uiodup(uiop, &uiod.d_uio, uiod.d_iov,
992 sizeof (uiod.d_iov) / sizeof (*uiod.d_iov));
993 uiod.d_mp = 0;
994 /*
995 * Mark that a thread is in rwnext on the read side
996 * to prevent strrput from nacking ioctls immediately.
997 * When the last concurrent rwnext returns
998 * the ioctls are nack'ed.
999 */
1000 ASSERT(MUTEX_HELD(&stp->sd_lock));
1001 stp->sd_struiodnak++;
1002 /*
1003 * Note: rwnext will drop sd_lock.
1004 */
1005 error = rwnext(q, &uiod);
1006 ASSERT(MUTEX_NOT_HELD(&stp->sd_lock));
1007 mutex_enter(&stp->sd_lock);
1008 stp->sd_struiodnak--;
1009 while (stp->sd_struiodnak == 0 &&
1010 ((bp = stp->sd_struionak) != NULL)) {
1011 stp->sd_struionak = bp->b_next;
1012 bp->b_next = NULL;
1013 bp->b_datap->db_type = M_IOCNAK;
1014 /*
1015 * Protect against the driver passing up
1016 * messages after it has done a qprocsoff.
1017 */
1018 if (_OTHERQ(q)->q_next == NULL)
1019 freemsg(bp);
1020 else {
1021 mutex_exit(&stp->sd_lock);
1022 qreply(q, bp);
1023 mutex_enter(&stp->sd_lock);
1024 }
1025 }
1026 ASSERT(MUTEX_HELD(&stp->sd_lock));
1027 if (error == 0 || error == EWOULDBLOCK) {
1028 if ((bp = uiod.d_mp) != NULL) {
1029 *errorp = 0;
1030 ASSERT(MUTEX_HELD(&stp->sd_lock));
1031 return (bp);
1032 }
1033 error = 0;
1034 } else if (error == EINVAL) {
1035 /*
1036 * The stream plumbing must have
1037 * changed while we were away, so
1038 * just turn off rwnext()s.
1039 */
1040 error = 0;
1041 } else if (error == EBUSY) {
1042 /*
1043 * The module might have data in transit using putnext
1044 * Fall back on waiting + getq.
1045 */
1046 error = 0;
1047 } else {
1048 *errorp = error;
1049 ASSERT(MUTEX_HELD(&stp->sd_lock));
1050 return (NULL);
1051 }
1052 /*
1053 * Try a getq in case a rwnext() generated mblk
1054 * has bubbled up via strrput().
1055 */
1056 }
1057 *errorp = 0;
1058 ASSERT(MUTEX_HELD(&stp->sd_lock));
1059
1060 /*
1061 * If we have a valid uio, try and use this as a guide for how
1062 * many bytes to retrieve from the queue via getq_noenab().
1063 * Doing this can avoid unneccesary counting of overlong
1064 * messages in putback(). We currently only do this for sockets
1065 * and only if there is no sd_rputdatafunc hook.
1066 *
1067 * The sd_rputdatafunc hook transforms the entire message
1068 * before any bytes in it can be given to a client. So, rbytes
1069 * must be 0 if there is a hook.
1070 */
1071 if ((uiop != NULL) && (stp->sd_vnode->v_type == VSOCK) &&
1072 (stp->sd_rputdatafunc == NULL))
1073 rbytes = uiop->uio_resid;
1074
1075 return (getq_noenab(q, rbytes));
1076 }
1077
1078 /*
1079 * Copy out the message pointed to by `bp' into the uio pointed to by `uiop'.
1080 * If the message does not fit in the uio the remainder of it is returned;
1081 * otherwise NULL is returned. Any embedded zero-length mblk_t's are
1082 * consumed, even if uio_resid reaches zero. On error, `*errorp' is set to
1083 * the error code, the message is consumed, and NULL is returned.
1084 */
1085 static mblk_t *
1086 struiocopyout(mblk_t *bp, struct uio *uiop, int *errorp)
1087 {
1088 int error;
1089 ptrdiff_t n;
1090 mblk_t *nbp;
1091
1092 ASSERT(bp->b_wptr >= bp->b_rptr);
1093
1094 do {
1095 if ((n = MIN(uiop->uio_resid, MBLKL(bp))) != 0) {
1096 ASSERT(n > 0);
1097
1098 error = uiomove(bp->b_rptr, n, UIO_READ, uiop);
1099 if (error != 0) {
1100 freemsg(bp);
1101 *errorp = error;
1102 return (NULL);
1103 }
1104 }
1105
1106 bp->b_rptr += n;
1107 while (bp != NULL && (bp->b_rptr >= bp->b_wptr)) {
1108 nbp = bp;
1109 bp = bp->b_cont;
1110 freeb(nbp);
1111 }
1112 } while (bp != NULL && uiop->uio_resid > 0);
1113
1114 *errorp = 0;
1115 return (bp);
1116 }
1117
1118 /*
1119 * Read a stream according to the mode flags in sd_flag:
1120 *
1121 * (default mode) - Byte stream, msg boundaries are ignored
1122 * RD_MSGDIS (msg discard) - Read on msg boundaries and throw away
1123 * any data remaining in msg
1124 * RD_MSGNODIS (msg non-discard) - Read on msg boundaries and put back
1125 * any remaining data on head of read queue
1126 *
1127 * Consume readable messages on the front of the queue until
1128 * ttolwp(curthread)->lwp_count
1129 * is satisfied, the readable messages are exhausted, or a message
1130 * boundary is reached in a message mode. If no data was read and
1131 * the stream was not opened with the NDELAY flag, block until data arrives.
1132 * Otherwise return the data read and update the count.
1133 *
1134 * In default mode a 0 length message signifies end-of-file and terminates
1135 * a read in progress. The 0 length message is removed from the queue
1136 * only if it is the only message read (no data is read).
1137 *
1138 * An attempt to read an M_PROTO or M_PCPROTO message results in an
1139 * EBADMSG error return, unless either RD_PROTDAT or RD_PROTDIS are set.
1140 * If RD_PROTDAT is set, M_PROTO and M_PCPROTO messages are read as data.
1141 * If RD_PROTDIS is set, the M_PROTO and M_PCPROTO parts of the message
1142 * are unlinked from and M_DATA blocks in the message, the protos are
1143 * thrown away, and the data is read.
1144 */
1145 /* ARGSUSED */
1146 int
1147 strread(struct vnode *vp, struct uio *uiop, cred_t *crp)
1148 {
1149 struct stdata *stp;
1150 mblk_t *bp, *nbp;
1151 queue_t *q;
1152 int error = 0;
1153 uint_t old_sd_flag;
1154 int first;
1155 char rflg;
1156 uint_t mark; /* Contains MSG*MARK and _LASTMARK */
1157 #define _LASTMARK 0x8000 /* Distinct from MSG*MARK */
1158 short delim;
1159 unsigned char pri = 0;
1160 char waitflag;
1161 unsigned char type;
1162
1163 TRACE_1(TR_FAC_STREAMS_FR,
1164 TR_STRREAD_ENTER, "strread:%p", vp);
1165 ASSERT(vp->v_stream);
1166 stp = vp->v_stream;
1167
1168 mutex_enter(&stp->sd_lock);
1169
1170 if ((error = i_straccess(stp, JCREAD)) != 0) {
1171 mutex_exit(&stp->sd_lock);
1172 return (error);
1173 }
1174
1175 if (stp->sd_flag & (STRDERR|STPLEX)) {
1176 error = strgeterr(stp, STRDERR|STPLEX, 0);
1177 if (error != 0) {
1178 mutex_exit(&stp->sd_lock);
1179 return (error);
1180 }
1181 }
1182
1183 /*
1184 * Loop terminates when uiop->uio_resid == 0.
1185 */
1186 rflg = 0;
1187 waitflag = READWAIT;
1188 q = _RD(stp->sd_wrq);
1189 for (;;) {
1190 ASSERT(MUTEX_HELD(&stp->sd_lock));
1191 old_sd_flag = stp->sd_flag;
1192 mark = 0;
1193 delim = 0;
1194 first = 1;
1195 while ((bp = strget(stp, q, uiop, first, &error)) == NULL) {
1196 int done = 0;
1197
1198 ASSERT(MUTEX_HELD(&stp->sd_lock));
1199
1200 if (error != 0)
1201 goto oops;
1202
1203 if (stp->sd_flag & (STRHUP|STREOF)) {
1204 goto oops;
1205 }
1206 if (rflg && !(stp->sd_flag & STRDELIM)) {
1207 goto oops;
1208 }
1209 /*
1210 * If a read(fd,buf,0) has been done, there is no
1211 * need to sleep. We always have zero bytes to
1212 * return.
1213 */
1214 if (uiop->uio_resid == 0) {
1215 goto oops;
1216 }
1217
1218 qbackenable(q, 0);
1219
1220 TRACE_3(TR_FAC_STREAMS_FR, TR_STRREAD_WAIT,
1221 "strread calls strwaitq:%p, %p, %p",
1222 vp, uiop, crp);
1223 if ((error = strwaitq(stp, waitflag, uiop->uio_resid,
1224 uiop->uio_fmode, -1, &done)) != 0 || done) {
1225 TRACE_3(TR_FAC_STREAMS_FR, TR_STRREAD_DONE,
1226 "strread error or done:%p, %p, %p",
1227 vp, uiop, crp);
1228 if ((uiop->uio_fmode & FNDELAY) &&
1229 (stp->sd_flag & OLDNDELAY) &&
1230 (error == EAGAIN))
1231 error = 0;
1232 goto oops;
1233 }
1234 TRACE_3(TR_FAC_STREAMS_FR, TR_STRREAD_AWAKE,
1235 "strread awakes:%p, %p, %p", vp, uiop, crp);
1236 if ((error = i_straccess(stp, JCREAD)) != 0) {
1237 goto oops;
1238 }
1239 first = 0;
1240 }
1241
1242 ASSERT(MUTEX_HELD(&stp->sd_lock));
1243 ASSERT(bp);
1244 pri = bp->b_band;
1245 /*
1246 * Extract any mark information. If the message is not
1247 * completely consumed this information will be put in the mblk
1248 * that is putback.
1249 * If MSGMARKNEXT is set and the message is completely consumed
1250 * the STRATMARK flag will be set below. Likewise, if
1251 * MSGNOTMARKNEXT is set and the message is
1252 * completely consumed STRNOTATMARK will be set.
1253 *
1254 * For some unknown reason strread only breaks the read at the
1255 * last mark.
1256 */
1257 mark = bp->b_flag & (MSGMARK | MSGMARKNEXT | MSGNOTMARKNEXT);
1258 ASSERT((mark & (MSGMARKNEXT|MSGNOTMARKNEXT)) !=
1259 (MSGMARKNEXT|MSGNOTMARKNEXT));
1260 if (mark != 0 && bp == stp->sd_mark) {
1261 if (rflg) {
1262 putback(stp, q, bp, pri);
1263 goto oops;
1264 }
1265 mark |= _LASTMARK;
1266 stp->sd_mark = NULL;
1267 }
1268 if ((stp->sd_flag & STRDELIM) && (bp->b_flag & MSGDELIM))
1269 delim = 1;
1270 mutex_exit(&stp->sd_lock);
1271
1272 if (STREAM_NEEDSERVICE(stp))
1273 stream_runservice(stp);
1274
1275 type = bp->b_datap->db_type;
1276
1277 switch (type) {
1278
1279 case M_DATA:
1280 ismdata:
1281 if (msgnodata(bp)) {
1282 if (mark || delim) {
1283 freemsg(bp);
1284 } else if (rflg) {
1285
1286 /*
1287 * If already read data put zero
1288 * length message back on queue else
1289 * free msg and return 0.
1290 */
1291 bp->b_band = pri;
1292 mutex_enter(&stp->sd_lock);
1293 putback(stp, q, bp, pri);
1294 mutex_exit(&stp->sd_lock);
1295 } else {
1296 freemsg(bp);
1297 }
1298 error = 0;
1299 goto oops1;
1300 }
1301
1302 rflg = 1;
1303 waitflag |= NOINTR;
1304 bp = struiocopyout(bp, uiop, &error);
1305 if (error != 0)
1306 goto oops1;
1307
1308 mutex_enter(&stp->sd_lock);
1309 if (bp) {
1310 /*
1311 * Have remaining data in message.
1312 * Free msg if in discard mode.
1313 */
1314 if (stp->sd_read_opt & RD_MSGDIS) {
1315 freemsg(bp);
1316 } else {
1317 bp->b_band = pri;
1318 if ((mark & _LASTMARK) &&
1319 (stp->sd_mark == NULL))
1320 stp->sd_mark = bp;
1321 bp->b_flag |= mark & ~_LASTMARK;
1322 if (delim)
1323 bp->b_flag |= MSGDELIM;
1324 if (msgnodata(bp))
1325 freemsg(bp);
1326 else
1327 putback(stp, q, bp, pri);
1328 }
1329 } else {
1330 /*
1331 * Consumed the complete message.
1332 * Move the MSG*MARKNEXT information
1333 * to the stream head just in case
1334 * the read queue becomes empty.
1335 *
1336 * If the stream head was at the mark
1337 * (STRATMARK) before we dropped sd_lock above
1338 * and some data was consumed then we have
1339 * moved past the mark thus STRATMARK is
1340 * cleared. However, if a message arrived in
1341 * strrput during the copyout above causing
1342 * STRATMARK to be set we can not clear that
1343 * flag.
1344 */
1345 if (mark &
1346 (MSGMARKNEXT|MSGNOTMARKNEXT|MSGMARK)) {
1347 if (mark & MSGMARKNEXT) {
1348 stp->sd_flag &= ~STRNOTATMARK;
1349 stp->sd_flag |= STRATMARK;
1350 } else if (mark & MSGNOTMARKNEXT) {
1351 stp->sd_flag &= ~STRATMARK;
1352 stp->sd_flag |= STRNOTATMARK;
1353 } else {
1354 stp->sd_flag &=
1355 ~(STRATMARK|STRNOTATMARK);
1356 }
1357 } else if (rflg && (old_sd_flag & STRATMARK)) {
1358 stp->sd_flag &= ~STRATMARK;
1359 }
1360 }
1361
1362 /*
1363 * Check for signal messages at the front of the read
1364 * queue and generate the signal(s) if appropriate.
1365 * The only signal that can be on queue is M_SIG at
1366 * this point.
1367 */
1368 while ((((bp = q->q_first)) != NULL) &&
1369 (bp->b_datap->db_type == M_SIG)) {
1370 bp = getq_noenab(q, 0);
1371 /*
1372 * sd_lock is held so the content of the
1373 * read queue can not change.
1374 */
1375 ASSERT(bp != NULL && DB_TYPE(bp) == M_SIG);
1376 strsignal_nolock(stp, *bp->b_rptr, bp->b_band);
1377 mutex_exit(&stp->sd_lock);
1378 freemsg(bp);
1379 if (STREAM_NEEDSERVICE(stp))
1380 stream_runservice(stp);
1381 mutex_enter(&stp->sd_lock);
1382 }
1383
1384 if ((uiop->uio_resid == 0) || (mark & _LASTMARK) ||
1385 delim ||
1386 (stp->sd_read_opt & (RD_MSGDIS|RD_MSGNODIS))) {
1387 goto oops;
1388 }
1389 continue;
1390
1391 case M_SIG:
1392 strsignal(stp, *bp->b_rptr, (int32_t)bp->b_band);
1393 freemsg(bp);
1394 mutex_enter(&stp->sd_lock);
1395 continue;
1396
1397 case M_PROTO:
1398 case M_PCPROTO:
1399 /*
1400 * Only data messages are readable.
1401 * Any others generate an error, unless
1402 * RD_PROTDIS or RD_PROTDAT is set.
1403 */
1404 if (stp->sd_read_opt & RD_PROTDAT) {
1405 for (nbp = bp; nbp; nbp = nbp->b_next) {
1406 if ((nbp->b_datap->db_type ==
1407 M_PROTO) ||
1408 (nbp->b_datap->db_type ==
1409 M_PCPROTO)) {
1410 nbp->b_datap->db_type = M_DATA;
1411 } else {
1412 break;
1413 }
1414 }
1415 /*
1416 * clear stream head hi pri flag based on
1417 * first message
1418 */
1419 if (type == M_PCPROTO) {
1420 mutex_enter(&stp->sd_lock);
1421 stp->sd_flag &= ~STRPRI;
1422 mutex_exit(&stp->sd_lock);
1423 }
1424 goto ismdata;
1425 } else if (stp->sd_read_opt & RD_PROTDIS) {
1426 /*
1427 * discard non-data messages
1428 */
1429 while (bp &&
1430 ((bp->b_datap->db_type == M_PROTO) ||
1431 (bp->b_datap->db_type == M_PCPROTO))) {
1432 nbp = unlinkb(bp);
1433 freeb(bp);
1434 bp = nbp;
1435 }
1436 /*
1437 * clear stream head hi pri flag based on
1438 * first message
1439 */
1440 if (type == M_PCPROTO) {
1441 mutex_enter(&stp->sd_lock);
1442 stp->sd_flag &= ~STRPRI;
1443 mutex_exit(&stp->sd_lock);
1444 }
1445 if (bp) {
1446 bp->b_band = pri;
1447 goto ismdata;
1448 } else {
1449 break;
1450 }
1451 }
1452 /* FALLTHRU */
1453 case M_PASSFP:
1454 if ((bp->b_datap->db_type == M_PASSFP) &&
1455 (stp->sd_read_opt & RD_PROTDIS)) {
1456 freemsg(bp);
1457 break;
1458 }
1459 mutex_enter(&stp->sd_lock);
1460 putback(stp, q, bp, pri);
1461 mutex_exit(&stp->sd_lock);
1462 if (rflg == 0)
1463 error = EBADMSG;
1464 goto oops1;
1465
1466 default:
1467 /*
1468 * Garbage on stream head read queue.
1469 */
1470 cmn_err(CE_WARN, "bad %x found at stream head\n",
1471 bp->b_datap->db_type);
1472 freemsg(bp);
1473 goto oops1;
1474 }
1475 mutex_enter(&stp->sd_lock);
1476 }
1477 oops:
1478 mutex_exit(&stp->sd_lock);
1479 oops1:
1480 qbackenable(q, pri);
1481 return (error);
1482 #undef _LASTMARK
1483 }
1484
1485 /*
1486 * Default processing of M_PROTO/M_PCPROTO messages.
1487 * Determine which wakeups and signals are needed.
1488 * This can be replaced by a user-specified procedure for kernel users
1489 * of STREAMS.
1490 */
1491 /* ARGSUSED */
1492 mblk_t *
1493 strrput_proto(vnode_t *vp, mblk_t *mp,
1494 strwakeup_t *wakeups, strsigset_t *firstmsgsigs,
1495 strsigset_t *allmsgsigs, strpollset_t *pollwakeups)
1496 {
1497 *wakeups = RSLEEP;
1498 *allmsgsigs = 0;
1499
1500 switch (mp->b_datap->db_type) {
1501 case M_PROTO:
1502 if (mp->b_band == 0) {
1503 *firstmsgsigs = S_INPUT | S_RDNORM;
1504 *pollwakeups = POLLIN | POLLRDNORM;
1505 } else {
1506 *firstmsgsigs = S_INPUT | S_RDBAND;
1507 *pollwakeups = POLLIN | POLLRDBAND;
1508 }
1509 break;
1510 case M_PCPROTO:
1511 *firstmsgsigs = S_HIPRI;
1512 *pollwakeups = POLLPRI;
1513 break;
1514 }
1515 return (mp);
1516 }
1517
1518 /*
1519 * Default processing of everything but M_DATA, M_PROTO, M_PCPROTO and
1520 * M_PASSFP messages.
1521 * Determine which wakeups and signals are needed.
1522 * This can be replaced by a user-specified procedure for kernel users
1523 * of STREAMS.
1524 */
1525 /* ARGSUSED */
1526 mblk_t *
1527 strrput_misc(vnode_t *vp, mblk_t *mp,
1528 strwakeup_t *wakeups, strsigset_t *firstmsgsigs,
1529 strsigset_t *allmsgsigs, strpollset_t *pollwakeups)
1530 {
1531 *wakeups = 0;
1532 *firstmsgsigs = 0;
1533 *allmsgsigs = 0;
1534 *pollwakeups = 0;
1535 return (mp);
1536 }
1537
1538 /*
1539 * Stream read put procedure. Called from downstream driver/module
1540 * with messages for the stream head. Data, protocol, and in-stream
1541 * signal messages are placed on the queue, others are handled directly.
1542 */
1543 int
1544 strrput(queue_t *q, mblk_t *bp)
1545 {
1546 struct stdata *stp;
1547 ulong_t rput_opt;
1548 strwakeup_t wakeups;
1549 strsigset_t firstmsgsigs; /* Signals if first message on queue */
1550 strsigset_t allmsgsigs; /* Signals for all messages */
1551 strsigset_t signals; /* Signals events to generate */
1552 strpollset_t pollwakeups;
1553 mblk_t *nextbp;
1554 uchar_t band = 0;
1555 int hipri_sig;
1556
1557 stp = (struct stdata *)q->q_ptr;
1558 /*
1559 * Use rput_opt for optimized access to the SR_ flags except
1560 * SR_POLLIN. That flag has to be checked under sd_lock since it
1561 * is modified by strpoll().
1562 */
1563 rput_opt = stp->sd_rput_opt;
1564
1565 ASSERT(qclaimed(q));
1566 TRACE_2(TR_FAC_STREAMS_FR, TR_STRRPUT_ENTER,
1567 "strrput called with message type:q %p bp %p", q, bp);
1568
1569 /*
1570 * Perform initial processing and pass to the parameterized functions.
1571 */
1572 ASSERT(bp->b_next == NULL);
1573
1574 switch (bp->b_datap->db_type) {
1575 case M_DATA:
1576 /*
1577 * sockfs is the only consumer of STREOF and when it is set,
1578 * it implies that the receiver is not interested in receiving
1579 * any more data, hence the mblk is freed to prevent unnecessary
1580 * message queueing at the stream head.
1581 */
1582 if (stp->sd_flag == STREOF) {
1583 freemsg(bp);
1584 return (0);
1585 }
1586 if ((rput_opt & SR_IGN_ZEROLEN) &&
1587 bp->b_rptr == bp->b_wptr && msgnodata(bp)) {
1588 /*
1589 * Ignore zero-length M_DATA messages. These might be
1590 * generated by some transports.
1591 * The zero-length M_DATA messages, even if they
1592 * are ignored, should effect the atmark tracking and
1593 * should wake up a thread sleeping in strwaitmark.
1594 */
1595 mutex_enter(&stp->sd_lock);
1596 if (bp->b_flag & MSGMARKNEXT) {
1597 /*
1598 * Record the position of the mark either
1599 * in q_last or in STRATMARK.
1600 */
1601 if (q->q_last != NULL) {
1602 q->q_last->b_flag &= ~MSGNOTMARKNEXT;
1603 q->q_last->b_flag |= MSGMARKNEXT;
1604 } else {
1605 stp->sd_flag &= ~STRNOTATMARK;
1606 stp->sd_flag |= STRATMARK;
1607 }
1608 } else if (bp->b_flag & MSGNOTMARKNEXT) {
1609 /*
1610 * Record that this is not the position of
1611 * the mark either in q_last or in
1612 * STRNOTATMARK.
1613 */
1614 if (q->q_last != NULL) {
1615 q->q_last->b_flag &= ~MSGMARKNEXT;
1616 q->q_last->b_flag |= MSGNOTMARKNEXT;
1617 } else {
1618 stp->sd_flag &= ~STRATMARK;
1619 stp->sd_flag |= STRNOTATMARK;
1620 }
1621 }
1622 if (stp->sd_flag & RSLEEP) {
1623 stp->sd_flag &= ~RSLEEP;
1624 cv_broadcast(&q->q_wait);
1625 }
1626 mutex_exit(&stp->sd_lock);
1627 freemsg(bp);
1628 return (0);
1629 }
1630 wakeups = RSLEEP;
1631 if (bp->b_band == 0) {
1632 firstmsgsigs = S_INPUT | S_RDNORM;
1633 pollwakeups = POLLIN | POLLRDNORM;
1634 } else {
1635 firstmsgsigs = S_INPUT | S_RDBAND;
1636 pollwakeups = POLLIN | POLLRDBAND;
1637 }
1638 if (rput_opt & SR_SIGALLDATA)
1639 allmsgsigs = firstmsgsigs;
1640 else
1641 allmsgsigs = 0;
1642
1643 mutex_enter(&stp->sd_lock);
1644 if ((rput_opt & SR_CONSOL_DATA) &&
1645 (q->q_last != NULL) &&
1646 (bp->b_flag & (MSGMARK|MSGDELIM)) == 0) {
1647 /*
1648 * Consolidate an M_DATA message onto an M_DATA,
1649 * M_PROTO, or M_PCPROTO by merging it with q_last.
1650 * The consolidation does not take place if
1651 * the old message is marked with either of the
1652 * marks or the delim flag or if the new
1653 * message is marked with MSGMARK. The MSGMARK
1654 * check is needed to handle the odd semantics of
1655 * MSGMARK where essentially the whole message
1656 * is to be treated as marked.
1657 * Carry any MSGMARKNEXT and MSGNOTMARKNEXT from the
1658 * new message to the front of the b_cont chain.
1659 */
1660 mblk_t *lbp = q->q_last;
1661 unsigned char db_type = lbp->b_datap->db_type;
1662
1663 if ((db_type == M_DATA || db_type == M_PROTO ||
1664 db_type == M_PCPROTO) &&
1665 !(lbp->b_flag & (MSGDELIM|MSGMARK|MSGMARKNEXT))) {
1666 rmvq_noenab(q, lbp);
1667 /*
1668 * The first message in the b_cont list
1669 * tracks MSGMARKNEXT and MSGNOTMARKNEXT.
1670 * We need to handle the case where we
1671 * are appending:
1672 *
1673 * 1) a MSGMARKNEXT to a MSGNOTMARKNEXT.
1674 * 2) a MSGMARKNEXT to a plain message.
1675 * 3) a MSGNOTMARKNEXT to a plain message
1676 * 4) a MSGNOTMARKNEXT to a MSGNOTMARKNEXT
1677 * message.
1678 *
1679 * Thus we never append a MSGMARKNEXT or
1680 * MSGNOTMARKNEXT to a MSGMARKNEXT message.
1681 */
1682 if (bp->b_flag & MSGMARKNEXT) {
1683 lbp->b_flag |= MSGMARKNEXT;
1684 lbp->b_flag &= ~MSGNOTMARKNEXT;
1685 bp->b_flag &= ~MSGMARKNEXT;
1686 } else if (bp->b_flag & MSGNOTMARKNEXT) {
1687 lbp->b_flag |= MSGNOTMARKNEXT;
1688 bp->b_flag &= ~MSGNOTMARKNEXT;
1689 }
1690
1691 linkb(lbp, bp);
1692 bp = lbp;
1693 /*
1694 * The new message logically isn't the first
1695 * even though the q_first check below thinks
1696 * it is. Clear the firstmsgsigs to make it
1697 * not appear to be first.
1698 */
1699 firstmsgsigs = 0;
1700 }
1701 }
1702 break;
1703
1704 case M_PASSFP:
1705 wakeups = RSLEEP;
1706 allmsgsigs = 0;
1707 if (bp->b_band == 0) {
1708 firstmsgsigs = S_INPUT | S_RDNORM;
1709 pollwakeups = POLLIN | POLLRDNORM;
1710 } else {
1711 firstmsgsigs = S_INPUT | S_RDBAND;
1712 pollwakeups = POLLIN | POLLRDBAND;
1713 }
1714 mutex_enter(&stp->sd_lock);
1715 break;
1716
1717 case M_PROTO:
1718 case M_PCPROTO:
1719 ASSERT(stp->sd_rprotofunc != NULL);
1720 bp = (stp->sd_rprotofunc)(stp->sd_vnode, bp,
1721 &wakeups, &firstmsgsigs, &allmsgsigs, &pollwakeups);
1722 #define ALLSIG (S_INPUT|S_HIPRI|S_OUTPUT|S_MSG|S_ERROR|S_HANGUP|S_RDNORM|\
1723 S_WRNORM|S_RDBAND|S_WRBAND|S_BANDURG)
1724 #define ALLPOLL (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLWRNORM|POLLRDBAND|\
1725 POLLWRBAND)
1726
1727 ASSERT((wakeups & ~(RSLEEP|WSLEEP)) == 0);
1728 ASSERT((firstmsgsigs & ~ALLSIG) == 0);
1729 ASSERT((allmsgsigs & ~ALLSIG) == 0);
1730 ASSERT((pollwakeups & ~ALLPOLL) == 0);
1731
1732 mutex_enter(&stp->sd_lock);
1733 break;
1734
1735 default:
1736 ASSERT(stp->sd_rmiscfunc != NULL);
1737 bp = (stp->sd_rmiscfunc)(stp->sd_vnode, bp,
1738 &wakeups, &firstmsgsigs, &allmsgsigs, &pollwakeups);
1739 ASSERT((wakeups & ~(RSLEEP|WSLEEP)) == 0);
1740 ASSERT((firstmsgsigs & ~ALLSIG) == 0);
1741 ASSERT((allmsgsigs & ~ALLSIG) == 0);
1742 ASSERT((pollwakeups & ~ALLPOLL) == 0);
1743 #undef ALLSIG
1744 #undef ALLPOLL
1745 mutex_enter(&stp->sd_lock);
1746 break;
1747 }
1748 ASSERT(MUTEX_HELD(&stp->sd_lock));
1749
1750 /* By default generate superset of signals */
1751 signals = (firstmsgsigs | allmsgsigs);
1752
1753 /*
1754 * The proto and misc functions can return multiple messages
1755 * as a b_next chain. Such messages are processed separately.
1756 */
1757 one_more:
1758 hipri_sig = 0;
1759 if (bp == NULL) {
1760 nextbp = NULL;
1761 } else {
1762 nextbp = bp->b_next;
1763 bp->b_next = NULL;
1764
1765 switch (bp->b_datap->db_type) {
1766 case M_PCPROTO:
1767 /*
1768 * Only one priority protocol message is allowed at the
1769 * stream head at a time.
1770 */
1771 if (stp->sd_flag & STRPRI) {
1772 TRACE_0(TR_FAC_STREAMS_FR, TR_STRRPUT_PROTERR,
1773 "M_PCPROTO already at head");
1774 freemsg(bp);
1775 mutex_exit(&stp->sd_lock);
1776 goto done;
1777 }
1778 stp->sd_flag |= STRPRI;
1779 hipri_sig = 1;
1780 /* FALLTHRU */
1781 case M_DATA:
1782 case M_PROTO:
1783 case M_PASSFP:
1784 band = bp->b_band;
1785 /*
1786 * Marking doesn't work well when messages
1787 * are marked in more than one band. We only
1788 * remember the last message received, even if
1789 * it is placed on the queue ahead of other
1790 * marked messages.
1791 */
1792 if (bp->b_flag & MSGMARK)
1793 stp->sd_mark = bp;
1794 (void) putq(q, bp);
1795
1796 /*
1797 * If message is a PCPROTO message, always use
1798 * firstmsgsigs to determine if a signal should be
1799 * sent as strrput is the only place to send
1800 * signals for PCPROTO. Other messages are based on
1801 * the STRGETINPROG flag. The flag determines if
1802 * strrput or (k)strgetmsg will be responsible for
1803 * sending the signals, in the firstmsgsigs case.
1804 */
1805 if ((hipri_sig == 1) ||
1806 (((stp->sd_flag & STRGETINPROG) == 0) &&
1807 (q->q_first == bp)))
1808 signals = (firstmsgsigs | allmsgsigs);
1809 else
1810 signals = allmsgsigs;
1811 break;
1812
1813 default:
1814 mutex_exit(&stp->sd_lock);
1815 (void) strrput_nondata(q, bp);
1816 mutex_enter(&stp->sd_lock);
1817 break;
1818 }
1819 }
1820 ASSERT(MUTEX_HELD(&stp->sd_lock));
1821 /*
1822 * Wake sleeping read/getmsg and cancel deferred wakeup
1823 */
1824 if (wakeups & RSLEEP)
1825 stp->sd_wakeq &= ~RSLEEP;
1826
1827 wakeups &= stp->sd_flag;
1828 if (wakeups & RSLEEP) {
1829 stp->sd_flag &= ~RSLEEP;
1830 cv_broadcast(&q->q_wait);
1831 }
1832 if (wakeups & WSLEEP) {
1833 stp->sd_flag &= ~WSLEEP;
1834 cv_broadcast(&_WR(q)->q_wait);
1835 }
1836
1837 if (pollwakeups != 0) {
1838 if (pollwakeups == (POLLIN | POLLRDNORM)) {
1839 /*
1840 * Can't use rput_opt since it was not
1841 * read when sd_lock was held and SR_POLLIN is changed
1842 * by strpoll() under sd_lock.
1843 */
1844 if (!(stp->sd_rput_opt & SR_POLLIN))
1845 goto no_pollwake;
1846 stp->sd_rput_opt &= ~SR_POLLIN;
1847 }
1848 mutex_exit(&stp->sd_lock);
1849 pollwakeup(&stp->sd_pollist, pollwakeups);
1850 mutex_enter(&stp->sd_lock);
1851 }
1852 no_pollwake:
1853
1854 /*
1855 * strsendsig can handle multiple signals with a
1856 * single call.
1857 */
1858 if (stp->sd_sigflags & signals)
1859 strsendsig(stp->sd_siglist, signals, band, 0);
1860 mutex_exit(&stp->sd_lock);
1861
1862
1863 done:
1864 if (nextbp == NULL)
1865 return (0);
1866
1867 /*
1868 * Any signals were handled the first time.
1869 * Wakeups and pollwakeups are redone to avoid any race
1870 * conditions - all the messages are not queued until the
1871 * last message has been processed by strrput.
1872 */
1873 bp = nextbp;
1874 signals = firstmsgsigs = allmsgsigs = 0;
1875 mutex_enter(&stp->sd_lock);
1876 goto one_more;
1877 }
1878
1879 static void
1880 log_dupioc(queue_t *rq, mblk_t *bp)
1881 {
1882 queue_t *wq, *qp;
1883 char *modnames, *mnp, *dname;
1884 size_t maxmodstr;
1885 boolean_t islast;
1886
1887 /*
1888 * Allocate a buffer large enough to hold the names of nstrpush modules
1889 * and one driver, with spaces between and NUL terminator. If we can't
1890 * get memory, then we'll just log the driver name.
1891 */
1892 maxmodstr = nstrpush * (FMNAMESZ + 1);
1893 mnp = modnames = kmem_alloc(maxmodstr, KM_NOSLEEP);
1894
1895 /* march down write side to print log message down to the driver */
1896 wq = WR(rq);
1897
1898 /* make sure q_next doesn't shift around while we're grabbing data */
1899 claimstr(wq);
1900 qp = wq->q_next;
1901 do {
1902 dname = Q2NAME(qp);
1903 islast = !SAMESTR(qp) || qp->q_next == NULL;
1904 if (modnames == NULL) {
1905 /*
1906 * If we don't have memory, then get the driver name in
1907 * the log where we can see it. Note that memory
1908 * pressure is a possible cause of these sorts of bugs.
1909 */
1910 if (islast) {
1911 modnames = dname;
1912 maxmodstr = 0;
1913 }
1914 } else {
1915 mnp += snprintf(mnp, FMNAMESZ + 1, "%s", dname);
1916 if (!islast)
1917 *mnp++ = ' ';
1918 }
1919 qp = qp->q_next;
1920 } while (!islast);
1921 releasestr(wq);
1922 /* Cannot happen unless stream head is corrupt. */
1923 ASSERT(modnames != NULL);
1924 (void) strlog(rq->q_qinfo->qi_minfo->mi_idnum, 0, 1,
1925 SL_CONSOLE|SL_TRACE|SL_ERROR,
1926 "Warning: stream %p received duplicate %X M_IOC%s; module list: %s",
1927 rq->q_ptr, ((struct iocblk *)bp->b_rptr)->ioc_cmd,
1928 (DB_TYPE(bp) == M_IOCACK ? "ACK" : "NAK"), modnames);
1929 if (maxmodstr != 0)
1930 kmem_free(modnames, maxmodstr);
1931 }
1932
1933 int
1934 strrput_nondata(queue_t *q, mblk_t *bp)
1935 {
1936 struct stdata *stp;
1937 struct iocblk *iocbp;
1938 struct stroptions *sop;
1939 struct copyreq *reqp;
1940 struct copyresp *resp;
1941 unsigned char bpri;
1942 unsigned char flushed_already = 0;
1943
1944 stp = (struct stdata *)q->q_ptr;
1945
1946 ASSERT(!(stp->sd_flag & STPLEX));
1947 ASSERT(qclaimed(q));
1948
1949 switch (bp->b_datap->db_type) {
1950 case M_ERROR:
1951 /*
1952 * An error has occurred downstream, the errno is in the first
1953 * bytes of the message.
1954 */
1955 if ((bp->b_wptr - bp->b_rptr) == 2) { /* New flavor */
1956 unsigned char rw = 0;
1957
1958 mutex_enter(&stp->sd_lock);
1959 if (*bp->b_rptr != NOERROR) { /* read error */
1960 if (*bp->b_rptr != 0) {
1961 if (stp->sd_flag & STRDERR)
1962 flushed_already |= FLUSHR;
1963 stp->sd_flag |= STRDERR;
1964 rw |= FLUSHR;
1965 } else {
1966 stp->sd_flag &= ~STRDERR;
1967 }
1968 stp->sd_rerror = *bp->b_rptr;
1969 }
1970 bp->b_rptr++;
1971 if (*bp->b_rptr != NOERROR) { /* write error */
1972 if (*bp->b_rptr != 0) {
1973 if (stp->sd_flag & STWRERR)
1974 flushed_already |= FLUSHW;
1975 stp->sd_flag |= STWRERR;
1976 rw |= FLUSHW;
1977 } else {
1978 stp->sd_flag &= ~STWRERR;
1979 }
1980 stp->sd_werror = *bp->b_rptr;
1981 }
1982 if (rw) {
1983 TRACE_2(TR_FAC_STREAMS_FR, TR_STRRPUT_WAKE,
1984 "strrput cv_broadcast:q %p, bp %p",
1985 q, bp);
1986 cv_broadcast(&q->q_wait); /* readers */
1987 cv_broadcast(&_WR(q)->q_wait); /* writers */
1988 cv_broadcast(&stp->sd_monitor); /* ioctllers */
1989
1990 mutex_exit(&stp->sd_lock);
1991 pollwakeup(&stp->sd_pollist, POLLERR);
1992 mutex_enter(&stp->sd_lock);
1993
1994 if (stp->sd_sigflags & S_ERROR)
1995 strsendsig(stp->sd_siglist, S_ERROR, 0,
1996 ((rw & FLUSHR) ? stp->sd_rerror :
1997 stp->sd_werror));
1998 mutex_exit(&stp->sd_lock);
1999 /*
2000 * Send the M_FLUSH only
2001 * for the first M_ERROR
2002 * message on the stream
2003 */
2004 if (flushed_already == rw) {
2005 freemsg(bp);
2006 return (0);
2007 }
2008
2009 bp->b_datap->db_type = M_FLUSH;
2010 *bp->b_rptr = rw;
2011 bp->b_wptr = bp->b_rptr + 1;
2012 /*
2013 * Protect against the driver
2014 * passing up messages after
2015 * it has done a qprocsoff
2016 */
2017 if (_OTHERQ(q)->q_next == NULL)
2018 freemsg(bp);
2019 else
2020 qreply(q, bp);
2021 return (0);
2022 } else
2023 mutex_exit(&stp->sd_lock);
2024 } else if (*bp->b_rptr != 0) { /* Old flavor */
2025 if (stp->sd_flag & (STRDERR|STWRERR))
2026 flushed_already = FLUSHRW;
2027 mutex_enter(&stp->sd_lock);
2028 stp->sd_flag |= (STRDERR|STWRERR);
2029 stp->sd_rerror = *bp->b_rptr;
2030 stp->sd_werror = *bp->b_rptr;
2031 TRACE_2(TR_FAC_STREAMS_FR,
2032 TR_STRRPUT_WAKE2,
2033 "strrput wakeup #2:q %p, bp %p", q, bp);
2034 cv_broadcast(&q->q_wait); /* the readers */
2035 cv_broadcast(&_WR(q)->q_wait); /* the writers */
2036 cv_broadcast(&stp->sd_monitor); /* ioctllers */
2037
2038 mutex_exit(&stp->sd_lock);
2039 pollwakeup(&stp->sd_pollist, POLLERR);
2040 mutex_enter(&stp->sd_lock);
2041
2042 if (stp->sd_sigflags & S_ERROR)
2043 strsendsig(stp->sd_siglist, S_ERROR, 0,
2044 (stp->sd_werror ? stp->sd_werror :
2045 stp->sd_rerror));
2046 mutex_exit(&stp->sd_lock);
2047
2048 /*
2049 * Send the M_FLUSH only
2050 * for the first M_ERROR
2051 * message on the stream
2052 */
2053 if (flushed_already != FLUSHRW) {
2054 bp->b_datap->db_type = M_FLUSH;
2055 *bp->b_rptr = FLUSHRW;
2056 /*
2057 * Protect against the driver passing up
2058 * messages after it has done a
2059 * qprocsoff.
2060 */
2061 if (_OTHERQ(q)->q_next == NULL)
2062 freemsg(bp);
2063 else
2064 qreply(q, bp);
2065 return (0);
2066 }
2067 }
2068 freemsg(bp);
2069 return (0);
2070
2071 case M_HANGUP:
2072
2073 freemsg(bp);
2074 mutex_enter(&stp->sd_lock);
2075 stp->sd_werror = ENXIO;
2076 stp->sd_flag |= STRHUP;
2077 stp->sd_flag &= ~(WSLEEP|RSLEEP);
2078
2079 /*
2080 * send signal if controlling tty
2081 */
2082
2083 if (stp->sd_sidp) {
2084 prsignal(stp->sd_sidp, SIGHUP);
2085 if (stp->sd_sidp != stp->sd_pgidp)
2086 pgsignal(stp->sd_pgidp, SIGTSTP);
2087 }
2088
2089 /*
2090 * wake up read, write, and exception pollers and
2091 * reset wakeup mechanism.
2092 */
2093 cv_broadcast(&q->q_wait); /* the readers */
2094 cv_broadcast(&_WR(q)->q_wait); /* the writers */
2095 cv_broadcast(&stp->sd_monitor); /* the ioctllers */
2096 strhup(stp);
2097 mutex_exit(&stp->sd_lock);
2098 return (0);
2099
2100 case M_UNHANGUP:
2101 freemsg(bp);
2102 mutex_enter(&stp->sd_lock);
2103 stp->sd_werror = 0;
2104 stp->sd_flag &= ~STRHUP;
2105 mutex_exit(&stp->sd_lock);
2106 return (0);
2107
2108 case M_SIG:
2109 /*
2110 * Someone downstream wants to post a signal. The
2111 * signal to post is contained in the first byte of the
2112 * message. If the message would go on the front of
2113 * the queue, send a signal to the process group
2114 * (if not SIGPOLL) or to the siglist processes
2115 * (SIGPOLL). If something is already on the queue,
2116 * OR if we are delivering a delayed suspend (*sigh*
2117 * another "tty" hack) and there's no one sleeping already,
2118 * just enqueue the message.
2119 */
2120 mutex_enter(&stp->sd_lock);
2121 if (q->q_first || (*bp->b_rptr == SIGTSTP &&
2122 !(stp->sd_flag & RSLEEP))) {
2123 (void) putq(q, bp);
2124 mutex_exit(&stp->sd_lock);
2125 return (0);
2126 }
2127 mutex_exit(&stp->sd_lock);
2128 /* FALLTHRU */
2129
2130 case M_PCSIG:
2131 /*
2132 * Don't enqueue, just post the signal.
2133 */
2134 strsignal(stp, *bp->b_rptr, 0L);
2135 freemsg(bp);
2136 return (0);
2137
2138 case M_CMD:
2139 if (MBLKL(bp) != sizeof (cmdblk_t)) {
2140 freemsg(bp);
2141 return (0);
2142 }
2143
2144 mutex_enter(&stp->sd_lock);
2145 if (stp->sd_flag & STRCMDWAIT) {
2146 ASSERT(stp->sd_cmdblk == NULL);
2147 stp->sd_cmdblk = bp;
2148 cv_broadcast(&stp->sd_monitor);
2149 mutex_exit(&stp->sd_lock);
2150 } else {
2151 mutex_exit(&stp->sd_lock);
2152 freemsg(bp);
2153 }
2154 return (0);
2155
2156 case M_FLUSH:
2157 /*
2158 * Flush queues. The indication of which queues to flush
2159 * is in the first byte of the message. If the read queue
2160 * is specified, then flush it. If FLUSHBAND is set, just
2161 * flush the band specified by the second byte of the message.
2162 *
2163 * If a module has issued a M_SETOPT to not flush hi
2164 * priority messages off of the stream head, then pass this
2165 * flag into the flushq code to preserve such messages.
2166 */
2167
2168 if (*bp->b_rptr & FLUSHR) {
2169 mutex_enter(&stp->sd_lock);
2170 if (*bp->b_rptr & FLUSHBAND) {
2171 ASSERT((bp->b_wptr - bp->b_rptr) >= 2);
2172 flushband(q, *(bp->b_rptr + 1), FLUSHALL);
2173 } else
2174 flushq_common(q, FLUSHALL,
2175 stp->sd_read_opt & RFLUSHPCPROT);
2176 if ((q->q_first == NULL) ||
2177 (q->q_first->b_datap->db_type < QPCTL))
2178 stp->sd_flag &= ~STRPRI;
2179 else {
2180 ASSERT(stp->sd_flag & STRPRI);
2181 }
2182 mutex_exit(&stp->sd_lock);
2183 }
2184 if ((*bp->b_rptr & FLUSHW) && !(bp->b_flag & MSGNOLOOP)) {
2185 *bp->b_rptr &= ~FLUSHR;
2186 bp->b_flag |= MSGNOLOOP;
2187 /*
2188 * Protect against the driver passing up
2189 * messages after it has done a qprocsoff.
2190 */
2191 if (_OTHERQ(q)->q_next == NULL)
2192 freemsg(bp);
2193 else
2194 qreply(q, bp);
2195 return (0);
2196 }
2197 freemsg(bp);
2198 return (0);
2199
2200 case M_IOCACK:
2201 case M_IOCNAK:
2202 iocbp = (struct iocblk *)bp->b_rptr;
2203 /*
2204 * If not waiting for ACK or NAK then just free msg.
2205 * If incorrect id sequence number then just free msg.
2206 * If already have ACK or NAK for user then this is a
2207 * duplicate, display a warning and free the msg.
2208 */
2209 mutex_enter(&stp->sd_lock);
2210 if ((stp->sd_flag & IOCWAIT) == 0 || stp->sd_iocblk ||
2211 (stp->sd_iocid != iocbp->ioc_id)) {
2212 /*
2213 * If the ACK/NAK is a dup, display a message
2214 * Dup is when sd_iocid == ioc_id, and
2215 * sd_iocblk == <valid ptr> or -1 (the former
2216 * is when an ioctl has been put on the stream
2217 * head, but has not yet been consumed, the
2218 * later is when it has been consumed).
2219 */
2220 if ((stp->sd_iocid == iocbp->ioc_id) &&
2221 (stp->sd_iocblk != NULL)) {
2222 log_dupioc(q, bp);
2223 }
2224 freemsg(bp);
2225 mutex_exit(&stp->sd_lock);
2226 return (0);
2227 }
2228
2229 /*
2230 * Assign ACK or NAK to user and wake up.
2231 */
2232 stp->sd_iocblk = bp;
2233 cv_broadcast(&stp->sd_monitor);
2234 mutex_exit(&stp->sd_lock);
2235 return (0);
2236
2237 case M_COPYIN:
2238 case M_COPYOUT:
2239 reqp = (struct copyreq *)bp->b_rptr;
2240
2241 /*
2242 * If not waiting for ACK or NAK then just fail request.
2243 * If already have ACK, NAK, or copy request, then just
2244 * fail request.
2245 * If incorrect id sequence number then just fail request.
2246 */
2247 mutex_enter(&stp->sd_lock);
2248 if ((stp->sd_flag & IOCWAIT) == 0 || stp->sd_iocblk ||
2249 (stp->sd_iocid != reqp->cq_id)) {
2250 if (bp->b_cont) {
2251 freemsg(bp->b_cont);
2252 bp->b_cont = NULL;
2253 }
2254 bp->b_datap->db_type = M_IOCDATA;
2255 bp->b_wptr = bp->b_rptr + sizeof (struct copyresp);
2256 resp = (struct copyresp *)bp->b_rptr;
2257 resp->cp_rval = (caddr_t)1; /* failure */
2258 mutex_exit(&stp->sd_lock);
2259 putnext(stp->sd_wrq, bp);
2260 return (0);
2261 }
2262
2263 /*
2264 * Assign copy request to user and wake up.
2265 */
2266 stp->sd_iocblk = bp;
2267 cv_broadcast(&stp->sd_monitor);
2268 mutex_exit(&stp->sd_lock);
2269 return (0);
2270
2271 case M_SETOPTS:
2272 /*
2273 * Set stream head options (read option, write offset,
2274 * min/max packet size, and/or high/low water marks for
2275 * the read side only).
2276 */
2277
2278 bpri = 0;
2279 sop = (struct stroptions *)bp->b_rptr;
2280 mutex_enter(&stp->sd_lock);
2281 if (sop->so_flags & SO_READOPT) {
2282 switch (sop->so_readopt & RMODEMASK) {
2283 case RNORM:
2284 stp->sd_read_opt &= ~(RD_MSGDIS | RD_MSGNODIS);
2285 break;
2286
2287 case RMSGD:
2288 stp->sd_read_opt =
2289 ((stp->sd_read_opt & ~RD_MSGNODIS) |
2290 RD_MSGDIS);
2291 break;
2292
2293 case RMSGN:
2294 stp->sd_read_opt =
2295 ((stp->sd_read_opt & ~RD_MSGDIS) |
2296 RD_MSGNODIS);
2297 break;
2298 }
2299 switch (sop->so_readopt & RPROTMASK) {
2300 case RPROTNORM:
2301 stp->sd_read_opt &= ~(RD_PROTDAT | RD_PROTDIS);
2302 break;
2303
2304 case RPROTDAT:
2305 stp->sd_read_opt =
2306 ((stp->sd_read_opt & ~RD_PROTDIS) |
2307 RD_PROTDAT);
2308 break;
2309
2310 case RPROTDIS:
2311 stp->sd_read_opt =
2312 ((stp->sd_read_opt & ~RD_PROTDAT) |
2313 RD_PROTDIS);
2314 break;
2315 }
2316 switch (sop->so_readopt & RFLUSHMASK) {
2317 case RFLUSHPCPROT:
2318 /*
2319 * This sets the stream head to NOT flush
2320 * M_PCPROTO messages.
2321 */
2322 stp->sd_read_opt |= RFLUSHPCPROT;
2323 break;
2324 }
2325 }
2326 if (sop->so_flags & SO_ERROPT) {
2327 switch (sop->so_erropt & RERRMASK) {
2328 case RERRNORM:
2329 stp->sd_flag &= ~STRDERRNONPERSIST;
2330 break;
2331 case RERRNONPERSIST:
2332 stp->sd_flag |= STRDERRNONPERSIST;
2333 break;
2334 }
2335 switch (sop->so_erropt & WERRMASK) {
2336 case WERRNORM:
2337 stp->sd_flag &= ~STWRERRNONPERSIST;
2338 break;
2339 case WERRNONPERSIST:
2340 stp->sd_flag |= STWRERRNONPERSIST;
2341 break;
2342 }
2343 }
2344 if (sop->so_flags & SO_COPYOPT) {
2345 if (sop->so_copyopt & ZCVMSAFE) {
2346 stp->sd_copyflag |= STZCVMSAFE;
2347 stp->sd_copyflag &= ~STZCVMUNSAFE;
2348 } else if (sop->so_copyopt & ZCVMUNSAFE) {
2349 stp->sd_copyflag |= STZCVMUNSAFE;
2350 stp->sd_copyflag &= ~STZCVMSAFE;
2351 }
2352
2353 if (sop->so_copyopt & COPYCACHED) {
2354 stp->sd_copyflag |= STRCOPYCACHED;
2355 }
2356 }
2357 if (sop->so_flags & SO_WROFF)
2358 stp->sd_wroff = sop->so_wroff;
2359 if (sop->so_flags & SO_TAIL)
2360 stp->sd_tail = sop->so_tail;
2361 if (sop->so_flags & SO_MINPSZ)
2362 q->q_minpsz = sop->so_minpsz;
2363 if (sop->so_flags & SO_MAXPSZ)
2364 q->q_maxpsz = sop->so_maxpsz;
2365 if (sop->so_flags & SO_MAXBLK)
2366 stp->sd_maxblk = sop->so_maxblk;
2367 if (sop->so_flags & SO_HIWAT) {
2368 if (sop->so_flags & SO_BAND) {
2369 if (strqset(q, QHIWAT,
2370 sop->so_band, sop->so_hiwat)) {
2371 cmn_err(CE_WARN, "strrput: could not "
2372 "allocate qband\n");
2373 } else {
2374 bpri = sop->so_band;
2375 }
2376 } else {
2377 q->q_hiwat = sop->so_hiwat;
2378 }
2379 }
2380 if (sop->so_flags & SO_LOWAT) {
2381 if (sop->so_flags & SO_BAND) {
2382 if (strqset(q, QLOWAT,
2383 sop->so_band, sop->so_lowat)) {
2384 cmn_err(CE_WARN, "strrput: could not "
2385 "allocate qband\n");
2386 } else {
2387 bpri = sop->so_band;
2388 }
2389 } else {
2390 q->q_lowat = sop->so_lowat;
2391 }
2392 }
2393 if (sop->so_flags & SO_MREADON)
2394 stp->sd_flag |= SNDMREAD;
2395 if (sop->so_flags & SO_MREADOFF)
2396 stp->sd_flag &= ~SNDMREAD;
2397 if (sop->so_flags & SO_NDELON)
2398 stp->sd_flag |= OLDNDELAY;
2399 if (sop->so_flags & SO_NDELOFF)
2400 stp->sd_flag &= ~OLDNDELAY;
2401 if (sop->so_flags & SO_ISTTY)
2402 stp->sd_flag |= STRISTTY;
2403 if (sop->so_flags & SO_ISNTTY)
2404 stp->sd_flag &= ~STRISTTY;
2405 if (sop->so_flags & SO_TOSTOP)
2406 stp->sd_flag |= STRTOSTOP;
2407 if (sop->so_flags & SO_TONSTOP)
2408 stp->sd_flag &= ~STRTOSTOP;
2409 if (sop->so_flags & SO_DELIM)
2410 stp->sd_flag |= STRDELIM;
2411 if (sop->so_flags & SO_NODELIM)
2412 stp->sd_flag &= ~STRDELIM;
2413
2414 mutex_exit(&stp->sd_lock);
2415 freemsg(bp);
2416
2417 /* Check backenable in case the water marks changed */
2418 qbackenable(q, bpri);
2419 return (0);
2420
2421 /*
2422 * The following set of cases deal with situations where two stream
2423 * heads are connected to each other (twisted streams). These messages
2424 * have no meaning at the stream head.
2425 */
2426 case M_BREAK:
2427 case M_CTL:
2428 case M_DELAY:
2429 case M_START:
2430 case M_STOP:
2431 case M_IOCDATA:
2432 case M_STARTI:
2433 case M_STOPI:
2434 freemsg(bp);
2435 return (0);
2436
2437 case M_IOCTL:
2438 /*
2439 * Always NAK this condition
2440 * (makes no sense)
2441 * If there is one or more threads in the read side
2442 * rwnext we have to defer the nacking until that thread
2443 * returns (in strget).
2444 */
2445 mutex_enter(&stp->sd_lock);
2446 if (stp->sd_struiodnak != 0) {
2447 /*
2448 * Defer NAK to the streamhead. Queue at the end
2449 * the list.
2450 */
2451 mblk_t *mp = stp->sd_struionak;
2452
2453 while (mp && mp->b_next)
2454 mp = mp->b_next;
2455 if (mp)
2456 mp->b_next = bp;
2457 else
2458 stp->sd_struionak = bp;
2459 bp->b_next = NULL;
2460 mutex_exit(&stp->sd_lock);
2461 return (0);
2462 }
2463 mutex_exit(&stp->sd_lock);
2464
2465 bp->b_datap->db_type = M_IOCNAK;
2466 /*
2467 * Protect against the driver passing up
2468 * messages after it has done a qprocsoff.
2469 */
2470 if (_OTHERQ(q)->q_next == NULL)
2471 freemsg(bp);
2472 else
2473 qreply(q, bp);
2474 return (0);
2475
2476 default:
2477 #ifdef DEBUG
2478 cmn_err(CE_WARN,
2479 "bad message type %x received at stream head\n",
2480 bp->b_datap->db_type);
2481 #endif
2482 freemsg(bp);
2483 return (0);
2484 }
2485
2486 /* NOTREACHED */
2487 }
2488
2489 /*
2490 * Check if the stream pointed to by `stp' can be written to, and return an
2491 * error code if not. If `eiohup' is set, then return EIO if STRHUP is set.
2492 * If `sigpipeok' is set and the SW_SIGPIPE option is enabled on the stream,
2493 * then always return EPIPE and send a SIGPIPE to the invoking thread.
2494 */
2495 static int
2496 strwriteable(struct stdata *stp, boolean_t eiohup, boolean_t sigpipeok)
2497 {
2498 int error;
2499
2500 ASSERT(MUTEX_HELD(&stp->sd_lock));
2501
2502 /*
2503 * For modem support, POSIX states that on writes, EIO should
2504 * be returned if the stream has been hung up.
2505 */
2506 if (eiohup && (stp->sd_flag & (STPLEX|STRHUP)) == STRHUP)
2507 error = EIO;
2508 else
2509 error = strgeterr(stp, STRHUP|STPLEX|STWRERR, 0);
2510
2511 if (error != 0) {
2512 if (!(stp->sd_flag & STPLEX) &&
2513 (stp->sd_wput_opt & SW_SIGPIPE) && sigpipeok) {
2514 tsignal(curthread, SIGPIPE);
2515 error = EPIPE;
2516 }
2517 }
2518
2519 return (error);
2520 }
2521
2522 /*
2523 * Copyin and send data down a stream.
2524 * The caller will allocate and copyin any control part that precedes the
2525 * message and pass that in as mctl.
2526 *
2527 * Caller should *not* hold sd_lock.
2528 * When EWOULDBLOCK is returned the caller has to redo the canputnext
2529 * under sd_lock in order to avoid missing a backenabling wakeup.
2530 *
2531 * Use iosize = -1 to not send any M_DATA. iosize = 0 sends zero-length M_DATA.
2532 *
2533 * Set MSG_IGNFLOW in flags to ignore flow control for hipri messages.
2534 * For sync streams we can only ignore flow control by reverting to using
2535 * putnext.
2536 *
2537 * If sd_maxblk is less than *iosize this routine might return without
2538 * transferring all of *iosize. In all cases, on return *iosize will contain
2539 * the amount of data that was transferred.
2540 */
2541 static int
2542 strput(struct stdata *stp, mblk_t *mctl, struct uio *uiop, ssize_t *iosize,
2543 int b_flag, int pri, int flags)
2544 {
2545 struiod_t uiod;
2546 mblk_t *mp;
2547 queue_t *wqp = stp->sd_wrq;
2548 int error = 0;
2549 ssize_t count = *iosize;
2550
2551 ASSERT(MUTEX_NOT_HELD(&stp->sd_lock));
2552
2553 if (uiop != NULL && count >= 0)
2554 flags |= stp->sd_struiowrq ? STRUIO_POSTPONE : 0;
2555
2556 if (!(flags & STRUIO_POSTPONE)) {
2557 /*
2558 * Use regular canputnext, strmakedata, putnext sequence.
2559 */
2560 if (pri == 0) {
2561 if (!canputnext(wqp) && !(flags & MSG_IGNFLOW)) {
2562 freemsg(mctl);
2563 return (EWOULDBLOCK);
2564 }
2565 } else {
2566 if (!(flags & MSG_IGNFLOW) && !bcanputnext(wqp, pri)) {
2567 freemsg(mctl);
2568 return (EWOULDBLOCK);
2569 }
2570 }
2571
2572 if ((error = strmakedata(iosize, uiop, stp, flags,
2573 &mp)) != 0) {
2574 freemsg(mctl);
2575 /*
2576 * need to change return code to ENOMEM
2577 * so that this is not confused with
2578 * flow control, EAGAIN.
2579 */
2580
2581 if (error == EAGAIN)
2582 return (ENOMEM);
2583 else
2584 return (error);
2585 }
2586 if (mctl != NULL) {
2587 if (mctl->b_cont == NULL)
2588 mctl->b_cont = mp;
2589 else if (mp != NULL)
2590 linkb(mctl, mp);
2591 mp = mctl;
2592 } else if (mp == NULL)
2593 return (0);
2594
2595 mp->b_flag |= b_flag;
2596 mp->b_band = (uchar_t)pri;
2597
2598 if (flags & MSG_IGNFLOW) {
2599 /*
2600 * XXX Hack: Don't get stuck running service
2601 * procedures. This is needed for sockfs when
2602 * sending the unbind message out of the rput
2603 * procedure - we don't want a put procedure
2604 * to run service procedures.
2605 */
2606 putnext(wqp, mp);
2607 } else {
2608 stream_willservice(stp);
2609 putnext(wqp, mp);
2610 stream_runservice(stp);
2611 }
2612 return (0);
2613 }
2614 /*
2615 * Stream supports rwnext() for the write side.
2616 */
2617 if ((error = strmakedata(iosize, uiop, stp, flags, &mp)) != 0) {
2618 freemsg(mctl);
2619 /*
2620 * map EAGAIN to ENOMEM since EAGAIN means "flow controlled".
2621 */
2622 return (error == EAGAIN ? ENOMEM : error);
2623 }
2624 if (mctl != NULL) {
2625 if (mctl->b_cont == NULL)
2626 mctl->b_cont = mp;
2627 else if (mp != NULL)
2628 linkb(mctl, mp);
2629 mp = mctl;
2630 } else if (mp == NULL) {
2631 return (0);
2632 }
2633
2634 mp->b_flag |= b_flag;
2635 mp->b_band = (uchar_t)pri;
2636
2637 (void) uiodup(uiop, &uiod.d_uio, uiod.d_iov,
2638 sizeof (uiod.d_iov) / sizeof (*uiod.d_iov));
2639 uiod.d_uio.uio_offset = 0;
2640 uiod.d_mp = mp;
2641 error = rwnext(wqp, &uiod);
2642 if (! uiod.d_mp) {
2643 uioskip(uiop, *iosize);
2644 return (error);
2645 }
2646 ASSERT(mp == uiod.d_mp);
2647 if (error == EINVAL) {
2648 /*
2649 * The stream plumbing must have changed while
2650 * we were away, so just turn off rwnext()s.
2651 */
2652 error = 0;
2653 } else if (error == EBUSY || error == EWOULDBLOCK) {
2654 /*
2655 * Couldn't enter a perimeter or took a page fault,
2656 * so fall-back to putnext().
2657 */
2658 error = 0;
2659 } else {
2660 freemsg(mp);
2661 return (error);
2662 }
2663 /* Have to check canput before consuming data from the uio */
2664 if (pri == 0) {
2665 if (!canputnext(wqp) && !(flags & MSG_IGNFLOW)) {
2666 freemsg(mp);
2667 return (EWOULDBLOCK);
2668 }
2669 } else {
2670 if (!bcanputnext(wqp, pri) && !(flags & MSG_IGNFLOW)) {
2671 freemsg(mp);
2672 return (EWOULDBLOCK);
2673 }
2674 }
2675 ASSERT(mp == uiod.d_mp);
2676 /* Copyin data from the uio */
2677 if ((error = struioget(wqp, mp, &uiod, 0)) != 0) {
2678 freemsg(mp);
2679 return (error);
2680 }
2681 uioskip(uiop, *iosize);
2682 if (flags & MSG_IGNFLOW) {
2683 /*
2684 * XXX Hack: Don't get stuck running service procedures.
2685 * This is needed for sockfs when sending the unbind message
2686 * out of the rput procedure - we don't want a put procedure
2687 * to run service procedures.
2688 */
2689 putnext(wqp, mp);
2690 } else {
2691 stream_willservice(stp);
2692 putnext(wqp, mp);
2693 stream_runservice(stp);
2694 }
2695 return (0);
2696 }
2697
2698 /*
2699 * Write attempts to break the write request into messages conforming
2700 * with the minimum and maximum packet sizes set downstream.
2701 *
2702 * Write will not block if downstream queue is full and
2703 * O_NDELAY is set, otherwise it will block waiting for the queue to get room.
2704 *
2705 * A write of zero bytes gets packaged into a zero length message and sent
2706 * downstream like any other message.
2707 *
2708 * If buffers of the requested sizes are not available, the write will
2709 * sleep until the buffers become available.
2710 *
2711 * Write (if specified) will supply a write offset in a message if it
2712 * makes sense. This can be specified by downstream modules as part of
2713 * a M_SETOPTS message. Write will not supply the write offset if it
2714 * cannot supply any data in a buffer. In other words, write will never
2715 * send down an empty packet due to a write offset.
2716 */
2717 /* ARGSUSED2 */
2718 int
2719 strwrite(struct vnode *vp, struct uio *uiop, cred_t *crp)
2720 {
2721 return (strwrite_common(vp, uiop, crp, 0));
2722 }
2723
2724 /* ARGSUSED2 */
2725 int
2726 strwrite_common(struct vnode *vp, struct uio *uiop, cred_t *crp, int wflag)
2727 {
2728 struct stdata *stp;
2729 struct queue *wqp;
2730 ssize_t rmin, rmax;
2731 ssize_t iosize;
2732 int waitflag;
2733 int tempmode;
2734 int error = 0;
2735 int b_flag;
2736
2737 ASSERT(vp->v_stream);
2738 stp = vp->v_stream;
2739
2740 mutex_enter(&stp->sd_lock);
2741
2742 if ((error = i_straccess(stp, JCWRITE)) != 0) {
2743 mutex_exit(&stp->sd_lock);
2744 return (error);
2745 }
2746
2747 if (stp->sd_flag & (STWRERR|STRHUP|STPLEX)) {
2748 error = strwriteable(stp, B_TRUE, B_TRUE);
2749 if (error != 0) {
2750 mutex_exit(&stp->sd_lock);
2751 return (error);
2752 }
2753 }
2754
2755 mutex_exit(&stp->sd_lock);
2756
2757 wqp = stp->sd_wrq;
2758
2759 /* get these values from them cached in the stream head */
2760 rmin = stp->sd_qn_minpsz;
2761 rmax = stp->sd_qn_maxpsz;
2762
2763 /*
2764 * Check the min/max packet size constraints. If min packet size
2765 * is non-zero, the write cannot be split into multiple messages
2766 * and still guarantee the size constraints.
2767 */
2768 TRACE_1(TR_FAC_STREAMS_FR, TR_STRWRITE_IN, "strwrite in:q %p", wqp);
2769
2770 ASSERT((rmax >= 0) || (rmax == INFPSZ));
2771 if (rmax == 0) {
2772 return (0);
2773 }
2774 if (rmin > 0) {
2775 if (uiop->uio_resid < rmin) {
2776 TRACE_3(TR_FAC_STREAMS_FR, TR_STRWRITE_OUT,
2777 "strwrite out:q %p out %d error %d",
2778 wqp, 0, ERANGE);
2779 return (ERANGE);
2780 }
2781 if ((rmax != INFPSZ) && (uiop->uio_resid > rmax)) {
2782 TRACE_3(TR_FAC_STREAMS_FR, TR_STRWRITE_OUT,
2783 "strwrite out:q %p out %d error %d",
2784 wqp, 1, ERANGE);
2785 return (ERANGE);
2786 }
2787 }
2788
2789 /*
2790 * Do until count satisfied or error.
2791 */
2792 waitflag = WRITEWAIT | wflag;
2793 if (stp->sd_flag & OLDNDELAY)
2794 tempmode = uiop->uio_fmode & ~FNDELAY;
2795 else
2796 tempmode = uiop->uio_fmode;
2797
2798 if (rmax == INFPSZ)
2799 rmax = uiop->uio_resid;
2800
2801 /*
2802 * Note that tempmode does not get used in strput/strmakedata
2803 * but only in strwaitq. The other routines use uio_fmode
2804 * unmodified.
2805 */
2806
2807 /* LINTED: constant in conditional context */
2808 while (1) { /* breaks when uio_resid reaches zero */
2809 /*
2810 * Determine the size of the next message to be
2811 * packaged. May have to break write into several
2812 * messages based on max packet size.
2813 */
2814 iosize = MIN(uiop->uio_resid, rmax);
2815
2816 /*
2817 * Put block downstream when flow control allows it.
2818 */
2819 if ((stp->sd_flag & STRDELIM) && (uiop->uio_resid == iosize))
2820 b_flag = MSGDELIM;
2821 else
2822 b_flag = 0;
2823
2824 for (;;) {
2825 int done = 0;
2826
2827 error = strput(stp, NULL, uiop, &iosize, b_flag, 0, 0);
2828 if (error == 0)
2829 break;
2830 if (error != EWOULDBLOCK)
2831 goto out;
2832
2833 mutex_enter(&stp->sd_lock);
2834 /*
2835 * Check for a missed wakeup.
2836 * Needed since strput did not hold sd_lock across
2837 * the canputnext.
2838 */
2839 if (canputnext(wqp)) {
2840 /* Try again */
2841 mutex_exit(&stp->sd_lock);
2842 continue;
2843 }
2844 TRACE_1(TR_FAC_STREAMS_FR, TR_STRWRITE_WAIT,
2845 "strwrite wait:q %p wait", wqp);
2846 if ((error = strwaitq(stp, waitflag, (ssize_t)0,
2847 tempmode, -1, &done)) != 0 || done) {
2848 mutex_exit(&stp->sd_lock);
2849 if ((vp->v_type == VFIFO) &&
2850 (uiop->uio_fmode & FNDELAY) &&
2851 (error == EAGAIN))
2852 error = 0;
2853 goto out;
2854 }
2855 TRACE_1(TR_FAC_STREAMS_FR, TR_STRWRITE_WAKE,
2856 "strwrite wake:q %p awakes", wqp);
2857 if ((error = i_straccess(stp, JCWRITE)) != 0) {
2858 mutex_exit(&stp->sd_lock);
2859 goto out;
2860 }
2861 mutex_exit(&stp->sd_lock);
2862 }
2863 waitflag |= NOINTR;
2864 TRACE_2(TR_FAC_STREAMS_FR, TR_STRWRITE_RESID,
2865 "strwrite resid:q %p uiop %p", wqp, uiop);
2866 if (uiop->uio_resid) {
2867 /* Recheck for errors - needed for sockets */
2868 if ((stp->sd_wput_opt & SW_RECHECK_ERR) &&
2869 (stp->sd_flag & (STWRERR|STRHUP|STPLEX))) {
2870 mutex_enter(&stp->sd_lock);
2871 error = strwriteable(stp, B_FALSE, B_TRUE);
2872 mutex_exit(&stp->sd_lock);
2873 if (error != 0)
2874 return (error);
2875 }
2876 continue;
2877 }
2878 break;
2879 }
2880 out:
2881 /*
2882 * For historical reasons, applications expect EAGAIN when a data
2883 * mblk_t cannot be allocated, so change ENOMEM back to EAGAIN.
2884 */
2885 if (error == ENOMEM)
2886 error = EAGAIN;
2887 TRACE_3(TR_FAC_STREAMS_FR, TR_STRWRITE_OUT,
2888 "strwrite out:q %p out %d error %d", wqp, 2, error);
2889 return (error);
2890 }
2891
2892 /*
2893 * Stream head write service routine.
2894 * Its job is to wake up any sleeping writers when a queue
2895 * downstream needs data (part of the flow control in putq and getq).
2896 * It also must wake anyone sleeping on a poll().
2897 * For stream head right below mux module, it must also invoke put procedure
2898 * of next downstream module.
2899 */
2900 int
2901 strwsrv(queue_t *q)
2902 {
2903 struct stdata *stp;
2904 queue_t *tq;
2905 qband_t *qbp;
2906 int i;
2907 qband_t *myqbp;
2908 int isevent;
2909 unsigned char qbf[NBAND]; /* band flushing backenable flags */
2910
2911 TRACE_1(TR_FAC_STREAMS_FR,
2912 TR_STRWSRV, "strwsrv:q %p", q);
2913 stp = (struct stdata *)q->q_ptr;
2914 ASSERT(qclaimed(q));
2915 mutex_enter(&stp->sd_lock);
2916 ASSERT(!(stp->sd_flag & STPLEX));
2917
2918 if (stp->sd_flag & WSLEEP) {
2919 stp->sd_flag &= ~WSLEEP;
2920 cv_broadcast(&q->q_wait);
2921 }
2922 mutex_exit(&stp->sd_lock);
2923
2924 /* The other end of a stream pipe went away. */
2925 if ((tq = q->q_next) == NULL) {
2926 return (0);
2927 }
2928
2929 /* Find the next module forward that has a service procedure */
2930 claimstr(q);
2931 tq = q->q_nfsrv;
2932 ASSERT(tq != NULL);
2933
2934 if ((q->q_flag & QBACK)) {
2935 if ((tq->q_flag & QFULL)) {
2936 mutex_enter(QLOCK(tq));
2937 if (!(tq->q_flag & QFULL)) {
2938 mutex_exit(QLOCK(tq));
2939 goto wakeup;
2940 }
2941 /*
2942 * The queue must have become full again. Set QWANTW
2943 * again so strwsrv will be back enabled when
2944 * the queue becomes non-full next time.
2945 */
2946 tq->q_flag |= QWANTW;
2947 mutex_exit(QLOCK(tq));
2948 } else {
2949 wakeup:
2950 pollwakeup(&stp->sd_pollist, POLLWRNORM);
2951 mutex_enter(&stp->sd_lock);
2952 if (stp->sd_sigflags & S_WRNORM)
2953 strsendsig(stp->sd_siglist, S_WRNORM, 0, 0);
2954 mutex_exit(&stp->sd_lock);
2955 }
2956 }
2957
2958 isevent = 0;
2959 i = 1;
2960 bzero((caddr_t)qbf, NBAND);
2961 mutex_enter(QLOCK(tq));
2962 if ((myqbp = q->q_bandp) != NULL)
2963 for (qbp = tq->q_bandp; qbp && myqbp; qbp = qbp->qb_next) {
2964 ASSERT(myqbp);
2965 if ((myqbp->qb_flag & QB_BACK)) {
2966 if (qbp->qb_flag & QB_FULL) {
2967 /*
2968 * The band must have become full again.
2969 * Set QB_WANTW again so strwsrv will
2970 * be back enabled when the band becomes
2971 * non-full next time.
2972 */
2973 qbp->qb_flag |= QB_WANTW;
2974 } else {
2975 isevent = 1;
2976 qbf[i] = 1;
2977 }
2978 }
2979 myqbp = myqbp->qb_next;
2980 i++;
2981 }
2982 mutex_exit(QLOCK(tq));
2983
2984 if (isevent) {
2985 for (i = tq->q_nband; i; i--) {
2986 if (qbf[i]) {
2987 pollwakeup(&stp->sd_pollist, POLLWRBAND);
2988 mutex_enter(&stp->sd_lock);
2989 if (stp->sd_sigflags & S_WRBAND)
2990 strsendsig(stp->sd_siglist, S_WRBAND,
2991 (uchar_t)i, 0);
2992 mutex_exit(&stp->sd_lock);
2993 }
2994 }
2995 }
2996
2997 releasestr(q);
2998 return (0);
2999 }
3000
3001 /*
3002 * Special case of strcopyin/strcopyout for copying
3003 * struct strioctl that can deal with both data
3004 * models.
3005 */
3006
3007 #ifdef _LP64
3008
3009 static int
3010 strcopyin_strioctl(void *from, void *to, int flag, int copyflag)
3011 {
3012 struct strioctl32 strioc32;
3013 struct strioctl *striocp;
3014
3015 if (copyflag & U_TO_K) {
3016 ASSERT((copyflag & K_TO_K) == 0);
3017
3018 if ((flag & FMODELS) == DATAMODEL_ILP32) {
3019 if (copyin(from, &strioc32, sizeof (strioc32)))
3020 return (EFAULT);
3021
3022 striocp = (struct strioctl *)to;
3023 striocp->ic_cmd = strioc32.ic_cmd;
3024 striocp->ic_timout = strioc32.ic_timout;
3025 striocp->ic_len = strioc32.ic_len;
3026 striocp->ic_dp = (char *)(uintptr_t)strioc32.ic_dp;
3027
3028 } else { /* NATIVE data model */
3029 if (copyin(from, to, sizeof (struct strioctl))) {
3030 return (EFAULT);
3031 } else {
3032 return (0);
3033 }
3034 }
3035 } else {
3036 ASSERT(copyflag & K_TO_K);
3037 bcopy(from, to, sizeof (struct strioctl));
3038 }
3039 return (0);
3040 }
3041
3042 static int
3043 strcopyout_strioctl(void *from, void *to, int flag, int copyflag)
3044 {
3045 struct strioctl32 strioc32;
3046 struct strioctl *striocp;
3047
3048 if (copyflag & U_TO_K) {
3049 ASSERT((copyflag & K_TO_K) == 0);
3050
3051 if ((flag & FMODELS) == DATAMODEL_ILP32) {
3052 striocp = (struct strioctl *)from;
3053 strioc32.ic_cmd = striocp->ic_cmd;
3054 strioc32.ic_timout = striocp->ic_timout;
3055 strioc32.ic_len = striocp->ic_len;
3056 strioc32.ic_dp = (caddr32_t)(uintptr_t)striocp->ic_dp;
3057 ASSERT((char *)(uintptr_t)strioc32.ic_dp ==
3058 striocp->ic_dp);
3059
3060 if (copyout(&strioc32, to, sizeof (strioc32)))
3061 return (EFAULT);
3062
3063 } else { /* NATIVE data model */
3064 if (copyout(from, to, sizeof (struct strioctl))) {
3065 return (EFAULT);
3066 } else {
3067 return (0);
3068 }
3069 }
3070 } else {
3071 ASSERT(copyflag & K_TO_K);
3072 bcopy(from, to, sizeof (struct strioctl));
3073 }
3074 return (0);
3075 }
3076
3077 #else /* ! _LP64 */
3078
3079 /* ARGSUSED2 */
3080 static int
3081 strcopyin_strioctl(void *from, void *to, int flag, int copyflag)
3082 {
3083 return (strcopyin(from, to, sizeof (struct strioctl), copyflag));
3084 }
3085
3086 /* ARGSUSED2 */
3087 static int
3088 strcopyout_strioctl(void *from, void *to, int flag, int copyflag)
3089 {
3090 return (strcopyout(from, to, sizeof (struct strioctl), copyflag));
3091 }
3092
3093 #endif /* _LP64 */
3094
3095 /*
3096 * Determine type of job control semantics expected by user. The
3097 * possibilities are:
3098 * JCREAD - Behaves like read() on fd; send SIGTTIN
3099 * JCWRITE - Behaves like write() on fd; send SIGTTOU if TOSTOP set
3100 * JCSETP - Sets a value in the stream; send SIGTTOU, ignore TOSTOP
3101 * JCGETP - Gets a value in the stream; no signals.
3102 * See straccess in strsubr.c for usage of these values.
3103 *
3104 * This routine also returns -1 for I_STR as a special case; the
3105 * caller must call again with the real ioctl number for
3106 * classification.
3107 */
3108 static int
3109 job_control_type(int cmd)
3110 {
3111 switch (cmd) {
3112 case I_STR:
3113 return (-1);
3114
3115 case I_RECVFD:
3116 case I_E_RECVFD:
3117 return (JCREAD);
3118
3119 case I_FDINSERT:
3120 case I_SENDFD:
3121 return (JCWRITE);
3122
3123 case TCSETA:
3124 case TCSETAW:
3125 case TCSETAF:
3126 case TCSBRK:
3127 case TCXONC:
3128 case TCFLSH:
3129 case TCDSET: /* Obsolete */
3130 case TIOCSWINSZ:
3131 case TCSETS:
3132 case TCSETSW:
3133 case TCSETSF:
3134 case TIOCSETD:
3135 case TIOCHPCL:
3136 case TIOCSETP:
3137 case TIOCSETN:
3138 case TIOCEXCL:
3139 case TIOCNXCL:
3140 case TIOCFLUSH:
3141 case TIOCSETC:
3142 case TIOCLBIS:
3143 case TIOCLBIC:
3144 case TIOCLSET:
3145 case TIOCSBRK:
3146 case TIOCCBRK:
3147 case TIOCSDTR:
3148 case TIOCCDTR:
3149 case TIOCSLTC:
3150 case TIOCSTOP:
3151 case TIOCSTART:
3152 case TIOCSTI:
3153 case TIOCSPGRP:
3154 case TIOCMSET:
3155 case TIOCMBIS:
3156 case TIOCMBIC:
3157 case TIOCREMOTE:
3158 case TIOCSIGNAL:
3159 case LDSETT:
3160 case LDSMAP: /* Obsolete */
3161 case DIOCSETP:
3162 case I_FLUSH:
3163 case I_SRDOPT:
3164 case I_SETSIG:
3165 case I_SWROPT:
3166 case I_FLUSHBAND:
3167 case I_SETCLTIME:
3168 case I_SERROPT:
3169 case I_ESETSIG:
3170 case FIONBIO:
3171 case FIOASYNC:
3172 case FIOSETOWN:
3173 case JBOOT: /* Obsolete */
3174 case JTERM: /* Obsolete */
3175 case JTIMOM: /* Obsolete */
3176 case JZOMBOOT: /* Obsolete */
3177 case JAGENT: /* Obsolete */
3178 case JTRUN: /* Obsolete */
3179 case JXTPROTO: /* Obsolete */
3180 case TIOCSETLD:
3181 return (JCSETP);
3182 }
3183
3184 return (JCGETP);
3185 }
3186
3187 /*
3188 * ioctl for streams
3189 */
3190 int
3191 strioctl(struct vnode *vp, int cmd, intptr_t arg, int flag, int copyflag,
3192 cred_t *crp, int *rvalp)
3193 {
3194 struct stdata *stp;
3195 struct strcmd *scp;
3196 struct strioctl strioc;
3197 struct uio uio;
3198 struct iovec iov;
3199 int access;
3200 mblk_t *mp;
3201 int error = 0;
3202 int done = 0;
3203 ssize_t rmin, rmax;
3204 queue_t *wrq;
3205 queue_t *rdq;
3206 boolean_t kioctl = B_FALSE;
3207 uint32_t auditing = AU_AUDITING();
3208
3209 if (flag & FKIOCTL) {
3210 copyflag = K_TO_K;
3211 kioctl = B_TRUE;
3212 }
3213 ASSERT(vp->v_stream);
3214 ASSERT(copyflag == U_TO_K || copyflag == K_TO_K);
3215 stp = vp->v_stream;
3216
3217 TRACE_3(TR_FAC_STREAMS_FR, TR_IOCTL_ENTER,
3218 "strioctl:stp %p cmd %X arg %lX", stp, cmd, arg);
3219
3220 /*
3221 * If the copy is kernel to kernel, make sure that the FNATIVE
3222 * flag is set. After this it would be a serious error to have
3223 * no model flag.
3224 */
3225 if (copyflag == K_TO_K)
3226 flag = (flag & ~FMODELS) | FNATIVE;
3227
3228 ASSERT((flag & FMODELS) != 0);
3229
3230 wrq = stp->sd_wrq;
3231 rdq = _RD(wrq);
3232
3233 access = job_control_type(cmd);
3234
3235 /* We should never see these here, should be handled by iwscn */
3236 if (cmd == SRIOCSREDIR || cmd == SRIOCISREDIR)
3237 return (EINVAL);
3238
3239 mutex_enter(&stp->sd_lock);
3240 if ((access != -1) && ((error = i_straccess(stp, access)) != 0)) {
3241 mutex_exit(&stp->sd_lock);
3242 return (error);
3243 }
3244 mutex_exit(&stp->sd_lock);
3245
3246 /*
3247 * Check for sgttyb-related ioctls first, and complain as
3248 * necessary.
3249 */
3250 switch (cmd) {
3251 case TIOCGETP:
3252 case TIOCSETP:
3253 case TIOCSETN:
3254 if (sgttyb_handling >= 2 && !sgttyb_complaint) {
3255 sgttyb_complaint = B_TRUE;
3256 cmn_err(CE_NOTE,
3257 "application used obsolete TIOC[GS]ET");
3258 }
3259 if (sgttyb_handling >= 3) {
3260 tsignal(curthread, SIGSYS);
3261 return (EIO);
3262 }
3263 break;
3264 }
3265
3266 mutex_enter(&stp->sd_lock);
3267
3268 switch (cmd) {
3269 case I_RECVFD:
3270 case I_E_RECVFD:
3271 case I_PEEK:
3272 case I_NREAD:
3273 case FIONREAD:
3274 case FIORDCHK:
3275 case I_ATMARK:
3276 case FIONBIO:
3277 case FIOASYNC:
3278 if (stp->sd_flag & (STRDERR|STPLEX)) {
3279 error = strgeterr(stp, STRDERR|STPLEX, 0);
3280 if (error != 0) {
3281 mutex_exit(&stp->sd_lock);
3282 return (error);
3283 }
3284 }
3285 break;
3286
3287 default:
3288 if (stp->sd_flag & (STRDERR|STWRERR|STPLEX)) {
3289 error = strgeterr(stp, STRDERR|STWRERR|STPLEX, 0);
3290 if (error != 0) {
3291 mutex_exit(&stp->sd_lock);
3292 return (error);
3293 }
3294 }
3295 }
3296
3297 mutex_exit(&stp->sd_lock);
3298
3299 switch (cmd) {
3300 default:
3301 /*
3302 * The stream head has hardcoded knowledge of a
3303 * miscellaneous collection of terminal-, keyboard- and
3304 * mouse-related ioctls, enumerated below. This hardcoded
3305 * knowledge allows the stream head to automatically
3306 * convert transparent ioctl requests made by userland
3307 * programs into I_STR ioctls which many old STREAMS
3308 * modules and drivers require.
3309 *
3310 * No new ioctls should ever be added to this list.
3311 * Instead, the STREAMS module or driver should be written
3312 * to either handle transparent ioctls or require any
3313 * userland programs to use I_STR ioctls (by returning
3314 * EINVAL to any transparent ioctl requests).
3315 *
3316 * More importantly, removing ioctls from this list should
3317 * be done with the utmost care, since our STREAMS modules
3318 * and drivers *count* on the stream head performing this
3319 * conversion, and thus may panic while processing
3320 * transparent ioctl request for one of these ioctls (keep
3321 * in mind that third party modules and drivers may have
3322 * similar problems).
3323 */
3324 if (((cmd & IOCTYPE) == LDIOC) ||
3325 ((cmd & IOCTYPE) == tIOC) ||
3326 ((cmd & IOCTYPE) == TIOC) ||
3327 ((cmd & IOCTYPE) == KIOC) ||
3328 ((cmd & IOCTYPE) == MSIOC) ||
3329 ((cmd & IOCTYPE) == VUIOC)) {
3330 /*
3331 * The ioctl is a tty ioctl - set up strioc buffer
3332 * and call strdoioctl() to do the work.
3333 */
3334 if (stp->sd_flag & STRHUP)
3335 return (ENXIO);
3336 strioc.ic_cmd = cmd;
3337 strioc.ic_timout = INFTIM;
3338
3339 switch (cmd) {
3340
3341 case TCXONC:
3342 case TCSBRK:
3343 case TCFLSH:
3344 case TCDSET:
3345 {
3346 int native_arg = (int)arg;
3347 strioc.ic_len = sizeof (int);
3348 strioc.ic_dp = (char *)&native_arg;
3349 return (strdoioctl(stp, &strioc, flag,
3350 K_TO_K, crp, rvalp));
3351 }
3352
3353 case TCSETA:
3354 case TCSETAW:
3355 case TCSETAF:
3356 strioc.ic_len = sizeof (struct termio);
3357 strioc.ic_dp = (char *)arg;
3358 return (strdoioctl(stp, &strioc, flag,
3359 copyflag, crp, rvalp));
3360
3361 case TCSETS:
3362 case TCSETSW:
3363 case TCSETSF:
3364 strioc.ic_len = sizeof (struct termios);
3365 strioc.ic_dp = (char *)arg;
3366 return (strdoioctl(stp, &strioc, flag,
3367 copyflag, crp, rvalp));
3368
3369 case LDSETT:
3370 strioc.ic_len = sizeof (struct termcb);
3371 strioc.ic_dp = (char *)arg;
3372 return (strdoioctl(stp, &strioc, flag,
3373 copyflag, crp, rvalp));
3374
3375 case TIOCSETP:
3376 strioc.ic_len = sizeof (struct sgttyb);
3377 strioc.ic_dp = (char *)arg;
3378 return (strdoioctl(stp, &strioc, flag,
3379 copyflag, crp, rvalp));
3380
3381 case TIOCSTI:
3382 if ((flag & FREAD) == 0 &&
3383 secpolicy_sti(crp) != 0) {
3384 return (EPERM);
3385 }
3386 mutex_enter(&stp->sd_lock);
3387 mutex_enter(&curproc->p_splock);
3388 if (stp->sd_sidp != curproc->p_sessp->s_sidp &&
3389 secpolicy_sti(crp) != 0) {
3390 mutex_exit(&curproc->p_splock);
3391 mutex_exit(&stp->sd_lock);
3392 return (EACCES);
3393 }
3394 mutex_exit(&curproc->p_splock);
3395 mutex_exit(&stp->sd_lock);
3396
3397 strioc.ic_len = sizeof (char);
3398 strioc.ic_dp = (char *)arg;
3399 return (strdoioctl(stp, &strioc, flag,
3400 copyflag, crp, rvalp));
3401
3402 case TIOCSWINSZ:
3403 strioc.ic_len = sizeof (struct winsize);
3404 strioc.ic_dp = (char *)arg;
3405 return (strdoioctl(stp, &strioc, flag,
3406 copyflag, crp, rvalp));
3407
3408 case TIOCSSIZE:
3409 strioc.ic_len = sizeof (struct ttysize);
3410 strioc.ic_dp = (char *)arg;
3411 return (strdoioctl(stp, &strioc, flag,
3412 copyflag, crp, rvalp));
3413
3414 case TIOCSSOFTCAR:
3415 case KIOCTRANS:
3416 case KIOCTRANSABLE:
3417 case KIOCCMD:
3418 case KIOCSDIRECT:
3419 case KIOCSCOMPAT:
3420 case KIOCSKABORTEN:
3421 case KIOCSRPTDELAY:
3422 case KIOCSRPTRATE:
3423 case VUIDSFORMAT:
3424 case TIOCSPPS:
3425 strioc.ic_len = sizeof (int);
3426 strioc.ic_dp = (char *)arg;
3427 return (strdoioctl(stp, &strioc, flag,
3428 copyflag, crp, rvalp));
3429
3430 case KIOCSETKEY:
3431 case KIOCGETKEY:
3432 strioc.ic_len = sizeof (struct kiockey);
3433 strioc.ic_dp = (char *)arg;
3434 return (strdoioctl(stp, &strioc, flag,
3435 copyflag, crp, rvalp));
3436
3437 case KIOCSKEY:
3438 case KIOCGKEY:
3439 strioc.ic_len = sizeof (struct kiockeymap);
3440 strioc.ic_dp = (char *)arg;
3441 return (strdoioctl(stp, &strioc, flag,
3442 copyflag, crp, rvalp));
3443
3444 case KIOCSLED:
3445 /* arg is a pointer to char */
3446 strioc.ic_len = sizeof (char);
3447 strioc.ic_dp = (char *)arg;
3448 return (strdoioctl(stp, &strioc, flag,
3449 copyflag, crp, rvalp));
3450
3451 case MSIOSETPARMS:
3452 strioc.ic_len = sizeof (Ms_parms);
3453 strioc.ic_dp = (char *)arg;
3454 return (strdoioctl(stp, &strioc, flag,
3455 copyflag, crp, rvalp));
3456
3457 case VUIDSADDR:
3458 case VUIDGADDR:
3459 strioc.ic_len = sizeof (struct vuid_addr_probe);
3460 strioc.ic_dp = (char *)arg;
3461 return (strdoioctl(stp, &strioc, flag,
3462 copyflag, crp, rvalp));
3463
3464 /*
3465 * These M_IOCTL's don't require any data to be sent
3466 * downstream, and the driver will allocate and link
3467 * on its own mblk_t upon M_IOCACK -- thus we set
3468 * ic_len to zero and set ic_dp to arg so we know
3469 * where to copyout to later.
3470 */
3471 case TIOCGSOFTCAR:
3472 case TIOCGWINSZ:
3473 case TIOCGSIZE:
3474 case KIOCGTRANS:
3475 case KIOCGTRANSABLE:
3476 case KIOCTYPE:
3477 case KIOCGDIRECT:
3478 case KIOCGCOMPAT:
3479 case KIOCLAYOUT:
3480 case KIOCGLED:
3481 case MSIOGETPARMS:
3482 case MSIOBUTTONS:
3483 case VUIDGFORMAT:
3484 case TIOCGPPS:
3485 case TIOCGPPSEV:
3486 case TCGETA:
3487 case TCGETS:
3488 case LDGETT:
3489 case TIOCGETP:
3490 case KIOCGRPTDELAY:
3491 case KIOCGRPTRATE:
3492 strioc.ic_len = 0;
3493 strioc.ic_dp = (char *)arg;
3494 return (strdoioctl(stp, &strioc, flag,
3495 copyflag, crp, rvalp));
3496 }
3497 }
3498
3499 /*
3500 * Unknown cmd - send it down as a transparent ioctl.
3501 */
3502 strioc.ic_cmd = cmd;
3503 strioc.ic_timout = INFTIM;
3504 strioc.ic_len = TRANSPARENT;
3505 strioc.ic_dp = (char *)&arg;
3506
3507 return (strdoioctl(stp, &strioc, flag, copyflag, crp, rvalp));
3508
3509 case I_STR:
3510 /*
3511 * Stream ioctl. Read in an strioctl buffer from the user
3512 * along with any data specified and send it downstream.
3513 * Strdoioctl will wait allow only one ioctl message at
3514 * a time, and waits for the acknowledgement.
3515 */
3516
3517 if (stp->sd_flag & STRHUP)
3518 return (ENXIO);
3519
3520 error = strcopyin_strioctl((void *)arg, &strioc, flag,
3521 copyflag);
3522 if (error != 0)
3523 return (error);
3524
3525 if ((strioc.ic_len < 0) || (strioc.ic_timout < -1))
3526 return (EINVAL);
3527
3528 access = job_control_type(strioc.ic_cmd);
3529 mutex_enter(&stp->sd_lock);
3530 if ((access != -1) &&
3531 ((error = i_straccess(stp, access)) != 0)) {
3532 mutex_exit(&stp->sd_lock);
3533 return (error);
3534 }
3535 mutex_exit(&stp->sd_lock);
3536
3537 /*
3538 * The I_STR facility provides a trap door for malicious
3539 * code to send down bogus streamio(7I) ioctl commands to
3540 * unsuspecting STREAMS modules and drivers which expect to
3541 * only get these messages from the stream head.
3542 * Explicitly prohibit any streamio ioctls which can be
3543 * passed downstream by the stream head. Note that we do
3544 * not block all streamio ioctls because the ioctl
3545 * numberspace is not well managed and thus it's possible
3546 * that a module or driver's ioctl numbers may accidentally
3547 * collide with them.
3548 */
3549 switch (strioc.ic_cmd) {
3550 case I_LINK:
3551 case I_PLINK:
3552 case I_UNLINK:
3553 case I_PUNLINK:
3554 case _I_GETPEERCRED:
3555 case _I_PLINK_LH:
3556 return (EINVAL);
3557 }
3558
3559 error = strdoioctl(stp, &strioc, flag, copyflag, crp, rvalp);
3560 if (error == 0) {
3561 error = strcopyout_strioctl(&strioc, (void *)arg,
3562 flag, copyflag);
3563 }
3564 return (error);
3565
3566 case _I_CMD:
3567 /*
3568 * Like I_STR, but without using M_IOC* messages and without
3569 * copyins/copyouts beyond the passed-in argument.
3570 */
3571 if (stp->sd_flag & STRHUP)
3572 return (ENXIO);
3573
3574 if ((scp = kmem_alloc(sizeof (strcmd_t), KM_NOSLEEP)) == NULL)
3575 return (ENOMEM);
3576
3577 if (copyin((void *)arg, scp, sizeof (strcmd_t))) {
3578 kmem_free(scp, sizeof (strcmd_t));
3579 return (EFAULT);
3580 }
3581
3582 access = job_control_type(scp->sc_cmd);
3583 mutex_enter(&stp->sd_lock);
3584 if (access != -1 && (error = i_straccess(stp, access)) != 0) {
3585 mutex_exit(&stp->sd_lock);
3586 kmem_free(scp, sizeof (strcmd_t));
3587 return (error);
3588 }
3589 mutex_exit(&stp->sd_lock);
3590
3591 *rvalp = 0;
3592 if ((error = strdocmd(stp, scp, crp)) == 0) {
3593 if (copyout(scp, (void *)arg, sizeof (strcmd_t)))
3594 error = EFAULT;
3595 }
3596 kmem_free(scp, sizeof (strcmd_t));
3597 return (error);
3598
3599 case I_NREAD:
3600 /*
3601 * Return number of bytes of data in first message
3602 * in queue in "arg" and return the number of messages
3603 * in queue in return value.
3604 */
3605 {
3606 size_t size;
3607 int retval;
3608 int count = 0;
3609
3610 mutex_enter(QLOCK(rdq));
3611
3612 size = msgdsize(rdq->q_first);
3613 for (mp = rdq->q_first; mp != NULL; mp = mp->b_next)
3614 count++;
3615
3616 mutex_exit(QLOCK(rdq));
3617 if (stp->sd_struiordq) {
3618 infod_t infod;
3619
3620 infod.d_cmd = INFOD_COUNT;
3621 infod.d_count = 0;
3622 if (count == 0) {
3623 infod.d_cmd |= INFOD_FIRSTBYTES;
3624 infod.d_bytes = 0;
3625 }
3626 infod.d_res = 0;
3627 (void) infonext(rdq, &infod);
3628 count += infod.d_count;
3629 if (infod.d_res & INFOD_FIRSTBYTES)
3630 size = infod.d_bytes;
3631 }
3632
3633 /*
3634 * Drop down from size_t to the "int" required by the
3635 * interface. Cap at INT_MAX.
3636 */
3637 retval = MIN(size, INT_MAX);
3638 error = strcopyout(&retval, (void *)arg, sizeof (retval),
3639 copyflag);
3640 if (!error)
3641 *rvalp = count;
3642 return (error);
3643 }
3644
3645 case FIONREAD:
3646 /*
3647 * Return number of bytes of data in all data messages
3648 * in queue in "arg".
3649 */
3650 {
3651 size_t size = 0;
3652 int retval;
3653
3654 mutex_enter(QLOCK(rdq));
3655 for (mp = rdq->q_first; mp != NULL; mp = mp->b_next)
3656 size += msgdsize(mp);
3657 mutex_exit(QLOCK(rdq));
3658
3659 if (stp->sd_struiordq) {
3660 infod_t infod;
3661
3662 infod.d_cmd = INFOD_BYTES;
3663 infod.d_res = 0;
3664 infod.d_bytes = 0;
3665 (void) infonext(rdq, &infod);
3666 size += infod.d_bytes;
3667 }
3668
3669 /*
3670 * Drop down from size_t to the "int" required by the
3671 * interface. Cap at INT_MAX.
3672 */
3673 retval = MIN(size, INT_MAX);
3674 error = strcopyout(&retval, (void *)arg, sizeof (retval),
3675 copyflag);
3676
3677 *rvalp = 0;
3678 return (error);
3679 }
3680 case FIORDCHK:
3681 /*
3682 * FIORDCHK does not use arg value (like FIONREAD),
3683 * instead a count is returned. I_NREAD value may
3684 * not be accurate but safe. The real thing to do is
3685 * to add the msgdsizes of all data messages until
3686 * a non-data message.
3687 */
3688 {
3689 size_t size = 0;
3690
3691 mutex_enter(QLOCK(rdq));
3692 for (mp = rdq->q_first; mp != NULL; mp = mp->b_next)
3693 size += msgdsize(mp);
3694 mutex_exit(QLOCK(rdq));
3695
3696 if (stp->sd_struiordq) {
3697 infod_t infod;
3698
3699 infod.d_cmd = INFOD_BYTES;
3700 infod.d_res = 0;
3701 infod.d_bytes = 0;
3702 (void) infonext(rdq, &infod);
3703 size += infod.d_bytes;
3704 }
3705
3706 /*
3707 * Since ioctl returns an int, and memory sizes under
3708 * LP64 may not fit, we return INT_MAX if the count was
3709 * actually greater.
3710 */
3711 *rvalp = MIN(size, INT_MAX);
3712 return (0);
3713 }
3714
3715 case I_FIND:
3716 /*
3717 * Get module name.
3718 */
3719 {
3720 char mname[FMNAMESZ + 1];
3721 queue_t *q;
3722
3723 error = (copyflag & U_TO_K ? copyinstr : copystr)((void *)arg,
3724 mname, FMNAMESZ + 1, NULL);
3725 if (error)
3726 return ((error == ENAMETOOLONG) ? EINVAL : EFAULT);
3727
3728 /*
3729 * Return EINVAL if we're handed a bogus module name.
3730 */
3731 if (fmodsw_find(mname, FMODSW_LOAD) == NULL) {
3732 TRACE_0(TR_FAC_STREAMS_FR,
3733 TR_I_CANT_FIND, "couldn't I_FIND");
3734 return (EINVAL);
3735 }
3736
3737 *rvalp = 0;
3738
3739 /* Look downstream to see if module is there. */
3740 claimstr(stp->sd_wrq);
3741 for (q = stp->sd_wrq->q_next; q; q = q->q_next) {
3742 if (q->q_flag & QREADR) {
3743 q = NULL;
3744 break;
3745 }
3746 if (strcmp(mname, Q2NAME(q)) == 0)
3747 break;
3748 }
3749 releasestr(stp->sd_wrq);
3750
3751 *rvalp = (q ? 1 : 0);
3752 return (error);
3753 }
3754
3755 case I_PUSH:
3756 case __I_PUSH_NOCTTY:
3757 /*
3758 * Push a module.
3759 * For the case __I_PUSH_NOCTTY push a module but
3760 * do not allocate controlling tty. See bugid 4025044
3761 */
3762
3763 {
3764 char mname[FMNAMESZ + 1];
3765 fmodsw_impl_t *fp;
3766 dev_t dummydev;
3767
3768 if (stp->sd_flag & STRHUP)
3769 return (ENXIO);
3770
3771 /*
3772 * Get module name and look up in fmodsw.
3773 */
3774 error = (copyflag & U_TO_K ? copyinstr : copystr)((void *)arg,
3775 mname, FMNAMESZ + 1, NULL);
3776 if (error)
3777 return ((error == ENAMETOOLONG) ? EINVAL : EFAULT);
3778
3779 if ((fp = fmodsw_find(mname, FMODSW_HOLD | FMODSW_LOAD)) ==
3780 NULL)
3781 return (EINVAL);
3782
3783 TRACE_2(TR_FAC_STREAMS_FR, TR_I_PUSH,
3784 "I_PUSH:fp %p stp %p", fp, stp);
3785
3786 if (error = strstartplumb(stp, flag, cmd)) {
3787 fmodsw_rele(fp);
3788 return (error);
3789 }
3790
3791 /*
3792 * See if any more modules can be pushed on this stream.
3793 * Note that this check must be done after strstartplumb()
3794 * since otherwise multiple threads issuing I_PUSHes on
3795 * the same stream will be able to exceed nstrpush.
3796 */
3797 mutex_enter(&stp->sd_lock);
3798 if (stp->sd_pushcnt >= nstrpush) {
3799 fmodsw_rele(fp);
3800 strendplumb(stp);
3801 mutex_exit(&stp->sd_lock);
3802 return (EINVAL);
3803 }
3804 mutex_exit(&stp->sd_lock);
3805
3806 /*
3807 * Push new module and call its open routine
3808 * via qattach(). Modules don't change device
3809 * numbers, so just ignore dummydev here.
3810 */
3811 dummydev = vp->v_rdev;
3812 if ((error = qattach(rdq, &dummydev, 0, crp, fp,
3813 B_FALSE)) == 0) {
3814 if (vp->v_type == VCHR && /* sorry, no pipes allowed */
3815 (cmd == I_PUSH) && (stp->sd_flag & STRISTTY)) {
3816 /*
3817 * try to allocate it as a controlling terminal
3818 */
3819 (void) strctty(stp);
3820 }
3821 }
3822
3823 mutex_enter(&stp->sd_lock);
3824
3825 /*
3826 * As a performance concern we are caching the values of
3827 * q_minpsz and q_maxpsz of the module below the stream
3828 * head in the stream head.
3829 */
3830 mutex_enter(QLOCK(stp->sd_wrq->q_next));
3831 rmin = stp->sd_wrq->q_next->q_minpsz;
3832 rmax = stp->sd_wrq->q_next->q_maxpsz;
3833 mutex_exit(QLOCK(stp->sd_wrq->q_next));
3834
3835 /* Do this processing here as a performance concern */
3836 if (strmsgsz != 0) {
3837 if (rmax == INFPSZ)
3838 rmax = strmsgsz;
3839 else {
3840 if (vp->v_type == VFIFO)
3841 rmax = MIN(PIPE_BUF, rmax);
3842 else rmax = MIN(strmsgsz, rmax);
3843 }
3844 }
3845
3846 mutex_enter(QLOCK(wrq));
3847 stp->sd_qn_minpsz = rmin;
3848 stp->sd_qn_maxpsz = rmax;
3849 mutex_exit(QLOCK(wrq));
3850
3851 strendplumb(stp);
3852 mutex_exit(&stp->sd_lock);
3853 return (error);
3854 }
3855
3856 case I_POP:
3857 {
3858 queue_t *q;
3859
3860 if (stp->sd_flag & STRHUP)
3861 return (ENXIO);
3862 if (!wrq->q_next) /* for broken pipes */
3863 return (EINVAL);
3864
3865 if (error = strstartplumb(stp, flag, cmd))
3866 return (error);
3867
3868 /*
3869 * If there is an anchor on this stream and popping
3870 * the current module would attempt to pop through the
3871 * anchor, then disallow the pop unless we have sufficient
3872 * privileges; take the cheapest (non-locking) check
3873 * first.
3874 */
3875 if (secpolicy_ip_config(crp, B_TRUE) != 0 ||
3876 (stp->sd_anchorzone != crgetzoneid(crp))) {
3877 mutex_enter(&stp->sd_lock);
3878 /*
3879 * Anchors only apply if there's at least one
3880 * module on the stream (sd_pushcnt > 0).
3881 */
3882 if (stp->sd_pushcnt > 0 &&
3883 stp->sd_pushcnt == stp->sd_anchor &&
3884 stp->sd_vnode->v_type != VFIFO) {
3885 strendplumb(stp);
3886 mutex_exit(&stp->sd_lock);
3887 if (stp->sd_anchorzone != crgetzoneid(crp))
3888 return (EINVAL);
3889 /* Audit and report error */
3890 return (secpolicy_ip_config(crp, B_FALSE));
3891 }
3892 mutex_exit(&stp->sd_lock);
3893 }
3894
3895 q = wrq->q_next;
3896 TRACE_2(TR_FAC_STREAMS_FR, TR_I_POP,
3897 "I_POP:%p from %p", q, stp);
3898 if (q->q_next == NULL || (q->q_flag & (QREADR|QISDRV))) {
3899 error = EINVAL;
3900 } else {
3901 qdetach(_RD(q), 1, flag, crp, B_FALSE);
3902 error = 0;
3903 }
3904 mutex_enter(&stp->sd_lock);
3905
3906 /*
3907 * As a performance concern we are caching the values of
3908 * q_minpsz and q_maxpsz of the module below the stream
3909 * head in the stream head.
3910 */
3911 mutex_enter(QLOCK(wrq->q_next));
3912 rmin = wrq->q_next->q_minpsz;
3913 rmax = wrq->q_next->q_maxpsz;
3914 mutex_exit(QLOCK(wrq->q_next));
3915
3916 /* Do this processing here as a performance concern */
3917 if (strmsgsz != 0) {
3918 if (rmax == INFPSZ)
3919 rmax = strmsgsz;
3920 else {
3921 if (vp->v_type == VFIFO)
3922 rmax = MIN(PIPE_BUF, rmax);
3923 else rmax = MIN(strmsgsz, rmax);
3924 }
3925 }
3926
3927 mutex_enter(QLOCK(wrq));
3928 stp->sd_qn_minpsz = rmin;
3929 stp->sd_qn_maxpsz = rmax;
3930 mutex_exit(QLOCK(wrq));
3931
3932 /* If we popped through the anchor, then reset the anchor. */
3933 if (stp->sd_pushcnt < stp->sd_anchor) {
3934 stp->sd_anchor = 0;
3935 stp->sd_anchorzone = 0;
3936 }
3937 strendplumb(stp);
3938 mutex_exit(&stp->sd_lock);
3939 return (error);
3940 }
3941
3942 case _I_MUXID2FD:
3943 {
3944 /*
3945 * Create a fd for a I_PLINK'ed lower stream with a given
3946 * muxid. With the fd, application can send down ioctls,
3947 * like I_LIST, to the previously I_PLINK'ed stream. Note
3948 * that after getting the fd, the application has to do an
3949 * I_PUNLINK on the muxid before it can do any operation
3950 * on the lower stream. This is required by spec1170.
3951 *
3952 * The fd used to do this ioctl should point to the same
3953 * controlling device used to do the I_PLINK. If it uses
3954 * a different stream or an invalid muxid, I_MUXID2FD will
3955 * fail. The error code is set to EINVAL.
3956 *
3957 * The intended use of this interface is the following.
3958 * An application I_PLINK'ed a stream and exits. The fd
3959 * to the lower stream is gone. Another application
3960 * wants to get a fd to the lower stream, it uses I_MUXID2FD.
3961 */
3962 int muxid = (int)arg;
3963 int fd;
3964 linkinfo_t *linkp;
3965 struct file *fp;
3966 netstack_t *ns;
3967 str_stack_t *ss;
3968
3969 /*
3970 * Do not allow the wildcard muxid. This ioctl is not
3971 * intended to find arbitrary link.
3972 */
3973 if (muxid == 0) {
3974 return (EINVAL);
3975 }
3976
3977 ns = netstack_find_by_cred(crp);
3978 ASSERT(ns != NULL);
3979 ss = ns->netstack_str;
3980 ASSERT(ss != NULL);
3981
3982 mutex_enter(&muxifier);
3983 linkp = findlinks(vp->v_stream, muxid, LINKPERSIST, ss);
3984 if (linkp == NULL) {
3985 mutex_exit(&muxifier);
3986 netstack_rele(ss->ss_netstack);
3987 return (EINVAL);
3988 }
3989
3990 if ((fd = ufalloc(0)) == -1) {
3991 mutex_exit(&muxifier);
3992 netstack_rele(ss->ss_netstack);
3993 return (EMFILE);
3994 }
3995 fp = linkp->li_fpdown;
3996 mutex_enter(&fp->f_tlock);
3997 fp->f_count++;
3998 mutex_exit(&fp->f_tlock);
3999 mutex_exit(&muxifier);
4000 setf(fd, fp);
4001 *rvalp = fd;
4002 netstack_rele(ss->ss_netstack);
4003 return (0);
4004 }
4005
4006 case _I_INSERT:
4007 {
4008 /*
4009 * To insert a module to a given position in a stream.
4010 * In the first release, only allow privileged user
4011 * to use this ioctl. Furthermore, the insert is only allowed
4012 * below an anchor if the zoneid is the same as the zoneid
4013 * which created the anchor.
4014 *
4015 * Note that we do not plan to support this ioctl
4016 * on pipes in the first release. We want to learn more
4017 * about the implications of these ioctls before extending
4018 * their support. And we do not think these features are
4019 * valuable for pipes.
4020 */
4021 STRUCT_DECL(strmodconf, strmodinsert);
4022 char mod_name[FMNAMESZ + 1];
4023 fmodsw_impl_t *fp;
4024 dev_t dummydev;
4025 queue_t *tmp_wrq;
4026 int pos;
4027 boolean_t is_insert;
4028
4029 STRUCT_INIT(strmodinsert, flag);
4030 if (stp->sd_flag & STRHUP)
4031 return (ENXIO);
4032 if (STRMATED(stp))
4033 return (EINVAL);
4034 if ((error = secpolicy_net_config(crp, B_FALSE)) != 0)
4035 return (error);
4036 if (stp->sd_anchor != 0 &&
4037 stp->sd_anchorzone != crgetzoneid(crp))
4038 return (EINVAL);
4039
4040 error = strcopyin((void *)arg, STRUCT_BUF(strmodinsert),
4041 STRUCT_SIZE(strmodinsert), copyflag);
4042 if (error)
4043 return (error);
4044
4045 /*
4046 * Get module name and look up in fmodsw.
4047 */
4048 error = (copyflag & U_TO_K ? copyinstr :
4049 copystr)(STRUCT_FGETP(strmodinsert, mod_name),
4050 mod_name, FMNAMESZ + 1, NULL);
4051 if (error)
4052 return ((error == ENAMETOOLONG) ? EINVAL : EFAULT);
4053
4054 if ((fp = fmodsw_find(mod_name, FMODSW_HOLD | FMODSW_LOAD)) ==
4055 NULL)
4056 return (EINVAL);
4057
4058 if (error = strstartplumb(stp, flag, cmd)) {
4059 fmodsw_rele(fp);
4060 return (error);
4061 }
4062
4063 /*
4064 * Is this _I_INSERT just like an I_PUSH? We need to know
4065 * this because we do some optimizations if this is a
4066 * module being pushed.
4067 */
4068 pos = STRUCT_FGET(strmodinsert, pos);
4069 is_insert = (pos != 0);
4070
4071 /*
4072 * Make sure pos is valid. Even though it is not an I_PUSH,
4073 * we impose the same limit on the number of modules in a
4074 * stream.
4075 */
4076 mutex_enter(&stp->sd_lock);
4077 if (stp->sd_pushcnt >= nstrpush || pos < 0 ||
4078 pos > stp->sd_pushcnt) {
4079 fmodsw_rele(fp);
4080 strendplumb(stp);
4081 mutex_exit(&stp->sd_lock);
4082 return (EINVAL);
4083 }
4084 if (stp->sd_anchor != 0) {
4085 /*
4086 * Is this insert below the anchor?
4087 * Pushcnt hasn't been increased yet hence
4088 * we test for greater than here, and greater or
4089 * equal after qattach.
4090 */
4091 if (pos > (stp->sd_pushcnt - stp->sd_anchor) &&
4092 stp->sd_anchorzone != crgetzoneid(crp)) {
4093 fmodsw_rele(fp);
4094 strendplumb(stp);
4095 mutex_exit(&stp->sd_lock);
4096 return (EPERM);
4097 }
4098 }
4099
4100 mutex_exit(&stp->sd_lock);
4101
4102 /*
4103 * First find the correct position this module to
4104 * be inserted. We don't need to call claimstr()
4105 * as the stream should not be changing at this point.
4106 *
4107 * Insert new module and call its open routine
4108 * via qattach(). Modules don't change device
4109 * numbers, so just ignore dummydev here.
4110 */
4111 for (tmp_wrq = stp->sd_wrq; pos > 0;
4112 tmp_wrq = tmp_wrq->q_next, pos--) {
4113 ASSERT(SAMESTR(tmp_wrq));
4114 }
4115 dummydev = vp->v_rdev;
4116 if ((error = qattach(_RD(tmp_wrq), &dummydev, 0, crp,
4117 fp, is_insert)) != 0) {
4118 mutex_enter(&stp->sd_lock);
4119 strendplumb(stp);
4120 mutex_exit(&stp->sd_lock);
4121 return (error);
4122 }
4123
4124 mutex_enter(&stp->sd_lock);
4125
4126 /*
4127 * As a performance concern we are caching the values of
4128 * q_minpsz and q_maxpsz of the module below the stream
4129 * head in the stream head.
4130 */
4131 if (!is_insert) {
4132 mutex_enter(QLOCK(stp->sd_wrq->q_next));
4133 rmin = stp->sd_wrq->q_next->q_minpsz;
4134 rmax = stp->sd_wrq->q_next->q_maxpsz;
4135 mutex_exit(QLOCK(stp->sd_wrq->q_next));
4136
4137 /* Do this processing here as a performance concern */
4138 if (strmsgsz != 0) {
4139 if (rmax == INFPSZ) {
4140 rmax = strmsgsz;
4141 } else {
4142 rmax = MIN(strmsgsz, rmax);
4143 }
4144 }
4145
4146 mutex_enter(QLOCK(wrq));
4147 stp->sd_qn_minpsz = rmin;
4148 stp->sd_qn_maxpsz = rmax;
4149 mutex_exit(QLOCK(wrq));
4150 }
4151
4152 /*
4153 * Need to update the anchor value if this module is
4154 * inserted below the anchor point.
4155 */
4156 if (stp->sd_anchor != 0) {
4157 pos = STRUCT_FGET(strmodinsert, pos);
4158 if (pos >= (stp->sd_pushcnt - stp->sd_anchor))
4159 stp->sd_anchor++;
4160 }
4161
4162 strendplumb(stp);
4163 mutex_exit(&stp->sd_lock);
4164 return (0);
4165 }
4166
4167 case _I_REMOVE:
4168 {
4169 /*
4170 * To remove a module with a given name in a stream. The
4171 * caller of this ioctl needs to provide both the name and
4172 * the position of the module to be removed. This eliminates
4173 * the ambiguity of removal if a module is inserted/pushed
4174 * multiple times in a stream. In the first release, only
4175 * allow privileged user to use this ioctl.
4176 * Furthermore, the remove is only allowed
4177 * below an anchor if the zoneid is the same as the zoneid
4178 * which created the anchor.
4179 *
4180 * Note that we do not plan to support this ioctl
4181 * on pipes in the first release. We want to learn more
4182 * about the implications of these ioctls before extending
4183 * their support. And we do not think these features are
4184 * valuable for pipes.
4185 *
4186 * Also note that _I_REMOVE cannot be used to remove a
4187 * driver or the stream head.
4188 */
4189 STRUCT_DECL(strmodconf, strmodremove);
4190 queue_t *q;
4191 int pos;
4192 char mod_name[FMNAMESZ + 1];
4193 boolean_t is_remove;
4194
4195 STRUCT_INIT(strmodremove, flag);
4196 if (stp->sd_flag & STRHUP)
4197 return (ENXIO);
4198 if (STRMATED(stp))
4199 return (EINVAL);
4200 if ((error = secpolicy_net_config(crp, B_FALSE)) != 0)
4201 return (error);
4202 if (stp->sd_anchor != 0 &&
4203 stp->sd_anchorzone != crgetzoneid(crp))
4204 return (EINVAL);
4205
4206 error = strcopyin((void *)arg, STRUCT_BUF(strmodremove),
4207 STRUCT_SIZE(strmodremove), copyflag);
4208 if (error)
4209 return (error);
4210
4211 error = (copyflag & U_TO_K ? copyinstr :
4212 copystr)(STRUCT_FGETP(strmodremove, mod_name),
4213 mod_name, FMNAMESZ + 1, NULL);
4214 if (error)
4215 return ((error == ENAMETOOLONG) ? EINVAL : EFAULT);
4216
4217 if ((error = strstartplumb(stp, flag, cmd)) != 0)
4218 return (error);
4219
4220 /*
4221 * Match the name of given module to the name of module at
4222 * the given position.
4223 */
4224 pos = STRUCT_FGET(strmodremove, pos);
4225
4226 is_remove = (pos != 0);
4227 for (q = stp->sd_wrq->q_next; SAMESTR(q) && pos > 0;
4228 q = q->q_next, pos--)
4229 ;
4230 if (pos > 0 || !SAMESTR(q) ||
4231 strcmp(Q2NAME(q), mod_name) != 0) {
4232 mutex_enter(&stp->sd_lock);
4233 strendplumb(stp);
4234 mutex_exit(&stp->sd_lock);
4235 return (EINVAL);
4236 }
4237
4238 /*
4239 * If the position is at or below an anchor, then the zoneid
4240 * must match the zoneid that created the anchor.
4241 */
4242 if (stp->sd_anchor != 0) {
4243 pos = STRUCT_FGET(strmodremove, pos);
4244 if (pos >= (stp->sd_pushcnt - stp->sd_anchor) &&
4245 stp->sd_anchorzone != crgetzoneid(crp)) {
4246 mutex_enter(&stp->sd_lock);
4247 strendplumb(stp);
4248 mutex_exit(&stp->sd_lock);
4249 return (EPERM);
4250 }
4251 }
4252
4253
4254 ASSERT(!(q->q_flag & QREADR));
4255 qdetach(_RD(q), 1, flag, crp, is_remove);
4256
4257 mutex_enter(&stp->sd_lock);
4258
4259 /*
4260 * As a performance concern we are caching the values of
4261 * q_minpsz and q_maxpsz of the module below the stream
4262 * head in the stream head.
4263 */
4264 if (!is_remove) {
4265 mutex_enter(QLOCK(wrq->q_next));
4266 rmin = wrq->q_next->q_minpsz;
4267 rmax = wrq->q_next->q_maxpsz;
4268 mutex_exit(QLOCK(wrq->q_next));
4269
4270 /* Do this processing here as a performance concern */
4271 if (strmsgsz != 0) {
4272 if (rmax == INFPSZ)
4273 rmax = strmsgsz;
4274 else {
4275 if (vp->v_type == VFIFO)
4276 rmax = MIN(PIPE_BUF, rmax);
4277 else rmax = MIN(strmsgsz, rmax);
4278 }
4279 }
4280
4281 mutex_enter(QLOCK(wrq));
4282 stp->sd_qn_minpsz = rmin;
4283 stp->sd_qn_maxpsz = rmax;
4284 mutex_exit(QLOCK(wrq));
4285 }
4286
4287 /*
4288 * Need to update the anchor value if this module is removed
4289 * at or below the anchor point. If the removed module is at
4290 * the anchor point, remove the anchor for this stream if
4291 * there is no module above the anchor point. Otherwise, if
4292 * the removed module is below the anchor point, decrement the
4293 * anchor point by 1.
4294 */
4295 if (stp->sd_anchor != 0) {
4296 pos = STRUCT_FGET(strmodremove, pos);
4297 if (pos == stp->sd_pushcnt - stp->sd_anchor + 1)
4298 stp->sd_anchor = 0;
4299 else if (pos > (stp->sd_pushcnt - stp->sd_anchor + 1))
4300 stp->sd_anchor--;
4301 }
4302
4303 strendplumb(stp);
4304 mutex_exit(&stp->sd_lock);
4305 return (0);
4306 }
4307
4308 case I_ANCHOR:
4309 /*
4310 * Set the anchor position on the stream to reside at
4311 * the top module (in other words, the top module
4312 * cannot be popped). Anchors with a FIFO make no
4313 * obvious sense, so they're not allowed.
4314 */
4315 mutex_enter(&stp->sd_lock);
4316
4317 if (stp->sd_vnode->v_type == VFIFO) {
4318 mutex_exit(&stp->sd_lock);
4319 return (EINVAL);
4320 }
4321 /* Only allow the same zoneid to update the anchor */
4322 if (stp->sd_anchor != 0 &&
4323 stp->sd_anchorzone != crgetzoneid(crp)) {
4324 mutex_exit(&stp->sd_lock);
4325 return (EINVAL);
4326 }
4327 stp->sd_anchor = stp->sd_pushcnt;
4328 stp->sd_anchorzone = crgetzoneid(crp);
4329 mutex_exit(&stp->sd_lock);
4330 return (0);
4331
4332 case I_LOOK:
4333 /*
4334 * Get name of first module downstream.
4335 * If no module, return an error.
4336 */
4337 claimstr(wrq);
4338 if (_SAMESTR(wrq) && wrq->q_next->q_next != NULL) {
4339 char *name = Q2NAME(wrq->q_next);
4340
4341 error = strcopyout(name, (void *)arg, strlen(name) + 1,
4342 copyflag);
4343 releasestr(wrq);
4344 return (error);
4345 }
4346 releasestr(wrq);
4347 return (EINVAL);
4348
4349 case I_LINK:
4350 case I_PLINK:
4351 /*
4352 * Link a multiplexor.
4353 */
4354 return (mlink(vp, cmd, (int)arg, crp, rvalp, 0));
4355
4356 case _I_PLINK_LH:
4357 /*
4358 * Link a multiplexor: Call must originate from kernel.
4359 */
4360 if (kioctl)
4361 return (ldi_mlink_lh(vp, cmd, arg, crp, rvalp));
4362
4363 return (EINVAL);
4364 case I_UNLINK:
4365 case I_PUNLINK:
4366 /*
4367 * Unlink a multiplexor.
4368 * If arg is -1, unlink all links for which this is the
4369 * controlling stream. Otherwise, arg is an index number
4370 * for a link to be removed.
4371 */
4372 {
4373 struct linkinfo *linkp;
4374 int native_arg = (int)arg;
4375 int type;
4376 netstack_t *ns;
4377 str_stack_t *ss;
4378
4379 TRACE_1(TR_FAC_STREAMS_FR,
4380 TR_I_UNLINK, "I_UNLINK/I_PUNLINK:%p", stp);
4381 if (vp->v_type == VFIFO) {
4382 return (EINVAL);
4383 }
4384 if (cmd == I_UNLINK)
4385 type = LINKNORMAL;
4386 else /* I_PUNLINK */
4387 type = LINKPERSIST;
4388 if (native_arg == 0) {
4389 return (EINVAL);
4390 }
4391 ns = netstack_find_by_cred(crp);
4392 ASSERT(ns != NULL);
4393 ss = ns->netstack_str;
4394 ASSERT(ss != NULL);
4395
4396 if (native_arg == MUXID_ALL)
4397 error = munlinkall(stp, type, crp, rvalp, ss);
4398 else {
4399 mutex_enter(&muxifier);
4400 if (!(linkp = findlinks(stp, (int)arg, type, ss))) {
4401 /* invalid user supplied index number */
4402 mutex_exit(&muxifier);
4403 netstack_rele(ss->ss_netstack);
4404 return (EINVAL);
4405 }
4406 /* munlink drops the muxifier lock */
4407 error = munlink(stp, linkp, type, crp, rvalp, ss);
4408 }
4409 netstack_rele(ss->ss_netstack);
4410 return (error);
4411 }
4412
4413 case I_FLUSH:
4414 /*
4415 * send a flush message downstream
4416 * flush message can indicate
4417 * FLUSHR - flush read queue
4418 * FLUSHW - flush write queue
4419 * FLUSHRW - flush read/write queue
4420 */
4421 if (stp->sd_flag & STRHUP)
4422 return (ENXIO);
4423 if (arg & ~FLUSHRW)
4424 return (EINVAL);
4425
4426 for (;;) {
4427 if (putnextctl1(stp->sd_wrq, M_FLUSH, (int)arg)) {
4428 break;
4429 }
4430 if (error = strwaitbuf(1, BPRI_HI)) {
4431 return (error);
4432 }
4433 }
4434
4435 /*
4436 * Send down an unsupported ioctl and wait for the nack
4437 * in order to allow the M_FLUSH to propagate back
4438 * up to the stream head.
4439 * Replaces if (qready()) runqueues();
4440 */
4441 strioc.ic_cmd = -1; /* The unsupported ioctl */
4442 strioc.ic_timout = 0;
4443 strioc.ic_len = 0;
4444 strioc.ic_dp = NULL;
4445 (void) strdoioctl(stp, &strioc, flag, K_TO_K, crp, rvalp);
4446 *rvalp = 0;
4447 return (0);
4448
4449 case I_FLUSHBAND:
4450 {
4451 struct bandinfo binfo;
4452
4453 error = strcopyin((void *)arg, &binfo, sizeof (binfo),
4454 copyflag);
4455 if (error)
4456 return (error);
4457 if (stp->sd_flag & STRHUP)
4458 return (ENXIO);
4459 if (binfo.bi_flag & ~FLUSHRW)
4460 return (EINVAL);
4461 while (!(mp = allocb(2, BPRI_HI))) {
4462 if (error = strwaitbuf(2, BPRI_HI))
4463 return (error);
4464 }
4465 mp->b_datap->db_type = M_FLUSH;
4466 *mp->b_wptr++ = binfo.bi_flag | FLUSHBAND;
4467 *mp->b_wptr++ = binfo.bi_pri;
4468 putnext(stp->sd_wrq, mp);
4469 /*
4470 * Send down an unsupported ioctl and wait for the nack
4471 * in order to allow the M_FLUSH to propagate back
4472 * up to the stream head.
4473 * Replaces if (qready()) runqueues();
4474 */
4475 strioc.ic_cmd = -1; /* The unsupported ioctl */
4476 strioc.ic_timout = 0;
4477 strioc.ic_len = 0;
4478 strioc.ic_dp = NULL;
4479 (void) strdoioctl(stp, &strioc, flag, K_TO_K, crp, rvalp);
4480 *rvalp = 0;
4481 return (0);
4482 }
4483
4484 case I_SRDOPT:
4485 /*
4486 * Set read options
4487 *
4488 * RNORM - default stream mode
4489 * RMSGN - message no discard
4490 * RMSGD - message discard
4491 * RPROTNORM - fail read with EBADMSG for M_[PC]PROTOs
4492 * RPROTDAT - convert M_[PC]PROTOs to M_DATAs
4493 * RPROTDIS - discard M_[PC]PROTOs and retain M_DATAs
4494 */
4495 if (arg & ~(RMODEMASK | RPROTMASK))
4496 return (EINVAL);
4497
4498 if ((arg & (RMSGD|RMSGN)) == (RMSGD|RMSGN))
4499 return (EINVAL);
4500
4501 mutex_enter(&stp->sd_lock);
4502 switch (arg & RMODEMASK) {
4503 case RNORM:
4504 stp->sd_read_opt &= ~(RD_MSGDIS | RD_MSGNODIS);
4505 break;
4506 case RMSGD:
4507 stp->sd_read_opt = (stp->sd_read_opt & ~RD_MSGNODIS) |
4508 RD_MSGDIS;
4509 break;
4510 case RMSGN:
4511 stp->sd_read_opt = (stp->sd_read_opt & ~RD_MSGDIS) |
4512 RD_MSGNODIS;
4513 break;
4514 }
4515
4516 switch (arg & RPROTMASK) {
4517 case RPROTNORM:
4518 stp->sd_read_opt &= ~(RD_PROTDAT | RD_PROTDIS);
4519 break;
4520
4521 case RPROTDAT:
4522 stp->sd_read_opt = ((stp->sd_read_opt & ~RD_PROTDIS) |
4523 RD_PROTDAT);
4524 break;
4525
4526 case RPROTDIS:
4527 stp->sd_read_opt = ((stp->sd_read_opt & ~RD_PROTDAT) |
4528 RD_PROTDIS);
4529 break;
4530 }
4531 mutex_exit(&stp->sd_lock);
4532 return (0);
4533
4534 case I_GRDOPT:
4535 /*
4536 * Get read option and return the value
4537 * to spot pointed to by arg
4538 */
4539 {
4540 int rdopt;
4541
4542 rdopt = ((stp->sd_read_opt & RD_MSGDIS) ? RMSGD :
4543 ((stp->sd_read_opt & RD_MSGNODIS) ? RMSGN : RNORM));
4544 rdopt |= ((stp->sd_read_opt & RD_PROTDAT) ? RPROTDAT :
4545 ((stp->sd_read_opt & RD_PROTDIS) ? RPROTDIS : RPROTNORM));
4546
4547 return (strcopyout(&rdopt, (void *)arg, sizeof (int),
4548 copyflag));
4549 }
4550
4551 case I_SERROPT:
4552 /*
4553 * Set error options
4554 *
4555 * RERRNORM - persistent read errors
4556 * RERRNONPERSIST - non-persistent read errors
4557 * WERRNORM - persistent write errors
4558 * WERRNONPERSIST - non-persistent write errors
4559 */
4560 if (arg & ~(RERRMASK | WERRMASK))
4561 return (EINVAL);
4562
4563 mutex_enter(&stp->sd_lock);
4564 switch (arg & RERRMASK) {
4565 case RERRNORM:
4566 stp->sd_flag &= ~STRDERRNONPERSIST;
4567 break;
4568 case RERRNONPERSIST:
4569 stp->sd_flag |= STRDERRNONPERSIST;
4570 break;
4571 }
4572 switch (arg & WERRMASK) {
4573 case WERRNORM:
4574 stp->sd_flag &= ~STWRERRNONPERSIST;
4575 break;
4576 case WERRNONPERSIST:
4577 stp->sd_flag |= STWRERRNONPERSIST;
4578 break;
4579 }
4580 mutex_exit(&stp->sd_lock);
4581 return (0);
4582
4583 case I_GERROPT:
4584 /*
4585 * Get error option and return the value
4586 * to spot pointed to by arg
4587 */
4588 {
4589 int erropt = 0;
4590
4591 erropt |= (stp->sd_flag & STRDERRNONPERSIST) ? RERRNONPERSIST :
4592 RERRNORM;
4593 erropt |= (stp->sd_flag & STWRERRNONPERSIST) ? WERRNONPERSIST :
4594 WERRNORM;
4595 return (strcopyout(&erropt, (void *)arg, sizeof (int),
4596 copyflag));
4597 }
4598
4599 case I_SETSIG:
4600 /*
4601 * Register the calling proc to receive the SIGPOLL
4602 * signal based on the events given in arg. If
4603 * arg is zero, remove the proc from register list.
4604 */
4605 {
4606 strsig_t *ssp, *pssp;
4607 struct pid *pidp;
4608
4609 pssp = NULL;
4610 pidp = curproc->p_pidp;
4611 /*
4612 * Hold sd_lock to prevent traversal of sd_siglist while
4613 * it is modified.
4614 */
4615 mutex_enter(&stp->sd_lock);
4616 for (ssp = stp->sd_siglist; ssp && (ssp->ss_pidp != pidp);
4617 pssp = ssp, ssp = ssp->ss_next)
4618 ;
4619
4620 if (arg) {
4621 if (arg & ~(S_INPUT|S_HIPRI|S_MSG|S_HANGUP|S_ERROR|
4622 S_RDNORM|S_WRNORM|S_RDBAND|S_WRBAND|S_BANDURG)) {
4623 mutex_exit(&stp->sd_lock);
4624 return (EINVAL);
4625 }
4626 if ((arg & S_BANDURG) && !(arg & S_RDBAND)) {
4627 mutex_exit(&stp->sd_lock);
4628 return (EINVAL);
4629 }
4630
4631 /*
4632 * If proc not already registered, add it
4633 * to list.
4634 */
4635 if (!ssp) {
4636 ssp = kmem_alloc(sizeof (strsig_t), KM_SLEEP);
4637 ssp->ss_pidp = pidp;
4638 ssp->ss_pid = pidp->pid_id;
4639 ssp->ss_next = NULL;
4640 if (pssp)
4641 pssp->ss_next = ssp;
4642 else
4643 stp->sd_siglist = ssp;
4644 mutex_enter(&pidlock);
4645 PID_HOLD(pidp);
4646 mutex_exit(&pidlock);
4647 }
4648
4649 /*
4650 * Set events.
4651 */
4652 ssp->ss_events = (int)arg;
4653 } else {
4654 /*
4655 * Remove proc from register list.
4656 */
4657 if (ssp) {
4658 mutex_enter(&pidlock);
4659 PID_RELE(pidp);
4660 mutex_exit(&pidlock);
4661 if (pssp)
4662 pssp->ss_next = ssp->ss_next;
4663 else
4664 stp->sd_siglist = ssp->ss_next;
4665 kmem_free(ssp, sizeof (strsig_t));
4666 } else {
4667 mutex_exit(&stp->sd_lock);
4668 return (EINVAL);
4669 }
4670 }
4671
4672 /*
4673 * Recalculate OR of sig events.
4674 */
4675 stp->sd_sigflags = 0;
4676 for (ssp = stp->sd_siglist; ssp; ssp = ssp->ss_next)
4677 stp->sd_sigflags |= ssp->ss_events;
4678 mutex_exit(&stp->sd_lock);
4679 return (0);
4680 }
4681
4682 case I_GETSIG:
4683 /*
4684 * Return (in arg) the current registration of events
4685 * for which the calling proc is to be signaled.
4686 */
4687 {
4688 struct strsig *ssp;
4689 struct pid *pidp;
4690
4691 pidp = curproc->p_pidp;
4692 mutex_enter(&stp->sd_lock);
4693 for (ssp = stp->sd_siglist; ssp; ssp = ssp->ss_next)
4694 if (ssp->ss_pidp == pidp) {
4695 error = strcopyout(&ssp->ss_events, (void *)arg,
4696 sizeof (int), copyflag);
4697 mutex_exit(&stp->sd_lock);
4698 return (error);
4699 }
4700 mutex_exit(&stp->sd_lock);
4701 return (EINVAL);
4702 }
4703
4704 case I_ESETSIG:
4705 /*
4706 * Register the ss_pid to receive the SIGPOLL
4707 * signal based on the events is ss_events arg. If
4708 * ss_events is zero, remove the proc from register list.
4709 */
4710 {
4711 struct strsig *ssp, *pssp;
4712 struct proc *proc;
4713 struct pid *pidp;
4714 pid_t pid;
4715 struct strsigset ss;
4716
4717 error = strcopyin((void *)arg, &ss, sizeof (ss), copyflag);
4718 if (error)
4719 return (error);
4720
4721 pid = ss.ss_pid;
4722
4723 if (ss.ss_events != 0) {
4724 /*
4725 * Permissions check by sending signal 0.
4726 * Note that when kill fails it does a set_errno
4727 * causing the system call to fail.
4728 */
4729 error = kill(pid, 0);
4730 if (error) {
4731 return (error);
4732 }
4733 }
4734 mutex_enter(&pidlock);
4735 if (pid == 0)
4736 proc = curproc;
4737 else if (pid < 0)
4738 proc = pgfind(-pid);
4739 else
4740 proc = prfind(pid);
4741 if (proc == NULL) {
4742 mutex_exit(&pidlock);
4743 return (ESRCH);
4744 }
4745 if (pid < 0)
4746 pidp = proc->p_pgidp;
4747 else
4748 pidp = proc->p_pidp;
4749 ASSERT(pidp);
4750 /*
4751 * Get a hold on the pid structure while referencing it.
4752 * There is a separate PID_HOLD should it be inserted
4753 * in the list below.
4754 */
4755 PID_HOLD(pidp);
4756 mutex_exit(&pidlock);
4757
4758 pssp = NULL;
4759 /*
4760 * Hold sd_lock to prevent traversal of sd_siglist while
4761 * it is modified.
4762 */
4763 mutex_enter(&stp->sd_lock);
4764 for (ssp = stp->sd_siglist; ssp && (ssp->ss_pid != pid);
4765 pssp = ssp, ssp = ssp->ss_next)
4766 ;
4767
4768 if (ss.ss_events) {
4769 if (ss.ss_events &
4770 ~(S_INPUT|S_HIPRI|S_MSG|S_HANGUP|S_ERROR|
4771 S_RDNORM|S_WRNORM|S_RDBAND|S_WRBAND|S_BANDURG)) {
4772 mutex_exit(&stp->sd_lock);
4773 mutex_enter(&pidlock);
4774 PID_RELE(pidp);
4775 mutex_exit(&pidlock);
4776 return (EINVAL);
4777 }
4778 if ((ss.ss_events & S_BANDURG) &&
4779 !(ss.ss_events & S_RDBAND)) {
4780 mutex_exit(&stp->sd_lock);
4781 mutex_enter(&pidlock);
4782 PID_RELE(pidp);
4783 mutex_exit(&pidlock);
4784 return (EINVAL);
4785 }
4786
4787 /*
4788 * If proc not already registered, add it
4789 * to list.
4790 */
4791 if (!ssp) {
4792 ssp = kmem_alloc(sizeof (strsig_t), KM_SLEEP);
4793 ssp->ss_pidp = pidp;
4794 ssp->ss_pid = pid;
4795 ssp->ss_next = NULL;
4796 if (pssp)
4797 pssp->ss_next = ssp;
4798 else
4799 stp->sd_siglist = ssp;
4800 mutex_enter(&pidlock);
4801 PID_HOLD(pidp);
4802 mutex_exit(&pidlock);
4803 }
4804
4805 /*
4806 * Set events.
4807 */
4808 ssp->ss_events = ss.ss_events;
4809 } else {
4810 /*
4811 * Remove proc from register list.
4812 */
4813 if (ssp) {
4814 mutex_enter(&pidlock);
4815 PID_RELE(pidp);
4816 mutex_exit(&pidlock);
4817 if (pssp)
4818 pssp->ss_next = ssp->ss_next;
4819 else
4820 stp->sd_siglist = ssp->ss_next;
4821 kmem_free(ssp, sizeof (strsig_t));
4822 } else {
4823 mutex_exit(&stp->sd_lock);
4824 mutex_enter(&pidlock);
4825 PID_RELE(pidp);
4826 mutex_exit(&pidlock);
4827 return (EINVAL);
4828 }
4829 }
4830
4831 /*
4832 * Recalculate OR of sig events.
4833 */
4834 stp->sd_sigflags = 0;
4835 for (ssp = stp->sd_siglist; ssp; ssp = ssp->ss_next)
4836 stp->sd_sigflags |= ssp->ss_events;
4837 mutex_exit(&stp->sd_lock);
4838 mutex_enter(&pidlock);
4839 PID_RELE(pidp);
4840 mutex_exit(&pidlock);
4841 return (0);
4842 }
4843
4844 case I_EGETSIG:
4845 /*
4846 * Return (in arg) the current registration of events
4847 * for which the calling proc is to be signaled.
4848 */
4849 {
4850 struct strsig *ssp;
4851 struct proc *proc;
4852 pid_t pid;
4853 struct pid *pidp;
4854 struct strsigset ss;
4855
4856 error = strcopyin((void *)arg, &ss, sizeof (ss), copyflag);
4857 if (error)
4858 return (error);
4859
4860 pid = ss.ss_pid;
4861 mutex_enter(&pidlock);
4862 if (pid == 0)
4863 proc = curproc;
4864 else if (pid < 0)
4865 proc = pgfind(-pid);
4866 else
4867 proc = prfind(pid);
4868 if (proc == NULL) {
4869 mutex_exit(&pidlock);
4870 return (ESRCH);
4871 }
4872 if (pid < 0)
4873 pidp = proc->p_pgidp;
4874 else
4875 pidp = proc->p_pidp;
4876
4877 /* Prevent the pidp from being reassigned */
4878 PID_HOLD(pidp);
4879 mutex_exit(&pidlock);
4880
4881 mutex_enter(&stp->sd_lock);
4882 for (ssp = stp->sd_siglist; ssp; ssp = ssp->ss_next)
4883 if (ssp->ss_pid == pid) {
4884 ss.ss_pid = ssp->ss_pid;
4885 ss.ss_events = ssp->ss_events;
4886 error = strcopyout(&ss, (void *)arg,
4887 sizeof (struct strsigset), copyflag);
4888 mutex_exit(&stp->sd_lock);
4889 mutex_enter(&pidlock);
4890 PID_RELE(pidp);
4891 mutex_exit(&pidlock);
4892 return (error);
4893 }
4894 mutex_exit(&stp->sd_lock);
4895 mutex_enter(&pidlock);
4896 PID_RELE(pidp);
4897 mutex_exit(&pidlock);
4898 return (EINVAL);
4899 }
4900
4901 case I_PEEK:
4902 {
4903 STRUCT_DECL(strpeek, strpeek);
4904 size_t n;
4905 mblk_t *fmp, *tmp_mp = NULL;
4906
4907 STRUCT_INIT(strpeek, flag);
4908
4909 error = strcopyin((void *)arg, STRUCT_BUF(strpeek),
4910 STRUCT_SIZE(strpeek), copyflag);
4911 if (error)
4912 return (error);
4913
4914 mutex_enter(QLOCK(rdq));
4915 /*
4916 * Skip the invalid messages
4917 */
4918 for (mp = rdq->q_first; mp != NULL; mp = mp->b_next)
4919 if (mp->b_datap->db_type != M_SIG)
4920 break;
4921
4922 /*
4923 * If user has requested to peek at a high priority message
4924 * and first message is not, return 0
4925 */
4926 if (mp != NULL) {
4927 if ((STRUCT_FGET(strpeek, flags) & RS_HIPRI) &&
4928 queclass(mp) == QNORM) {
4929 *rvalp = 0;
4930 mutex_exit(QLOCK(rdq));
4931 return (0);
4932 }
4933 } else if (stp->sd_struiordq == NULL ||
4934 (STRUCT_FGET(strpeek, flags) & RS_HIPRI)) {
4935 /*
4936 * No mblks to look at at the streamhead and
4937 * 1). This isn't a synch stream or
4938 * 2). This is a synch stream but caller wants high
4939 * priority messages which is not supported by
4940 * the synch stream. (it only supports QNORM)
4941 */
4942 *rvalp = 0;
4943 mutex_exit(QLOCK(rdq));
4944 return (0);
4945 }
4946
4947 fmp = mp;
4948
4949 if (mp && mp->b_datap->db_type == M_PASSFP) {
4950 mutex_exit(QLOCK(rdq));
4951 return (EBADMSG);
4952 }
4953
4954 ASSERT(mp == NULL || mp->b_datap->db_type == M_PCPROTO ||
4955 mp->b_datap->db_type == M_PROTO ||
4956 mp->b_datap->db_type == M_DATA);
4957
4958 if (mp && mp->b_datap->db_type == M_PCPROTO) {
4959 STRUCT_FSET(strpeek, flags, RS_HIPRI);
4960 } else {
4961 STRUCT_FSET(strpeek, flags, 0);
4962 }
4963
4964
4965 if (mp && ((tmp_mp = dupmsg(mp)) == NULL)) {
4966 mutex_exit(QLOCK(rdq));
4967 return (ENOSR);
4968 }
4969 mutex_exit(QLOCK(rdq));
4970
4971 /*
4972 * set mp = tmp_mp, so that I_PEEK processing can continue.
4973 * tmp_mp is used to free the dup'd message.
4974 */
4975 mp = tmp_mp;
4976
4977 uio.uio_fmode = 0;
4978 uio.uio_extflg = UIO_COPY_CACHED;
4979 uio.uio_segflg = (copyflag == U_TO_K) ? UIO_USERSPACE :
4980 UIO_SYSSPACE;
4981 uio.uio_limit = 0;
4982 /*
4983 * First process PROTO blocks, if any.
4984 * If user doesn't want to get ctl info by setting maxlen <= 0,
4985 * then set len to -1/0 and skip control blocks part.
4986 */
4987 if (STRUCT_FGET(strpeek, ctlbuf.maxlen) < 0)
4988 STRUCT_FSET(strpeek, ctlbuf.len, -1);
4989 else if (STRUCT_FGET(strpeek, ctlbuf.maxlen) == 0)
4990 STRUCT_FSET(strpeek, ctlbuf.len, 0);
4991 else {
4992 int ctl_part = 0;
4993
4994 iov.iov_base = STRUCT_FGETP(strpeek, ctlbuf.buf);
4995 iov.iov_len = STRUCT_FGET(strpeek, ctlbuf.maxlen);
4996 uio.uio_iov = &iov;
4997 uio.uio_resid = iov.iov_len;
4998 uio.uio_loffset = 0;
4999 uio.uio_iovcnt = 1;
5000 while (mp && mp->b_datap->db_type != M_DATA &&
5001 uio.uio_resid >= 0) {
5002 ASSERT(STRUCT_FGET(strpeek, flags) == 0 ?
5003 mp->b_datap->db_type == M_PROTO :
5004 mp->b_datap->db_type == M_PCPROTO);
5005
5006 if ((n = MIN(uio.uio_resid,
5007 mp->b_wptr - mp->b_rptr)) != 0 &&
5008 (error = uiomove((char *)mp->b_rptr, n,
5009 UIO_READ, &uio)) != 0) {
5010 freemsg(tmp_mp);
5011 return (error);
5012 }
5013 ctl_part = 1;
5014 mp = mp->b_cont;
5015 }
5016 /* No ctl message */
5017 if (ctl_part == 0)
5018 STRUCT_FSET(strpeek, ctlbuf.len, -1);
5019 else
5020 STRUCT_FSET(strpeek, ctlbuf.len,
5021 STRUCT_FGET(strpeek, ctlbuf.maxlen) -
5022 uio.uio_resid);
5023 }
5024
5025 /*
5026 * Now process DATA blocks, if any.
5027 * If user doesn't want to get data info by setting maxlen <= 0,
5028 * then set len to -1/0 and skip data blocks part.
5029 */
5030 if (STRUCT_FGET(strpeek, databuf.maxlen) < 0)
5031 STRUCT_FSET(strpeek, databuf.len, -1);
5032 else if (STRUCT_FGET(strpeek, databuf.maxlen) == 0)
5033 STRUCT_FSET(strpeek, databuf.len, 0);
5034 else {
5035 int data_part = 0;
5036
5037 iov.iov_base = STRUCT_FGETP(strpeek, databuf.buf);
5038 iov.iov_len = STRUCT_FGET(strpeek, databuf.maxlen);
5039 uio.uio_iov = &iov;
5040 uio.uio_resid = iov.iov_len;
5041 uio.uio_loffset = 0;
5042 uio.uio_iovcnt = 1;
5043 while (mp && uio.uio_resid) {
5044 if (mp->b_datap->db_type == M_DATA) {
5045 if ((n = MIN(uio.uio_resid,
5046 mp->b_wptr - mp->b_rptr)) != 0 &&
5047 (error = uiomove((char *)mp->b_rptr,
5048 n, UIO_READ, &uio)) != 0) {
5049 freemsg(tmp_mp);
5050 return (error);
5051 }
5052 data_part = 1;
5053 }
5054 ASSERT(data_part == 0 ||
5055 mp->b_datap->db_type == M_DATA);
5056 mp = mp->b_cont;
5057 }
5058 /* No data message */
5059 if (data_part == 0)
5060 STRUCT_FSET(strpeek, databuf.len, -1);
5061 else
5062 STRUCT_FSET(strpeek, databuf.len,
5063 STRUCT_FGET(strpeek, databuf.maxlen) -
5064 uio.uio_resid);
5065 }
5066 freemsg(tmp_mp);
5067
5068 /*
5069 * It is a synch stream and user wants to get
5070 * data (maxlen > 0).
5071 * uio setup is done by the codes that process DATA
5072 * blocks above.
5073 */
5074 if ((fmp == NULL) && STRUCT_FGET(strpeek, databuf.maxlen) > 0) {
5075 infod_t infod;
5076
5077 infod.d_cmd = INFOD_COPYOUT;
5078 infod.d_res = 0;
5079 infod.d_uiop = &uio;
5080 error = infonext(rdq, &infod);
5081 if (error == EINVAL || error == EBUSY)
5082 error = 0;
5083 if (error)
5084 return (error);
5085 STRUCT_FSET(strpeek, databuf.len, STRUCT_FGET(strpeek,
5086 databuf.maxlen) - uio.uio_resid);
5087 if (STRUCT_FGET(strpeek, databuf.len) == 0) {
5088 /*
5089 * No data found by the infonext().
5090 */
5091 STRUCT_FSET(strpeek, databuf.len, -1);
5092 }
5093 }
5094 error = strcopyout(STRUCT_BUF(strpeek), (void *)arg,
5095 STRUCT_SIZE(strpeek), copyflag);
5096 if (error) {
5097 return (error);
5098 }
5099 /*
5100 * If there is no message retrieved, set return code to 0
5101 * otherwise, set it to 1.
5102 */
5103 if (STRUCT_FGET(strpeek, ctlbuf.len) == -1 &&
5104 STRUCT_FGET(strpeek, databuf.len) == -1)
5105 *rvalp = 0;
5106 else
5107 *rvalp = 1;
5108 return (0);
5109 }
5110
5111 case I_FDINSERT:
5112 {
5113 STRUCT_DECL(strfdinsert, strfdinsert);
5114 struct file *resftp;
5115 struct stdata *resstp;
5116 t_uscalar_t ival;
5117 ssize_t msgsize;
5118 struct strbuf mctl;
5119
5120 STRUCT_INIT(strfdinsert, flag);
5121 if (stp->sd_flag & STRHUP)
5122 return (ENXIO);
5123 /*
5124 * STRDERR, STWRERR and STPLEX tested above.
5125 */
5126 error = strcopyin((void *)arg, STRUCT_BUF(strfdinsert),
5127 STRUCT_SIZE(strfdinsert), copyflag);
5128 if (error)
5129 return (error);
5130
5131 if (STRUCT_FGET(strfdinsert, offset) < 0 ||
5132 (STRUCT_FGET(strfdinsert, offset) %
5133 sizeof (t_uscalar_t)) != 0)
5134 return (EINVAL);
5135 if ((resftp = getf(STRUCT_FGET(strfdinsert, fildes))) != NULL) {
5136 if ((resstp = resftp->f_vnode->v_stream) == NULL) {
5137 releasef(STRUCT_FGET(strfdinsert, fildes));
5138 return (EINVAL);
5139 }
5140 } else
5141 return (EINVAL);
5142
5143 mutex_enter(&resstp->sd_lock);
5144 if (resstp->sd_flag & (STRDERR|STWRERR|STRHUP|STPLEX)) {
5145 error = strgeterr(resstp,
5146 STRDERR|STWRERR|STRHUP|STPLEX, 0);
5147 if (error != 0) {
5148 mutex_exit(&resstp->sd_lock);
5149 releasef(STRUCT_FGET(strfdinsert, fildes));
5150 return (error);
5151 }
5152 }
5153 mutex_exit(&resstp->sd_lock);
5154
5155 #ifdef _ILP32
5156 {
5157 queue_t *q;
5158 queue_t *mate = NULL;
5159
5160 /* get read queue of stream terminus */
5161 claimstr(resstp->sd_wrq);
5162 for (q = resstp->sd_wrq->q_next; q->q_next != NULL;
5163 q = q->q_next)
5164 if (!STRMATED(resstp) && STREAM(q) != resstp &&
5165 mate == NULL) {
5166 ASSERT(q->q_qinfo->qi_srvp);
5167 ASSERT(_OTHERQ(q)->q_qinfo->qi_srvp);
5168 claimstr(q);
5169 mate = q;
5170 }
5171 q = _RD(q);
5172 if (mate)
5173 releasestr(mate);
5174 releasestr(resstp->sd_wrq);
5175 ival = (t_uscalar_t)q;
5176 }
5177 #else
5178 ival = (t_uscalar_t)getminor(resftp->f_vnode->v_rdev);
5179 #endif /* _ILP32 */
5180
5181 if (STRUCT_FGET(strfdinsert, ctlbuf.len) <
5182 STRUCT_FGET(strfdinsert, offset) + sizeof (t_uscalar_t)) {
5183 releasef(STRUCT_FGET(strfdinsert, fildes));
5184 return (EINVAL);
5185 }
5186
5187 /*
5188 * Check for legal flag value.
5189 */
5190 if (STRUCT_FGET(strfdinsert, flags) & ~RS_HIPRI) {
5191 releasef(STRUCT_FGET(strfdinsert, fildes));
5192 return (EINVAL);
5193 }
5194
5195 /* get these values from those cached in the stream head */
5196 mutex_enter(QLOCK(stp->sd_wrq));
5197 rmin = stp->sd_qn_minpsz;
5198 rmax = stp->sd_qn_maxpsz;
5199 mutex_exit(QLOCK(stp->sd_wrq));
5200
5201 /*
5202 * Make sure ctl and data sizes together fall within
5203 * the limits of the max and min receive packet sizes
5204 * and do not exceed system limit. A negative data
5205 * length means that no data part is to be sent.
5206 */
5207 ASSERT((rmax >= 0) || (rmax == INFPSZ));
5208 if (rmax == 0) {
5209 releasef(STRUCT_FGET(strfdinsert, fildes));
5210 return (ERANGE);
5211 }
5212 if ((msgsize = STRUCT_FGET(strfdinsert, databuf.len)) < 0)
5213 msgsize = 0;
5214 if ((msgsize < rmin) ||
5215 ((msgsize > rmax) && (rmax != INFPSZ)) ||
5216 (STRUCT_FGET(strfdinsert, ctlbuf.len) > strctlsz)) {
5217 releasef(STRUCT_FGET(strfdinsert, fildes));
5218 return (ERANGE);
5219 }
5220
5221 mutex_enter(&stp->sd_lock);
5222 while (!(STRUCT_FGET(strfdinsert, flags) & RS_HIPRI) &&
5223 !canputnext(stp->sd_wrq)) {
5224 if ((error = strwaitq(stp, WRITEWAIT, (ssize_t)0,
5225 flag, -1, &done)) != 0 || done) {
5226 mutex_exit(&stp->sd_lock);
5227 releasef(STRUCT_FGET(strfdinsert, fildes));
5228 return (error);
5229 }
5230 if ((error = i_straccess(stp, access)) != 0) {
5231 mutex_exit(&stp->sd_lock);
5232 releasef(
5233 STRUCT_FGET(strfdinsert, fildes));
5234 return (error);
5235 }
5236 }
5237 mutex_exit(&stp->sd_lock);
5238
5239 /*
5240 * Copy strfdinsert.ctlbuf into native form of
5241 * ctlbuf to pass down into strmakemsg().
5242 */
5243 mctl.maxlen = STRUCT_FGET(strfdinsert, ctlbuf.maxlen);
5244 mctl.len = STRUCT_FGET(strfdinsert, ctlbuf.len);
5245 mctl.buf = STRUCT_FGETP(strfdinsert, ctlbuf.buf);
5246
5247 iov.iov_base = STRUCT_FGETP(strfdinsert, databuf.buf);
5248 iov.iov_len = STRUCT_FGET(strfdinsert, databuf.len);
5249 uio.uio_iov = &iov;
5250 uio.uio_iovcnt = 1;
5251 uio.uio_loffset = 0;
5252 uio.uio_segflg = (copyflag == U_TO_K) ? UIO_USERSPACE :
5253 UIO_SYSSPACE;
5254 uio.uio_fmode = 0;
5255 uio.uio_extflg = UIO_COPY_CACHED;
5256 uio.uio_resid = iov.iov_len;
5257 if ((error = strmakemsg(&mctl,
5258 &msgsize, &uio, stp,
5259 STRUCT_FGET(strfdinsert, flags), &mp)) != 0 || !mp) {
5260 STRUCT_FSET(strfdinsert, databuf.len, msgsize);
5261 releasef(STRUCT_FGET(strfdinsert, fildes));
5262 return (error);
5263 }
5264
5265 STRUCT_FSET(strfdinsert, databuf.len, msgsize);
5266
5267 /*
5268 * Place the possibly reencoded queue pointer 'offset' bytes
5269 * from the start of the control portion of the message.
5270 */
5271 *((t_uscalar_t *)(mp->b_rptr +
5272 STRUCT_FGET(strfdinsert, offset))) = ival;
5273
5274 /*
5275 * Put message downstream.
5276 */
5277 stream_willservice(stp);
5278 putnext(stp->sd_wrq, mp);
5279 stream_runservice(stp);
5280 releasef(STRUCT_FGET(strfdinsert, fildes));
5281 return (error);
5282 }
5283
5284 case I_SENDFD:
5285 {
5286 struct file *fp;
5287
5288 if ((fp = getf((int)arg)) == NULL)
5289 return (EBADF);
5290 error = do_sendfp(stp, fp, crp);
5291 if (auditing) {
5292 audit_fdsend((int)arg, fp, error);
5293 }
5294 releasef((int)arg);
5295 return (error);
5296 }
5297
5298 case I_RECVFD:
5299 case I_E_RECVFD:
5300 {
5301 struct k_strrecvfd *srf;
5302 int i, fd;
5303
5304 mutex_enter(&stp->sd_lock);
5305 while (!(mp = getq(rdq))) {
5306 if (stp->sd_flag & (STRHUP|STREOF)) {
5307 mutex_exit(&stp->sd_lock);
5308 return (ENXIO);
5309 }
5310 if ((error = strwaitq(stp, GETWAIT, (ssize_t)0,
5311 flag, -1, &done)) != 0 || done) {
5312 mutex_exit(&stp->sd_lock);
5313 return (error);
5314 }
5315 if ((error = i_straccess(stp, access)) != 0) {
5316 mutex_exit(&stp->sd_lock);
5317 return (error);
5318 }
5319 }
5320 if (mp->b_datap->db_type != M_PASSFP) {
5321 putback(stp, rdq, mp, mp->b_band);
5322 mutex_exit(&stp->sd_lock);
5323 return (EBADMSG);
5324 }
5325 mutex_exit(&stp->sd_lock);
5326
5327 srf = (struct k_strrecvfd *)mp->b_rptr;
5328 if ((fd = ufalloc(0)) == -1) {
5329 mutex_enter(&stp->sd_lock);
5330 putback(stp, rdq, mp, mp->b_band);
5331 mutex_exit(&stp->sd_lock);
5332 return (EMFILE);
5333 }
5334 if (cmd == I_RECVFD) {
5335 struct o_strrecvfd ostrfd;
5336
5337 /* check to see if uid/gid values are too large. */
5338
5339 if (srf->uid > (o_uid_t)USHRT_MAX ||
5340 srf->gid > (o_gid_t)USHRT_MAX) {
5341 mutex_enter(&stp->sd_lock);
5342 putback(stp, rdq, mp, mp->b_band);
5343 mutex_exit(&stp->sd_lock);
5344 setf(fd, NULL); /* release fd entry */
5345 return (EOVERFLOW);
5346 }
5347
5348 ostrfd.fd = fd;
5349 ostrfd.uid = (o_uid_t)srf->uid;
5350 ostrfd.gid = (o_gid_t)srf->gid;
5351
5352 /* Null the filler bits */
5353 for (i = 0; i < 8; i++)
5354 ostrfd.fill[i] = 0;
5355
5356 error = strcopyout(&ostrfd, (void *)arg,
5357 sizeof (struct o_strrecvfd), copyflag);
5358 } else { /* I_E_RECVFD */
5359 struct strrecvfd strfd;
5360
5361 strfd.fd = fd;
5362 strfd.uid = srf->uid;
5363 strfd.gid = srf->gid;
5364
5365 /* null the filler bits */
5366 for (i = 0; i < 8; i++)
5367 strfd.fill[i] = 0;
5368
5369 error = strcopyout(&strfd, (void *)arg,
5370 sizeof (struct strrecvfd), copyflag);
5371 }
5372
5373 if (error) {
5374 setf(fd, NULL); /* release fd entry */
5375 mutex_enter(&stp->sd_lock);
5376 putback(stp, rdq, mp, mp->b_band);
5377 mutex_exit(&stp->sd_lock);
5378 return (error);
5379 }
5380 if (auditing) {
5381 audit_fdrecv(fd, srf->fp);
5382 }
5383
5384 /*
5385 * Always increment f_count since the freemsg() below will
5386 * always call free_passfp() which performs a closef().
5387 */
5388 mutex_enter(&srf->fp->f_tlock);
5389 srf->fp->f_count++;
5390 mutex_exit(&srf->fp->f_tlock);
5391 setf(fd, srf->fp);
5392 freemsg(mp);
5393 return (0);
5394 }
5395
5396 case I_SWROPT:
5397 /*
5398 * Set/clear the write options. arg is a bit
5399 * mask with any of the following bits set...
5400 * SNDZERO - send zero length message
5401 * SNDPIPE - send sigpipe to process if
5402 * sd_werror is set and process is
5403 * doing a write or putmsg.
5404 * The new stream head write options should reflect
5405 * what is in arg.
5406 */
5407 if (arg & ~(SNDZERO|SNDPIPE))
5408 return (EINVAL);
5409
5410 mutex_enter(&stp->sd_lock);
5411 stp->sd_wput_opt &= ~(SW_SIGPIPE|SW_SNDZERO);
5412 if (arg & SNDZERO)
5413 stp->sd_wput_opt |= SW_SNDZERO;
5414 if (arg & SNDPIPE)
5415 stp->sd_wput_opt |= SW_SIGPIPE;
5416 mutex_exit(&stp->sd_lock);
5417 return (0);
5418
5419 case I_GWROPT:
5420 {
5421 int wropt = 0;
5422
5423 if (stp->sd_wput_opt & SW_SNDZERO)
5424 wropt |= SNDZERO;
5425 if (stp->sd_wput_opt & SW_SIGPIPE)
5426 wropt |= SNDPIPE;
5427 return (strcopyout(&wropt, (void *)arg, sizeof (wropt),
5428 copyflag));
5429 }
5430
5431 case I_LIST:
5432 /*
5433 * Returns all the modules found on this stream,
5434 * upto the driver. If argument is NULL, return the
5435 * number of modules (including driver). If argument
5436 * is not NULL, copy the names into the structure
5437 * provided.
5438 */
5439
5440 {
5441 queue_t *q;
5442 char *qname;
5443 int i, nmods;
5444 struct str_mlist *mlist;
5445 STRUCT_DECL(str_list, strlist);
5446
5447 if (arg == NULL) { /* Return number of modules plus driver */
5448 if (stp->sd_vnode->v_type == VFIFO)
5449 *rvalp = stp->sd_pushcnt;
5450 else
5451 *rvalp = stp->sd_pushcnt + 1;
5452 return (0);
5453 }
5454
5455 STRUCT_INIT(strlist, flag);
5456
5457 error = strcopyin((void *)arg, STRUCT_BUF(strlist),
5458 STRUCT_SIZE(strlist), copyflag);
5459 if (error != 0)
5460 return (error);
5461
5462 mlist = STRUCT_FGETP(strlist, sl_modlist);
5463 nmods = STRUCT_FGET(strlist, sl_nmods);
5464 if (nmods <= 0)
5465 return (EINVAL);
5466
5467 claimstr(stp->sd_wrq);
5468 q = stp->sd_wrq;
5469 for (i = 0; i < nmods && _SAMESTR(q); i++, q = q->q_next) {
5470 qname = Q2NAME(q->q_next);
5471 error = strcopyout(qname, &mlist[i], strlen(qname) + 1,
5472 copyflag);
5473 if (error != 0) {
5474 releasestr(stp->sd_wrq);
5475 return (error);
5476 }
5477 }
5478 releasestr(stp->sd_wrq);
5479 return (strcopyout(&i, (void *)arg, sizeof (int), copyflag));
5480 }
5481
5482 case I_CKBAND:
5483 {
5484 queue_t *q;
5485 qband_t *qbp;
5486
5487 if ((arg < 0) || (arg >= NBAND))
5488 return (EINVAL);
5489 q = _RD(stp->sd_wrq);
5490 mutex_enter(QLOCK(q));
5491 if (arg > (int)q->q_nband) {
5492 *rvalp = 0;
5493 } else {
5494 if (arg == 0) {
5495 if (q->q_first)
5496 *rvalp = 1;
5497 else
5498 *rvalp = 0;
5499 } else {
5500 qbp = q->q_bandp;
5501 while (--arg > 0)
5502 qbp = qbp->qb_next;
5503 if (qbp->qb_first)
5504 *rvalp = 1;
5505 else
5506 *rvalp = 0;
5507 }
5508 }
5509 mutex_exit(QLOCK(q));
5510 return (0);
5511 }
5512
5513 case I_GETBAND:
5514 {
5515 int intpri;
5516 queue_t *q;
5517
5518 q = _RD(stp->sd_wrq);
5519 mutex_enter(QLOCK(q));
5520 mp = q->q_first;
5521 if (!mp) {
5522 mutex_exit(QLOCK(q));
5523 return (ENODATA);
5524 }
5525 intpri = (int)mp->b_band;
5526 error = strcopyout(&intpri, (void *)arg, sizeof (int),
5527 copyflag);
5528 mutex_exit(QLOCK(q));
5529 return (error);
5530 }
5531
5532 case I_ATMARK:
5533 {
5534 queue_t *q;
5535
5536 if (arg & ~(ANYMARK|LASTMARK))
5537 return (EINVAL);
5538 q = _RD(stp->sd_wrq);
5539 mutex_enter(&stp->sd_lock);
5540 if ((stp->sd_flag & STRATMARK) && (arg == ANYMARK)) {
5541 *rvalp = 1;
5542 } else {
5543 mutex_enter(QLOCK(q));
5544 mp = q->q_first;
5545
5546 if (mp == NULL)
5547 *rvalp = 0;
5548 else if ((arg == ANYMARK) && (mp->b_flag & MSGMARK))
5549 *rvalp = 1;
5550 else if ((arg == LASTMARK) && (mp == stp->sd_mark))
5551 *rvalp = 1;
5552 else
5553 *rvalp = 0;
5554 mutex_exit(QLOCK(q));
5555 }
5556 mutex_exit(&stp->sd_lock);
5557 return (0);
5558 }
5559
5560 case I_CANPUT:
5561 {
5562 char band;
5563
5564 if ((arg < 0) || (arg >= NBAND))
5565 return (EINVAL);
5566 band = (char)arg;
5567 *rvalp = bcanputnext(stp->sd_wrq, band);
5568 return (0);
5569 }
5570
5571 case I_SETCLTIME:
5572 {
5573 int closetime;
5574
5575 error = strcopyin((void *)arg, &closetime, sizeof (int),
5576 copyflag);
5577 if (error)
5578 return (error);
5579 if (closetime < 0)
5580 return (EINVAL);
5581
5582 stp->sd_closetime = closetime;
5583 return (0);
5584 }
5585
5586 case I_GETCLTIME:
5587 {
5588 int closetime;
5589
5590 closetime = stp->sd_closetime;
5591 return (strcopyout(&closetime, (void *)arg, sizeof (int),
5592 copyflag));
5593 }
5594
5595 case TIOCGSID:
5596 {
5597 pid_t sid;
5598
5599 mutex_enter(&stp->sd_lock);
5600 if (stp->sd_sidp == NULL) {
5601 mutex_exit(&stp->sd_lock);
5602 return (ENOTTY);
5603 }
5604 sid = stp->sd_sidp->pid_id;
5605 mutex_exit(&stp->sd_lock);
5606 return (strcopyout(&sid, (void *)arg, sizeof (pid_t),
5607 copyflag));
5608 }
5609
5610 case TIOCSPGRP:
5611 {
5612 pid_t pgrp;
5613 proc_t *q;
5614 pid_t sid, fg_pgid, bg_pgid;
5615
5616 if (error = strcopyin((void *)arg, &pgrp, sizeof (pid_t),
5617 copyflag))
5618 return (error);
5619 mutex_enter(&stp->sd_lock);
5620 mutex_enter(&pidlock);
5621 if (stp->sd_sidp != ttoproc(curthread)->p_sessp->s_sidp) {
5622 mutex_exit(&pidlock);
5623 mutex_exit(&stp->sd_lock);
5624 return (ENOTTY);
5625 }
5626 if (pgrp == stp->sd_pgidp->pid_id) {
5627 mutex_exit(&pidlock);
5628 mutex_exit(&stp->sd_lock);
5629 return (0);
5630 }
5631 if (pgrp <= 0 || pgrp >= maxpid) {
5632 mutex_exit(&pidlock);
5633 mutex_exit(&stp->sd_lock);
5634 return (EINVAL);
5635 }
5636 if ((q = pgfind(pgrp)) == NULL ||
5637 q->p_sessp != ttoproc(curthread)->p_sessp) {
5638 mutex_exit(&pidlock);
5639 mutex_exit(&stp->sd_lock);
5640 return (EPERM);
5641 }
5642 sid = stp->sd_sidp->pid_id;
5643 fg_pgid = q->p_pgrp;
5644 bg_pgid = stp->sd_pgidp->pid_id;
5645 CL_SET_PROCESS_GROUP(curthread, sid, bg_pgid, fg_pgid);
5646 PID_RELE(stp->sd_pgidp);
5647 ctty_clear_sighuped();
5648 stp->sd_pgidp = q->p_pgidp;
5649 PID_HOLD(stp->sd_pgidp);
5650 mutex_exit(&pidlock);
5651 mutex_exit(&stp->sd_lock);
5652 return (0);
5653 }
5654
5655 case TIOCGPGRP:
5656 {
5657 pid_t pgrp;
5658
5659 mutex_enter(&stp->sd_lock);
5660 if (stp->sd_sidp == NULL) {
5661 mutex_exit(&stp->sd_lock);
5662 return (ENOTTY);
5663 }
5664 pgrp = stp->sd_pgidp->pid_id;
5665 mutex_exit(&stp->sd_lock);
5666 return (strcopyout(&pgrp, (void *)arg, sizeof (pid_t),
5667 copyflag));
5668 }
5669
5670 case TIOCSCTTY:
5671 {
5672 return (strctty(stp));
5673 }
5674
5675 case TIOCNOTTY:
5676 {
5677 /* freectty() always assumes curproc. */
5678 if (freectty(B_FALSE) != 0)
5679 return (0);
5680 return (ENOTTY);
5681 }
5682
5683 case FIONBIO:
5684 case FIOASYNC:
5685 return (0); /* handled by the upper layer */
5686 }
5687 }
5688
5689 /*
5690 * Custom free routine used for M_PASSFP messages.
5691 */
5692 static void
5693 free_passfp(struct k_strrecvfd *srf)
5694 {
5695 (void) closef(srf->fp);
5696 kmem_free(srf, sizeof (struct k_strrecvfd) + sizeof (frtn_t));
5697 }
5698
5699 /* ARGSUSED */
5700 int
5701 do_sendfp(struct stdata *stp, struct file *fp, struct cred *cr)
5702 {
5703 queue_t *qp, *nextqp;
5704 struct k_strrecvfd *srf;
5705 mblk_t *mp;
5706 frtn_t *frtnp;
5707 size_t bufsize;
5708 queue_t *mate = NULL;
5709 syncq_t *sq = NULL;
5710 int retval = 0;
5711
5712 if (stp->sd_flag & STRHUP)
5713 return (ENXIO);
5714
5715 claimstr(stp->sd_wrq);
5716
5717 /* Fastpath, we have a pipe, and we are already mated, use it. */
5718 if (STRMATED(stp)) {
5719 qp = _RD(stp->sd_mate->sd_wrq);
5720 claimstr(qp);
5721 mate = qp;
5722 } else { /* Not already mated. */
5723
5724 /*
5725 * Walk the stream to the end of this one.
5726 * assumes that the claimstr() will prevent
5727 * plumbing between the stream head and the
5728 * driver from changing
5729 */
5730 qp = stp->sd_wrq;
5731
5732 /*
5733 * Loop until we reach the end of this stream.
5734 * On completion, qp points to the write queue
5735 * at the end of the stream, or the read queue
5736 * at the stream head if this is a fifo.
5737 */
5738 while (((qp = qp->q_next) != NULL) && _SAMESTR(qp))
5739 ;
5740
5741 /*
5742 * Just in case we get a q_next which is NULL, but
5743 * not at the end of the stream. This is actually
5744 * broken, so we set an assert to catch it in
5745 * debug, and set an error and return if not debug.
5746 */
5747 ASSERT(qp);
5748 if (qp == NULL) {
5749 releasestr(stp->sd_wrq);
5750 return (EINVAL);
5751 }
5752
5753 /*
5754 * Enter the syncq for the driver, so (hopefully)
5755 * the queue values will not change on us.
5756 * XXXX - This will only prevent the race IFF only
5757 * the write side modifies the q_next member, and
5758 * the put procedure is protected by at least
5759 * MT_PERQ.
5760 */
5761 if ((sq = qp->q_syncq) != NULL)
5762 entersq(sq, SQ_PUT);
5763
5764 /* Now get the q_next value from this qp. */
5765 nextqp = qp->q_next;
5766
5767 /*
5768 * If nextqp exists and the other stream is different
5769 * from this one claim the stream, set the mate, and
5770 * get the read queue at the stream head of the other
5771 * stream. Assumes that nextqp was at least valid when
5772 * we got it. Hopefully the entersq of the driver
5773 * will prevent it from changing on us.
5774 */
5775 if ((nextqp != NULL) && (STREAM(nextqp) != stp)) {
5776 ASSERT(qp->q_qinfo->qi_srvp);
5777 ASSERT(_OTHERQ(qp)->q_qinfo->qi_srvp);
5778 ASSERT(_OTHERQ(qp->q_next)->q_qinfo->qi_srvp);
5779 claimstr(nextqp);
5780
5781 /* Make sure we still have a q_next */
5782 if (nextqp != qp->q_next) {
5783 releasestr(stp->sd_wrq);
5784 releasestr(nextqp);
5785 return (EINVAL);
5786 }
5787
5788 qp = _RD(STREAM(nextqp)->sd_wrq);
5789 mate = qp;
5790 }
5791 /* If we entered the synq above, leave it. */
5792 if (sq != NULL)
5793 leavesq(sq, SQ_PUT);
5794 } /* STRMATED(STP) */
5795
5796 /* XXX prevents substitution of the ops vector */
5797 if (qp->q_qinfo != &strdata && qp->q_qinfo != &fifo_strdata) {
5798 retval = EINVAL;
5799 goto out;
5800 }
5801
5802 if (qp->q_flag & QFULL) {
5803 retval = EAGAIN;
5804 goto out;
5805 }
5806
5807 /*
5808 * Since M_PASSFP messages include a file descriptor, we use
5809 * esballoc() and specify a custom free routine (free_passfp()) that
5810 * will close the descriptor as part of freeing the message. For
5811 * convenience, we stash the frtn_t right after the data block.
5812 */
5813 bufsize = sizeof (struct k_strrecvfd) + sizeof (frtn_t);
5814 srf = kmem_alloc(bufsize, KM_NOSLEEP);
5815 if (srf == NULL) {
5816 retval = EAGAIN;
5817 goto out;
5818 }
5819
5820 frtnp = (frtn_t *)(srf + 1);
5821 frtnp->free_arg = (caddr_t)srf;
5822 frtnp->free_func = free_passfp;
5823
5824 mp = esballoc((uchar_t *)srf, bufsize, BPRI_MED, frtnp);
5825 if (mp == NULL) {
5826 kmem_free(srf, bufsize);
5827 retval = EAGAIN;
5828 goto out;
5829 }
5830 mp->b_wptr += sizeof (struct k_strrecvfd);
5831 mp->b_datap->db_type = M_PASSFP;
5832
5833 srf->fp = fp;
5834 srf->uid = crgetuid(curthread->t_cred);
5835 srf->gid = crgetgid(curthread->t_cred);
5836 mutex_enter(&fp->f_tlock);
5837 fp->f_count++;
5838 mutex_exit(&fp->f_tlock);
5839
5840 put(qp, mp);
5841 out:
5842 releasestr(stp->sd_wrq);
5843 if (mate)
5844 releasestr(mate);
5845 return (retval);
5846 }
5847
5848 /*
5849 * Send an ioctl message downstream and wait for acknowledgement.
5850 * flags may be set to either U_TO_K or K_TO_K and a combination
5851 * of STR_NOERROR or STR_NOSIG
5852 * STR_NOSIG: Signals are essentially ignored or held and have
5853 * no effect for the duration of the call.
5854 * STR_NOERROR: Ignores stream head read, write and hup errors.
5855 * Additionally, if an existing ioctl times out, it is assumed
5856 * lost and and this ioctl will continue as if the previous ioctl had
5857 * finished. ETIME may be returned if this ioctl times out (i.e.
5858 * ic_timout is not INFTIM). Non-stream head errors may be returned if
5859 * the ioc_error indicates that the driver/module had problems,
5860 * an EFAULT was found when accessing user data, a lack of
5861 * resources, etc.
5862 */
5863 int
5864 strdoioctl(
5865 struct stdata *stp,
5866 struct strioctl *strioc,
5867 int fflags, /* file flags with model info */
5868 int flag,
5869 cred_t *crp,
5870 int *rvalp)
5871 {
5872 mblk_t *bp;
5873 struct iocblk *iocbp;
5874 struct copyreq *reqp;
5875 struct copyresp *resp;
5876 int id;
5877 int transparent = 0;
5878 int error = 0;
5879 int len = 0;
5880 caddr_t taddr;
5881 int copyflag = (flag & (U_TO_K | K_TO_K));
5882 int sigflag = (flag & STR_NOSIG);
5883 int errs;
5884 uint_t waitflags;
5885 boolean_t set_iocwaitne = B_FALSE;
5886
5887 ASSERT(copyflag == U_TO_K || copyflag == K_TO_K);
5888 ASSERT((fflags & FMODELS) != 0);
5889
5890 TRACE_2(TR_FAC_STREAMS_FR,
5891 TR_STRDOIOCTL,
5892 "strdoioctl:stp %p strioc %p", stp, strioc);
5893 if (strioc->ic_len == TRANSPARENT) { /* send arg in M_DATA block */
5894 transparent = 1;
5895 strioc->ic_len = sizeof (intptr_t);
5896 }
5897
5898 if (strioc->ic_len < 0 || (strmsgsz > 0 && strioc->ic_len > strmsgsz))
5899 return (EINVAL);
5900
5901 if ((bp = allocb_cred_wait(sizeof (union ioctypes), sigflag, &error,
5902 crp, curproc->p_pid)) == NULL)
5903 return (error);
5904
5905 bzero(bp->b_wptr, sizeof (union ioctypes));
5906
5907 iocbp = (struct iocblk *)bp->b_wptr;
5908 iocbp->ioc_count = strioc->ic_len;
5909 iocbp->ioc_cmd = strioc->ic_cmd;
5910 iocbp->ioc_flag = (fflags & FMODELS);
5911
5912 crhold(crp);
5913 iocbp->ioc_cr = crp;
5914 DB_TYPE(bp) = M_IOCTL;
5915 bp->b_wptr += sizeof (struct iocblk);
5916
5917 if (flag & STR_NOERROR)
5918 errs = STPLEX;
5919 else
5920 errs = STRHUP|STRDERR|STWRERR|STPLEX;
5921
5922 /*
5923 * If there is data to copy into ioctl block, do so.
5924 */
5925 if (iocbp->ioc_count > 0) {
5926 if (transparent)
5927 /*
5928 * Note: STR_NOERROR does not have an effect
5929 * in putiocd()
5930 */
5931 id = K_TO_K | sigflag;
5932 else
5933 id = flag;
5934 if ((error = putiocd(bp, strioc->ic_dp, id, crp)) != 0) {
5935 freemsg(bp);
5936 crfree(crp);
5937 return (error);
5938 }
5939
5940 /*
5941 * We could have slept copying in user pages.
5942 * Recheck the stream head state (the other end
5943 * of a pipe could have gone away).
5944 */
5945 if (stp->sd_flag & errs) {
5946 mutex_enter(&stp->sd_lock);
5947 error = strgeterr(stp, errs, 0);
5948 mutex_exit(&stp->sd_lock);
5949 if (error != 0) {
5950 freemsg(bp);
5951 crfree(crp);
5952 return (error);
5953 }
5954 }
5955 }
5956 if (transparent)
5957 iocbp->ioc_count = TRANSPARENT;
5958
5959 /*
5960 * Block for up to STRTIMOUT milliseconds if there is an outstanding
5961 * ioctl for this stream already running. All processes
5962 * sleeping here will be awakened as a result of an ACK
5963 * or NAK being received for the outstanding ioctl, or
5964 * as a result of the timer expiring on the outstanding
5965 * ioctl (a failure), or as a result of any waiting
5966 * process's timer expiring (also a failure).
5967 */
5968
5969 error = 0;
5970 mutex_enter(&stp->sd_lock);
5971 while ((stp->sd_flag & IOCWAIT) ||
5972 (!set_iocwaitne && (stp->sd_flag & IOCWAITNE))) {
5973 clock_t cv_rval;
5974
5975 TRACE_0(TR_FAC_STREAMS_FR,
5976 TR_STRDOIOCTL_WAIT,
5977 "strdoioctl sleeps - IOCWAIT");
5978 cv_rval = str_cv_wait(&stp->sd_iocmonitor, &stp->sd_lock,
5979 STRTIMOUT, sigflag);
5980 if (cv_rval <= 0) {
5981 if (cv_rval == 0) {
5982 error = EINTR;
5983 } else {
5984 if (flag & STR_NOERROR) {
5985 /*
5986 * Terminating current ioctl in
5987 * progress -- assume it got lost and
5988 * wake up the other thread so that the
5989 * operation completes.
5990 */
5991 if (!(stp->sd_flag & IOCWAITNE)) {
5992 set_iocwaitne = B_TRUE;
5993 stp->sd_flag |= IOCWAITNE;
5994 cv_broadcast(&stp->sd_monitor);
5995 }
5996 /*
5997 * Otherwise, there's a running
5998 * STR_NOERROR -- we have no choice
5999 * here but to wait forever (or until
6000 * interrupted).
6001 */
6002 } else {
6003 /*
6004 * pending ioctl has caused
6005 * us to time out
6006 */
6007 error = ETIME;
6008 }
6009 }
6010 } else if ((stp->sd_flag & errs)) {
6011 error = strgeterr(stp, errs, 0);
6012 }
6013 if (error) {
6014 mutex_exit(&stp->sd_lock);
6015 freemsg(bp);
6016 crfree(crp);
6017 return (error);
6018 }
6019 }
6020
6021 /*
6022 * Have control of ioctl mechanism.
6023 * Send down ioctl packet and wait for response.
6024 */
6025 if (stp->sd_iocblk != (mblk_t *)-1) {
6026 freemsg(stp->sd_iocblk);
6027 }
6028 stp->sd_iocblk = NULL;
6029
6030 /*
6031 * If this is marked with 'noerror' (internal; mostly
6032 * I_{P,}{UN,}LINK), then make sure nobody else is able to get
6033 * in here by setting IOCWAITNE.
6034 */
6035 waitflags = IOCWAIT;
6036 if (flag & STR_NOERROR)
6037 waitflags |= IOCWAITNE;
6038
6039 stp->sd_flag |= waitflags;
6040
6041 /*
6042 * Assign sequence number.
6043 */
6044 iocbp->ioc_id = stp->sd_iocid = getiocseqno();
6045
6046 mutex_exit(&stp->sd_lock);
6047
6048 TRACE_1(TR_FAC_STREAMS_FR,
6049 TR_STRDOIOCTL_PUT, "strdoioctl put: stp %p", stp);
6050 stream_willservice(stp);
6051 putnext(stp->sd_wrq, bp);
6052 stream_runservice(stp);
6053
6054 /*
6055 * Timed wait for acknowledgment. The wait time is limited by the
6056 * timeout value, which must be a positive integer (number of
6057 * milliseconds) to wait, or 0 (use default value of STRTIMOUT
6058 * milliseconds), or -1 (wait forever). This will be awakened
6059 * either by an ACK/NAK message arriving, the timer expiring, or
6060 * the timer expiring on another ioctl waiting for control of the
6061 * mechanism.
6062 */
6063 waitioc:
6064 mutex_enter(&stp->sd_lock);
6065
6066
6067 /*
6068 * If the reply has already arrived, don't sleep. If awakened from
6069 * the sleep, fail only if the reply has not arrived by then.
6070 * Otherwise, process the reply.
6071 */
6072 while (!stp->sd_iocblk) {
6073 clock_t cv_rval;
6074
6075 if (stp->sd_flag & errs) {
6076 error = strgeterr(stp, errs, 0);
6077 if (error != 0) {
6078 stp->sd_flag &= ~waitflags;
6079 cv_broadcast(&stp->sd_iocmonitor);
6080 mutex_exit(&stp->sd_lock);
6081 crfree(crp);
6082 return (error);
6083 }
6084 }
6085
6086 TRACE_0(TR_FAC_STREAMS_FR,
6087 TR_STRDOIOCTL_WAIT2,
6088 "strdoioctl sleeps awaiting reply");
6089 ASSERT(error == 0);
6090
6091 cv_rval = str_cv_wait(&stp->sd_monitor, &stp->sd_lock,
6092 (strioc->ic_timout ?
6093 strioc->ic_timout * 1000 : STRTIMOUT), sigflag);
6094
6095 /*
6096 * There are four possible cases here: interrupt, timeout,
6097 * wakeup by IOCWAITNE (above), or wakeup by strrput_nondata (a
6098 * valid M_IOCTL reply).
6099 *
6100 * If we've been awakened by a STR_NOERROR ioctl on some other
6101 * thread, then sd_iocblk will still be NULL, and IOCWAITNE
6102 * will be set. Pretend as if we just timed out. Note that
6103 * this other thread waited at least STRTIMOUT before trying to
6104 * awaken our thread, so this is indistinguishable (even for
6105 * INFTIM) from the case where we failed with ETIME waiting on
6106 * IOCWAIT in the prior loop.
6107 */
6108 if (cv_rval > 0 && !(flag & STR_NOERROR) &&
6109 stp->sd_iocblk == NULL && (stp->sd_flag & IOCWAITNE)) {
6110 cv_rval = -1;
6111 }
6112
6113 /*
6114 * note: STR_NOERROR does not protect
6115 * us here.. use ic_timout < 0
6116 */
6117 if (cv_rval <= 0) {
6118 if (cv_rval == 0) {
6119 error = EINTR;
6120 } else {
6121 error = ETIME;
6122 }
6123 /*
6124 * A message could have come in after we were scheduled
6125 * but before we were actually run.
6126 */
6127 bp = stp->sd_iocblk;
6128 stp->sd_iocblk = NULL;
6129 if (bp != NULL) {
6130 if ((bp->b_datap->db_type == M_COPYIN) ||
6131 (bp->b_datap->db_type == M_COPYOUT)) {
6132 mutex_exit(&stp->sd_lock);
6133 if (bp->b_cont) {
6134 freemsg(bp->b_cont);
6135 bp->b_cont = NULL;
6136 }
6137 bp->b_datap->db_type = M_IOCDATA;
6138 bp->b_wptr = bp->b_rptr +
6139 sizeof (struct copyresp);
6140 resp = (struct copyresp *)bp->b_rptr;
6141 resp->cp_rval =
6142 (caddr_t)1; /* failure */
6143 stream_willservice(stp);
6144 putnext(stp->sd_wrq, bp);
6145 stream_runservice(stp);
6146 mutex_enter(&stp->sd_lock);
6147 } else {
6148 freemsg(bp);
6149 }
6150 }
6151 stp->sd_flag &= ~waitflags;
6152 cv_broadcast(&stp->sd_iocmonitor);
6153 mutex_exit(&stp->sd_lock);
6154 crfree(crp);
6155 return (error);
6156 }
6157 }
6158 bp = stp->sd_iocblk;
6159 /*
6160 * Note: it is strictly impossible to get here with sd_iocblk set to
6161 * -1. This is because the initial loop above doesn't allow any new
6162 * ioctls into the fray until all others have passed this point.
6163 */
6164 ASSERT(bp != NULL && bp != (mblk_t *)-1);
6165 TRACE_1(TR_FAC_STREAMS_FR,
6166 TR_STRDOIOCTL_ACK, "strdoioctl got reply: bp %p", bp);
6167 if ((bp->b_datap->db_type == M_IOCACK) ||
6168 (bp->b_datap->db_type == M_IOCNAK)) {
6169 /* for detection of duplicate ioctl replies */
6170 stp->sd_iocblk = (mblk_t *)-1;
6171 stp->sd_flag &= ~waitflags;
6172 cv_broadcast(&stp->sd_iocmonitor);
6173 mutex_exit(&stp->sd_lock);
6174 } else {
6175 /*
6176 * flags not cleared here because we're still doing
6177 * copy in/out for ioctl.
6178 */
6179 stp->sd_iocblk = NULL;
6180 mutex_exit(&stp->sd_lock);
6181 }
6182
6183
6184 /*
6185 * Have received acknowledgment.
6186 */
6187
6188 switch (bp->b_datap->db_type) {
6189 case M_IOCACK:
6190 /*
6191 * Positive ack.
6192 */
6193 iocbp = (struct iocblk *)bp->b_rptr;
6194
6195 /*
6196 * Set error if indicated.
6197 */
6198 if (iocbp->ioc_error) {
6199 error = iocbp->ioc_error;
6200 break;
6201 }
6202
6203 /*
6204 * Set return value.
6205 */
6206 *rvalp = iocbp->ioc_rval;
6207
6208 /*
6209 * Data may have been returned in ACK message (ioc_count > 0).
6210 * If so, copy it out to the user's buffer.
6211 */
6212 if (iocbp->ioc_count && !transparent) {
6213 if (error = getiocd(bp, strioc->ic_dp, copyflag))
6214 break;
6215 }
6216 if (!transparent) {
6217 if (len) /* an M_COPYOUT was used with I_STR */
6218 strioc->ic_len = len;
6219 else
6220 strioc->ic_len = (int)iocbp->ioc_count;
6221 }
6222 break;
6223
6224 case M_IOCNAK:
6225 /*
6226 * Negative ack.
6227 *
6228 * The only thing to do is set error as specified
6229 * in neg ack packet.
6230 */
6231 iocbp = (struct iocblk *)bp->b_rptr;
6232
6233 error = (iocbp->ioc_error ? iocbp->ioc_error : EINVAL);
6234 break;
6235
6236 case M_COPYIN:
6237 /*
6238 * Driver or module has requested user ioctl data.
6239 */
6240 reqp = (struct copyreq *)bp->b_rptr;
6241
6242 /*
6243 * M_COPYIN should *never* have a message attached, though
6244 * it's harmless if it does -- thus, panic on a DEBUG
6245 * kernel and just free it on a non-DEBUG build.
6246 */
6247 ASSERT(bp->b_cont == NULL);
6248 if (bp->b_cont != NULL) {
6249 freemsg(bp->b_cont);
6250 bp->b_cont = NULL;
6251 }
6252
6253 error = putiocd(bp, reqp->cq_addr, flag, crp);
6254 if (error && bp->b_cont) {
6255 freemsg(bp->b_cont);
6256 bp->b_cont = NULL;
6257 }
6258
6259 bp->b_wptr = bp->b_rptr + sizeof (struct copyresp);
6260 bp->b_datap->db_type = M_IOCDATA;
6261
6262 mblk_setcred(bp, crp, curproc->p_pid);
6263 resp = (struct copyresp *)bp->b_rptr;
6264 resp->cp_rval = (caddr_t)(uintptr_t)error;
6265 resp->cp_flag = (fflags & FMODELS);
6266
6267 stream_willservice(stp);
6268 putnext(stp->sd_wrq, bp);
6269 stream_runservice(stp);
6270
6271 if (error) {
6272 mutex_enter(&stp->sd_lock);
6273 stp->sd_flag &= ~waitflags;
6274 cv_broadcast(&stp->sd_iocmonitor);
6275 mutex_exit(&stp->sd_lock);
6276 crfree(crp);
6277 return (error);
6278 }
6279
6280 goto waitioc;
6281
6282 case M_COPYOUT:
6283 /*
6284 * Driver or module has ioctl data for a user.
6285 */
6286 reqp = (struct copyreq *)bp->b_rptr;
6287 ASSERT(bp->b_cont != NULL);
6288
6289 /*
6290 * Always (transparent or non-transparent )
6291 * use the address specified in the request
6292 */
6293 taddr = reqp->cq_addr;
6294 if (!transparent)
6295 len = (int)reqp->cq_size;
6296
6297 /* copyout data to the provided address */
6298 error = getiocd(bp, taddr, copyflag);
6299
6300 freemsg(bp->b_cont);
6301 bp->b_cont = NULL;
6302
6303 bp->b_wptr = bp->b_rptr + sizeof (struct copyresp);
6304 bp->b_datap->db_type = M_IOCDATA;
6305
6306 mblk_setcred(bp, crp, curproc->p_pid);
6307 resp = (struct copyresp *)bp->b_rptr;
6308 resp->cp_rval = (caddr_t)(uintptr_t)error;
6309 resp->cp_flag = (fflags & FMODELS);
6310
6311 stream_willservice(stp);
6312 putnext(stp->sd_wrq, bp);
6313 stream_runservice(stp);
6314
6315 if (error) {
6316 mutex_enter(&stp->sd_lock);
6317 stp->sd_flag &= ~waitflags;
6318 cv_broadcast(&stp->sd_iocmonitor);
6319 mutex_exit(&stp->sd_lock);
6320 crfree(crp);
6321 return (error);
6322 }
6323 goto waitioc;
6324
6325 default:
6326 ASSERT(0);
6327 mutex_enter(&stp->sd_lock);
6328 stp->sd_flag &= ~waitflags;
6329 cv_broadcast(&stp->sd_iocmonitor);
6330 mutex_exit(&stp->sd_lock);
6331 break;
6332 }
6333
6334 freemsg(bp);
6335 crfree(crp);
6336 return (error);
6337 }
6338
6339 /*
6340 * Send an M_CMD message downstream and wait for a reply. This is a ptools
6341 * special used to retrieve information from modules/drivers a stream without
6342 * being subjected to flow control or interfering with pending messages on the
6343 * stream (e.g. an ioctl in flight).
6344 */
6345 int
6346 strdocmd(struct stdata *stp, struct strcmd *scp, cred_t *crp)
6347 {
6348 mblk_t *mp;
6349 struct cmdblk *cmdp;
6350 int error = 0;
6351 int errs = STRHUP|STRDERR|STWRERR|STPLEX;
6352 clock_t rval, timeout = STRTIMOUT;
6353
6354 if (scp->sc_len < 0 || scp->sc_len > sizeof (scp->sc_buf) ||
6355 scp->sc_timeout < -1)
6356 return (EINVAL);
6357
6358 if (scp->sc_timeout > 0)
6359 timeout = scp->sc_timeout * MILLISEC;
6360
6361 if ((mp = allocb_cred(sizeof (struct cmdblk), crp,
6362 curproc->p_pid)) == NULL)
6363 return (ENOMEM);
6364
6365 crhold(crp);
6366
6367 cmdp = (struct cmdblk *)mp->b_wptr;
6368 cmdp->cb_cr = crp;
6369 cmdp->cb_cmd = scp->sc_cmd;
6370 cmdp->cb_len = scp->sc_len;
6371 cmdp->cb_error = 0;
6372 mp->b_wptr += sizeof (struct cmdblk);
6373
6374 DB_TYPE(mp) = M_CMD;
6375 DB_CPID(mp) = curproc->p_pid;
6376
6377 /*
6378 * Copy in the payload.
6379 */
6380 if (cmdp->cb_len > 0) {
6381 mp->b_cont = allocb_cred(sizeof (scp->sc_buf), crp,
6382 curproc->p_pid);
6383 if (mp->b_cont == NULL) {
6384 error = ENOMEM;
6385 goto out;
6386 }
6387
6388 /* cb_len comes from sc_len, which has already been checked */
6389 ASSERT(cmdp->cb_len <= sizeof (scp->sc_buf));
6390 (void) bcopy(scp->sc_buf, mp->b_cont->b_wptr, cmdp->cb_len);
6391 mp->b_cont->b_wptr += cmdp->cb_len;
6392 DB_CPID(mp->b_cont) = curproc->p_pid;
6393 }
6394
6395 /*
6396 * Since this mechanism is strictly for ptools, and since only one
6397 * process can be grabbed at a time, we simply fail if there's
6398 * currently an operation pending.
6399 */
6400 mutex_enter(&stp->sd_lock);
6401 if (stp->sd_flag & STRCMDWAIT) {
6402 mutex_exit(&stp->sd_lock);
6403 error = EBUSY;
6404 goto out;
6405 }
6406 stp->sd_flag |= STRCMDWAIT;
6407 ASSERT(stp->sd_cmdblk == NULL);
6408 mutex_exit(&stp->sd_lock);
6409
6410 putnext(stp->sd_wrq, mp);
6411 mp = NULL;
6412
6413 /*
6414 * Timed wait for acknowledgment. If the reply has already arrived,
6415 * don't sleep. If awakened from the sleep, fail only if the reply
6416 * has not arrived by then. Otherwise, process the reply.
6417 */
6418 mutex_enter(&stp->sd_lock);
6419 while (stp->sd_cmdblk == NULL) {
6420 if (stp->sd_flag & errs) {
6421 if ((error = strgeterr(stp, errs, 0)) != 0)
6422 goto waitout;
6423 }
6424
6425 rval = str_cv_wait(&stp->sd_monitor, &stp->sd_lock, timeout, 0);
6426 if (stp->sd_cmdblk != NULL)
6427 break;
6428
6429 if (rval <= 0) {
6430 error = (rval == 0) ? EINTR : ETIME;
6431 goto waitout;
6432 }
6433 }
6434
6435 /*
6436 * We received a reply.
6437 */
6438 mp = stp->sd_cmdblk;
6439 stp->sd_cmdblk = NULL;
6440 ASSERT(mp != NULL && DB_TYPE(mp) == M_CMD);
6441 ASSERT(stp->sd_flag & STRCMDWAIT);
6442 stp->sd_flag &= ~STRCMDWAIT;
6443 mutex_exit(&stp->sd_lock);
6444
6445 cmdp = (struct cmdblk *)mp->b_rptr;
6446 if ((error = cmdp->cb_error) != 0)
6447 goto out;
6448
6449 /*
6450 * Data may have been returned in the reply (cb_len > 0).
6451 * If so, copy it out to the user's buffer.
6452 */
6453 if (cmdp->cb_len > 0) {
6454 if (mp->b_cont == NULL || MBLKL(mp->b_cont) < cmdp->cb_len) {
6455 error = EPROTO;
6456 goto out;
6457 }
6458
6459 cmdp->cb_len = MIN(cmdp->cb_len, sizeof (scp->sc_buf));
6460 (void) bcopy(mp->b_cont->b_rptr, scp->sc_buf, cmdp->cb_len);
6461 }
6462 scp->sc_len = cmdp->cb_len;
6463 out:
6464 freemsg(mp);
6465 crfree(crp);
6466 return (error);
6467 waitout:
6468 ASSERT(stp->sd_cmdblk == NULL);
6469 stp->sd_flag &= ~STRCMDWAIT;
6470 mutex_exit(&stp->sd_lock);
6471 crfree(crp);
6472 return (error);
6473 }
6474
6475 /*
6476 * For the SunOS keyboard driver.
6477 * Return the next available "ioctl" sequence number.
6478 * Exported, so that streams modules can send "ioctl" messages
6479 * downstream from their open routine.
6480 */
6481 int
6482 getiocseqno(void)
6483 {
6484 int i;
6485
6486 mutex_enter(&strresources);
6487 i = ++ioc_id;
6488 mutex_exit(&strresources);
6489 return (i);
6490 }
6491
6492 /*
6493 * Get the next message from the read queue. If the message is
6494 * priority, STRPRI will have been set by strrput(). This flag
6495 * should be reset only when the entire message at the front of the
6496 * queue as been consumed.
6497 *
6498 * NOTE: strgetmsg and kstrgetmsg have much of the logic in common.
6499 */
6500 int
6501 strgetmsg(
6502 struct vnode *vp,
6503 struct strbuf *mctl,
6504 struct strbuf *mdata,
6505 unsigned char *prip,
6506 int *flagsp,
6507 int fmode,
6508 rval_t *rvp)
6509 {
6510 struct stdata *stp;
6511 mblk_t *bp, *nbp;
6512 mblk_t *savemp = NULL;
6513 mblk_t *savemptail = NULL;
6514 uint_t old_sd_flag;
6515 int flg;
6516 int more = 0;
6517 int error = 0;
6518 char first = 1;
6519 uint_t mark; /* Contains MSG*MARK and _LASTMARK */
6520 #define _LASTMARK 0x8000 /* Distinct from MSG*MARK */
6521 unsigned char pri = 0;
6522 queue_t *q;
6523 int pr = 0; /* Partial read successful */
6524 struct uio uios;
6525 struct uio *uiop = &uios;
6526 struct iovec iovs;
6527 unsigned char type;
6528
6529 TRACE_1(TR_FAC_STREAMS_FR, TR_STRGETMSG_ENTER,
6530 "strgetmsg:%p", vp);
6531
6532 ASSERT(vp->v_stream);
6533 stp = vp->v_stream;
6534 rvp->r_val1 = 0;
6535
6536 mutex_enter(&stp->sd_lock);
6537
6538 if ((error = i_straccess(stp, JCREAD)) != 0) {
6539 mutex_exit(&stp->sd_lock);
6540 return (error);
6541 }
6542
6543 if (stp->sd_flag & (STRDERR|STPLEX)) {
6544 error = strgeterr(stp, STRDERR|STPLEX, 0);
6545 if (error != 0) {
6546 mutex_exit(&stp->sd_lock);
6547 return (error);
6548 }
6549 }
6550 mutex_exit(&stp->sd_lock);
6551
6552 switch (*flagsp) {
6553 case MSG_HIPRI:
6554 if (*prip != 0)
6555 return (EINVAL);
6556 break;
6557
6558 case MSG_ANY:
6559 case MSG_BAND:
6560 break;
6561
6562 default:
6563 return (EINVAL);
6564 }
6565 /*
6566 * Setup uio and iov for data part
6567 */
6568 iovs.iov_base = mdata->buf;
6569 iovs.iov_len = mdata->maxlen;
6570 uios.uio_iov = &iovs;
6571 uios.uio_iovcnt = 1;
6572 uios.uio_loffset = 0;
6573 uios.uio_segflg = UIO_USERSPACE;
6574 uios.uio_fmode = 0;
6575 uios.uio_extflg = UIO_COPY_CACHED;
6576 uios.uio_resid = mdata->maxlen;
6577 uios.uio_offset = 0;
6578
6579 q = _RD(stp->sd_wrq);
6580 mutex_enter(&stp->sd_lock);
6581 old_sd_flag = stp->sd_flag;
6582 mark = 0;
6583 for (;;) {
6584 int done = 0;
6585 mblk_t *q_first = q->q_first;
6586
6587 /*
6588 * Get the next message of appropriate priority
6589 * from the stream head. If the caller is interested
6590 * in band or hipri messages, then they should already
6591 * be enqueued at the stream head. On the other hand
6592 * if the caller wants normal (band 0) messages, they
6593 * might be deferred in a synchronous stream and they
6594 * will need to be pulled up.
6595 *
6596 * After we have dequeued a message, we might find that
6597 * it was a deferred M_SIG that was enqueued at the
6598 * stream head. It must now be posted as part of the
6599 * read by calling strsignal_nolock().
6600 *
6601 * Also note that strrput does not enqueue an M_PCSIG,
6602 * and there cannot be more than one hipri message,
6603 * so there was no need to have the M_PCSIG case.
6604 *
6605 * At some time it might be nice to try and wrap the
6606 * functionality of kstrgetmsg() and strgetmsg() into
6607 * a common routine so to reduce the amount of replicated
6608 * code (since they are extremely similar).
6609 */
6610 if (!(*flagsp & (MSG_HIPRI|MSG_BAND))) {
6611 /* Asking for normal, band0 data */
6612 bp = strget(stp, q, uiop, first, &error);
6613 ASSERT(MUTEX_HELD(&stp->sd_lock));
6614 if (bp != NULL) {
6615 if (DB_TYPE(bp) == M_SIG) {
6616 strsignal_nolock(stp, *bp->b_rptr,
6617 bp->b_band);
6618 freemsg(bp);
6619 continue;
6620 } else {
6621 break;
6622 }
6623 }
6624 if (error != 0)
6625 goto getmout;
6626
6627 /*
6628 * We can't depend on the value of STRPRI here because
6629 * the stream head may be in transit. Therefore, we
6630 * must look at the type of the first message to
6631 * determine if a high priority messages is waiting
6632 */
6633 } else if ((*flagsp & MSG_HIPRI) && q_first != NULL &&
6634 DB_TYPE(q_first) >= QPCTL &&
6635 (bp = getq_noenab(q, 0)) != NULL) {
6636 /* Asked for HIPRI and got one */
6637 ASSERT(DB_TYPE(bp) >= QPCTL);
6638 break;
6639 } else if ((*flagsp & MSG_BAND) && q_first != NULL &&
6640 ((q_first->b_band >= *prip) || DB_TYPE(q_first) >= QPCTL) &&
6641 (bp = getq_noenab(q, 0)) != NULL) {
6642 /*
6643 * Asked for at least band "prip" and got either at
6644 * least that band or a hipri message.
6645 */
6646 ASSERT(bp->b_band >= *prip || DB_TYPE(bp) >= QPCTL);
6647 if (DB_TYPE(bp) == M_SIG) {
6648 strsignal_nolock(stp, *bp->b_rptr, bp->b_band);
6649 freemsg(bp);
6650 continue;
6651 } else {
6652 break;
6653 }
6654 }
6655
6656 /* No data. Time to sleep? */
6657 qbackenable(q, 0);
6658
6659 /*
6660 * If STRHUP or STREOF, return 0 length control and data.
6661 * If resid is 0, then a read(fd,buf,0) was done. Do not
6662 * sleep to satisfy this request because by default we have
6663 * zero bytes to return.
6664 */
6665 if ((stp->sd_flag & (STRHUP|STREOF)) || (mctl->maxlen == 0 &&
6666 mdata->maxlen == 0)) {
6667 mctl->len = mdata->len = 0;
6668 *flagsp = 0;
6669 mutex_exit(&stp->sd_lock);
6670 return (0);
6671 }
6672 TRACE_2(TR_FAC_STREAMS_FR, TR_STRGETMSG_WAIT,
6673 "strgetmsg calls strwaitq:%p, %p",
6674 vp, uiop);
6675 if (((error = strwaitq(stp, GETWAIT, (ssize_t)0, fmode, -1,
6676 &done)) != 0) || done) {
6677 TRACE_2(TR_FAC_STREAMS_FR, TR_STRGETMSG_DONE,
6678 "strgetmsg error or done:%p, %p",
6679 vp, uiop);
6680 mutex_exit(&stp->sd_lock);
6681 return (error);
6682 }
6683 TRACE_2(TR_FAC_STREAMS_FR, TR_STRGETMSG_AWAKE,
6684 "strgetmsg awakes:%p, %p", vp, uiop);
6685 if ((error = i_straccess(stp, JCREAD)) != 0) {
6686 mutex_exit(&stp->sd_lock);
6687 return (error);
6688 }
6689 first = 0;
6690 }
6691 ASSERT(bp != NULL);
6692 /*
6693 * Extract any mark information. If the message is not completely
6694 * consumed this information will be put in the mblk
6695 * that is putback.
6696 * If MSGMARKNEXT is set and the message is completely consumed
6697 * the STRATMARK flag will be set below. Likewise, if
6698 * MSGNOTMARKNEXT is set and the message is
6699 * completely consumed STRNOTATMARK will be set.
6700 */
6701 mark = bp->b_flag & (MSGMARK | MSGMARKNEXT | MSGNOTMARKNEXT);
6702 ASSERT((mark & (MSGMARKNEXT|MSGNOTMARKNEXT)) !=
6703 (MSGMARKNEXT|MSGNOTMARKNEXT));
6704 if (mark != 0 && bp == stp->sd_mark) {
6705 mark |= _LASTMARK;
6706 stp->sd_mark = NULL;
6707 }
6708 /*
6709 * keep track of the original message type and priority
6710 */
6711 pri = bp->b_band;
6712 type = bp->b_datap->db_type;
6713 if (type == M_PASSFP) {
6714 if ((mark & _LASTMARK) && (stp->sd_mark == NULL))
6715 stp->sd_mark = bp;
6716 bp->b_flag |= mark & ~_LASTMARK;
6717 putback(stp, q, bp, pri);
6718 qbackenable(q, pri);
6719 mutex_exit(&stp->sd_lock);
6720 return (EBADMSG);
6721 }
6722 ASSERT(type != M_SIG);
6723
6724 /*
6725 * Set this flag so strrput will not generate signals. Need to
6726 * make sure this flag is cleared before leaving this routine
6727 * else signals will stop being sent.
6728 */
6729 stp->sd_flag |= STRGETINPROG;
6730 mutex_exit(&stp->sd_lock);
6731
6732 if (STREAM_NEEDSERVICE(stp))
6733 stream_runservice(stp);
6734
6735 /*
6736 * Set HIPRI flag if message is priority.
6737 */
6738 if (type >= QPCTL)
6739 flg = MSG_HIPRI;
6740 else
6741 flg = MSG_BAND;
6742
6743 /*
6744 * First process PROTO or PCPROTO blocks, if any.
6745 */
6746 if (mctl->maxlen >= 0 && type != M_DATA) {
6747 size_t n, bcnt;
6748 char *ubuf;
6749
6750 bcnt = mctl->maxlen;
6751 ubuf = mctl->buf;
6752 while (bp != NULL && bp->b_datap->db_type != M_DATA) {
6753 if ((n = MIN(bcnt, bp->b_wptr - bp->b_rptr)) != 0 &&
6754 copyout(bp->b_rptr, ubuf, n)) {
6755 error = EFAULT;
6756 mutex_enter(&stp->sd_lock);
6757 /*
6758 * clear stream head pri flag based on
6759 * first message type
6760 */
6761 if (type >= QPCTL) {
6762 ASSERT(type == M_PCPROTO);
6763 stp->sd_flag &= ~STRPRI;
6764 }
6765 more = 0;
6766 freemsg(bp);
6767 goto getmout;
6768 }
6769 ubuf += n;
6770 bp->b_rptr += n;
6771 if (bp->b_rptr >= bp->b_wptr) {
6772 nbp = bp;
6773 bp = bp->b_cont;
6774 freeb(nbp);
6775 }
6776 ASSERT(n <= bcnt);
6777 bcnt -= n;
6778 if (bcnt == 0)
6779 break;
6780 }
6781 mctl->len = mctl->maxlen - bcnt;
6782 } else
6783 mctl->len = -1;
6784
6785 if (bp && bp->b_datap->db_type != M_DATA) {
6786 /*
6787 * More PROTO blocks in msg.
6788 */
6789 more |= MORECTL;
6790 savemp = bp;
6791 while (bp && bp->b_datap->db_type != M_DATA) {
6792 savemptail = bp;
6793 bp = bp->b_cont;
6794 }
6795 savemptail->b_cont = NULL;
6796 }
6797
6798 /*
6799 * Now process DATA blocks, if any.
6800 */
6801 if (mdata->maxlen >= 0 && bp) {
6802 /*
6803 * struiocopyout will consume a potential zero-length
6804 * M_DATA even if uio_resid is zero.
6805 */
6806 size_t oldresid = uiop->uio_resid;
6807
6808 bp = struiocopyout(bp, uiop, &error);
6809 if (error != 0) {
6810 mutex_enter(&stp->sd_lock);
6811 /*
6812 * clear stream head hi pri flag based on
6813 * first message
6814 */
6815 if (type >= QPCTL) {
6816 ASSERT(type == M_PCPROTO);
6817 stp->sd_flag &= ~STRPRI;
6818 }
6819 more = 0;
6820 freemsg(savemp);
6821 goto getmout;
6822 }
6823 /*
6824 * (pr == 1) indicates a partial read.
6825 */
6826 if (oldresid > uiop->uio_resid)
6827 pr = 1;
6828 mdata->len = mdata->maxlen - uiop->uio_resid;
6829 } else
6830 mdata->len = -1;
6831
6832 if (bp) { /* more data blocks in msg */
6833 more |= MOREDATA;
6834 if (savemp)
6835 savemptail->b_cont = bp;
6836 else
6837 savemp = bp;
6838 }
6839
6840 mutex_enter(&stp->sd_lock);
6841 if (savemp) {
6842 if (pr && (savemp->b_datap->db_type == M_DATA) &&
6843 msgnodata(savemp)) {
6844 /*
6845 * Avoid queuing a zero-length tail part of
6846 * a message. pr=1 indicates that we read some of
6847 * the message.
6848 */
6849 freemsg(savemp);
6850 more &= ~MOREDATA;
6851 /*
6852 * clear stream head hi pri flag based on
6853 * first message
6854 */
6855 if (type >= QPCTL) {
6856 ASSERT(type == M_PCPROTO);
6857 stp->sd_flag &= ~STRPRI;
6858 }
6859 } else {
6860 savemp->b_band = pri;
6861 /*
6862 * If the first message was HIPRI and the one we're
6863 * putting back isn't, then clear STRPRI, otherwise
6864 * set STRPRI again. Note that we must set STRPRI
6865 * again since the flush logic in strrput_nondata()
6866 * may have cleared it while we had sd_lock dropped.
6867 */
6868 if (type >= QPCTL) {
6869 ASSERT(type == M_PCPROTO);
6870 if (queclass(savemp) < QPCTL)
6871 stp->sd_flag &= ~STRPRI;
6872 else
6873 stp->sd_flag |= STRPRI;
6874 } else if (queclass(savemp) >= QPCTL) {
6875 /*
6876 * The first message was not a HIPRI message,
6877 * but the one we are about to putback is.
6878 * For simplicitly, we do not allow for HIPRI
6879 * messages to be embedded in the message
6880 * body, so just force it to same type as
6881 * first message.
6882 */
6883 ASSERT(type == M_DATA || type == M_PROTO);
6884 ASSERT(savemp->b_datap->db_type == M_PCPROTO);
6885 savemp->b_datap->db_type = type;
6886 }
6887 if (mark != 0) {
6888 savemp->b_flag |= mark & ~_LASTMARK;
6889 if ((mark & _LASTMARK) &&
6890 (stp->sd_mark == NULL)) {
6891 /*
6892 * If another marked message arrived
6893 * while sd_lock was not held sd_mark
6894 * would be non-NULL.
6895 */
6896 stp->sd_mark = savemp;
6897 }
6898 }
6899 putback(stp, q, savemp, pri);
6900 }
6901 } else {
6902 /*
6903 * The complete message was consumed.
6904 *
6905 * If another M_PCPROTO arrived while sd_lock was not held
6906 * it would have been discarded since STRPRI was still set.
6907 *
6908 * Move the MSG*MARKNEXT information
6909 * to the stream head just in case
6910 * the read queue becomes empty.
6911 * clear stream head hi pri flag based on
6912 * first message
6913 *
6914 * If the stream head was at the mark
6915 * (STRATMARK) before we dropped sd_lock above
6916 * and some data was consumed then we have
6917 * moved past the mark thus STRATMARK is
6918 * cleared. However, if a message arrived in
6919 * strrput during the copyout above causing
6920 * STRATMARK to be set we can not clear that
6921 * flag.
6922 */
6923 if (type >= QPCTL) {
6924 ASSERT(type == M_PCPROTO);
6925 stp->sd_flag &= ~STRPRI;
6926 }
6927 if (mark & (MSGMARKNEXT|MSGNOTMARKNEXT|MSGMARK)) {
6928 if (mark & MSGMARKNEXT) {
6929 stp->sd_flag &= ~STRNOTATMARK;
6930 stp->sd_flag |= STRATMARK;
6931 } else if (mark & MSGNOTMARKNEXT) {
6932 stp->sd_flag &= ~STRATMARK;
6933 stp->sd_flag |= STRNOTATMARK;
6934 } else {
6935 stp->sd_flag &= ~(STRATMARK|STRNOTATMARK);
6936 }
6937 } else if (pr && (old_sd_flag & STRATMARK)) {
6938 stp->sd_flag &= ~STRATMARK;
6939 }
6940 }
6941
6942 *flagsp = flg;
6943 *prip = pri;
6944
6945 /*
6946 * Getmsg cleanup processing - if the state of the queue has changed
6947 * some signals may need to be sent and/or poll awakened.
6948 */
6949 getmout:
6950 qbackenable(q, pri);
6951
6952 /*
6953 * We dropped the stream head lock above. Send all M_SIG messages
6954 * before processing stream head for SIGPOLL messages.
6955 */
6956 ASSERT(MUTEX_HELD(&stp->sd_lock));
6957 while ((bp = q->q_first) != NULL &&
6958 (bp->b_datap->db_type == M_SIG)) {
6959 /*
6960 * sd_lock is held so the content of the read queue can not
6961 * change.
6962 */
6963 bp = getq(q);
6964 ASSERT(bp != NULL && bp->b_datap->db_type == M_SIG);
6965
6966 strsignal_nolock(stp, *bp->b_rptr, bp->b_band);
6967 mutex_exit(&stp->sd_lock);
6968 freemsg(bp);
6969 if (STREAM_NEEDSERVICE(stp))
6970 stream_runservice(stp);
6971 mutex_enter(&stp->sd_lock);
6972 }
6973
6974 /*
6975 * stream head cannot change while we make the determination
6976 * whether or not to send a signal. Drop the flag to allow strrput
6977 * to send firstmsgsigs again.
6978 */
6979 stp->sd_flag &= ~STRGETINPROG;
6980
6981 /*
6982 * If the type of message at the front of the queue changed
6983 * due to the receive the appropriate signals and pollwakeup events
6984 * are generated. The type of changes are:
6985 * Processed a hipri message, q_first is not hipri.
6986 * Processed a band X message, and q_first is band Y.
6987 * The generated signals and pollwakeups are identical to what
6988 * strrput() generates should the message that is now on q_first
6989 * arrive to an empty read queue.
6990 *
6991 * Note: only strrput will send a signal for a hipri message.
6992 */
6993 if ((bp = q->q_first) != NULL && !(stp->sd_flag & STRPRI)) {
6994 strsigset_t signals = 0;
6995 strpollset_t pollwakeups = 0;
6996
6997 if (flg & MSG_HIPRI) {
6998 /*
6999 * Removed a hipri message. Regular data at
7000 * the front of the queue.
7001 */
7002 if (bp->b_band == 0) {
7003 signals = S_INPUT | S_RDNORM;
7004 pollwakeups = POLLIN | POLLRDNORM;
7005 } else {
7006 signals = S_INPUT | S_RDBAND;
7007 pollwakeups = POLLIN | POLLRDBAND;
7008 }
7009 } else if (pri != bp->b_band) {
7010 /*
7011 * The band is different for the new q_first.
7012 */
7013 if (bp->b_band == 0) {
7014 signals = S_RDNORM;
7015 pollwakeups = POLLIN | POLLRDNORM;
7016 } else {
7017 signals = S_RDBAND;
7018 pollwakeups = POLLIN | POLLRDBAND;
7019 }
7020 }
7021
7022 if (pollwakeups != 0) {
7023 if (pollwakeups == (POLLIN | POLLRDNORM)) {
7024 if (!(stp->sd_rput_opt & SR_POLLIN))
7025 goto no_pollwake;
7026 stp->sd_rput_opt &= ~SR_POLLIN;
7027 }
7028 mutex_exit(&stp->sd_lock);
7029 pollwakeup(&stp->sd_pollist, pollwakeups);
7030 mutex_enter(&stp->sd_lock);
7031 }
7032 no_pollwake:
7033
7034 if (stp->sd_sigflags & signals)
7035 strsendsig(stp->sd_siglist, signals, bp->b_band, 0);
7036 }
7037 mutex_exit(&stp->sd_lock);
7038
7039 rvp->r_val1 = more;
7040 return (error);
7041 #undef _LASTMARK
7042 }
7043
7044 /*
7045 * Get the next message from the read queue. If the message is
7046 * priority, STRPRI will have been set by strrput(). This flag
7047 * should be reset only when the entire message at the front of the
7048 * queue as been consumed.
7049 *
7050 * If uiop is NULL all data is returned in mctlp.
7051 * Note that a NULL uiop implies that FNDELAY and FNONBLOCK are assumed
7052 * not enabled.
7053 * The timeout parameter is in milliseconds; -1 for infinity.
7054 * This routine handles the consolidation private flags:
7055 * MSG_IGNERROR Ignore any stream head error except STPLEX.
7056 * MSG_DELAYERROR Defer the error check until the queue is empty.
7057 * MSG_HOLDSIG Hold signals while waiting for data.
7058 * MSG_IPEEK Only peek at messages.
7059 * MSG_DISCARDTAIL Discard the tail M_DATA part of the message
7060 * that doesn't fit.
7061 * MSG_NOMARK If the message is marked leave it on the queue.
7062 *
7063 * NOTE: strgetmsg and kstrgetmsg have much of the logic in common.
7064 */
7065 int
7066 kstrgetmsg(
7067 struct vnode *vp,
7068 mblk_t **mctlp,
7069 struct uio *uiop,
7070 unsigned char *prip,
7071 int *flagsp,
7072 clock_t timout,
7073 rval_t *rvp)
7074 {
7075 struct stdata *stp;
7076 mblk_t *bp, *nbp;
7077 mblk_t *savemp = NULL;
7078 mblk_t *savemptail = NULL;
7079 int flags;
7080 uint_t old_sd_flag;
7081 int flg;
7082 int more = 0;
7083 int error = 0;
7084 char first = 1;
7085 uint_t mark; /* Contains MSG*MARK and _LASTMARK */
7086 #define _LASTMARK 0x8000 /* Distinct from MSG*MARK */
7087 unsigned char pri = 0;
7088 queue_t *q;
7089 int pr = 0; /* Partial read successful */
7090 unsigned char type;
7091
7092 TRACE_1(TR_FAC_STREAMS_FR, TR_KSTRGETMSG_ENTER,
7093 "kstrgetmsg:%p", vp);
7094
7095 ASSERT(vp->v_stream);
7096 stp = vp->v_stream;
7097 rvp->r_val1 = 0;
7098
7099 mutex_enter(&stp->sd_lock);
7100
7101 if ((error = i_straccess(stp, JCREAD)) != 0) {
7102 mutex_exit(&stp->sd_lock);
7103 return (error);
7104 }
7105
7106 flags = *flagsp;
7107 if (stp->sd_flag & (STRDERR|STPLEX)) {
7108 if ((stp->sd_flag & STPLEX) ||
7109 (flags & (MSG_IGNERROR|MSG_DELAYERROR)) == 0) {
7110 error = strgeterr(stp, STRDERR|STPLEX,
7111 (flags & MSG_IPEEK));
7112 if (error != 0) {
7113 mutex_exit(&stp->sd_lock);
7114 return (error);
7115 }
7116 }
7117 }
7118 mutex_exit(&stp->sd_lock);
7119
7120 switch (flags & (MSG_HIPRI|MSG_ANY|MSG_BAND)) {
7121 case MSG_HIPRI:
7122 if (*prip != 0)
7123 return (EINVAL);
7124 break;
7125
7126 case MSG_ANY:
7127 case MSG_BAND:
7128 break;
7129
7130 default:
7131 return (EINVAL);
7132 }
7133
7134 retry:
7135 q = _RD(stp->sd_wrq);
7136 mutex_enter(&stp->sd_lock);
7137 old_sd_flag = stp->sd_flag;
7138 mark = 0;
7139 for (;;) {
7140 int done = 0;
7141 int waitflag;
7142 int fmode;
7143 mblk_t *q_first = q->q_first;
7144
7145 /*
7146 * This section of the code operates just like the code
7147 * in strgetmsg(). There is a comment there about what
7148 * is going on here.
7149 */
7150 if (!(flags & (MSG_HIPRI|MSG_BAND))) {
7151 /* Asking for normal, band0 data */
7152 bp = strget(stp, q, uiop, first, &error);
7153 ASSERT(MUTEX_HELD(&stp->sd_lock));
7154 if (bp != NULL) {
7155 if (DB_TYPE(bp) == M_SIG) {
7156 strsignal_nolock(stp, *bp->b_rptr,
7157 bp->b_band);
7158 freemsg(bp);
7159 continue;
7160 } else {
7161 break;
7162 }
7163 }
7164 if (error != 0) {
7165 goto getmout;
7166 }
7167 /*
7168 * We can't depend on the value of STRPRI here because
7169 * the stream head may be in transit. Therefore, we
7170 * must look at the type of the first message to
7171 * determine if a high priority messages is waiting
7172 */
7173 } else if ((flags & MSG_HIPRI) && q_first != NULL &&
7174 DB_TYPE(q_first) >= QPCTL &&
7175 (bp = getq_noenab(q, 0)) != NULL) {
7176 ASSERT(DB_TYPE(bp) >= QPCTL);
7177 break;
7178 } else if ((flags & MSG_BAND) && q_first != NULL &&
7179 ((q_first->b_band >= *prip) || DB_TYPE(q_first) >= QPCTL) &&
7180 (bp = getq_noenab(q, 0)) != NULL) {
7181 /*
7182 * Asked for at least band "prip" and got either at
7183 * least that band or a hipri message.
7184 */
7185 ASSERT(bp->b_band >= *prip || DB_TYPE(bp) >= QPCTL);
7186 if (DB_TYPE(bp) == M_SIG) {
7187 strsignal_nolock(stp, *bp->b_rptr, bp->b_band);
7188 freemsg(bp);
7189 continue;
7190 } else {
7191 break;
7192 }
7193 }
7194
7195 /* No data. Time to sleep? */
7196 qbackenable(q, 0);
7197
7198 /*
7199 * Delayed error notification?
7200 */
7201 if ((stp->sd_flag & (STRDERR|STPLEX)) &&
7202 (flags & (MSG_IGNERROR|MSG_DELAYERROR)) == MSG_DELAYERROR) {
7203 error = strgeterr(stp, STRDERR|STPLEX,
7204 (flags & MSG_IPEEK));
7205 if (error != 0) {
7206 mutex_exit(&stp->sd_lock);
7207 return (error);
7208 }
7209 }
7210
7211 /*
7212 * If STRHUP or STREOF, return 0 length control and data.
7213 * If a read(fd,buf,0) has been done, do not sleep, just
7214 * return.
7215 *
7216 * If mctlp == NULL and uiop == NULL, then the code will
7217 * do the strwaitq. This is an understood way of saying
7218 * sleep "polling" until a message is received.
7219 */
7220 if ((stp->sd_flag & (STRHUP|STREOF)) ||
7221 (uiop != NULL && uiop->uio_resid == 0)) {
7222 if (mctlp != NULL)
7223 *mctlp = NULL;
7224 *flagsp = 0;
7225 mutex_exit(&stp->sd_lock);
7226 return (0);
7227 }
7228
7229 waitflag = GETWAIT;
7230 if (flags &
7231 (MSG_HOLDSIG|MSG_IGNERROR|MSG_IPEEK|MSG_DELAYERROR)) {
7232 if (flags & MSG_HOLDSIG)
7233 waitflag |= STR_NOSIG;
7234 if (flags & MSG_IGNERROR)
7235 waitflag |= STR_NOERROR;
7236 if (flags & MSG_IPEEK)
7237 waitflag |= STR_PEEK;
7238 if (flags & MSG_DELAYERROR)
7239 waitflag |= STR_DELAYERR;
7240 }
7241 if (uiop != NULL)
7242 fmode = uiop->uio_fmode;
7243 else
7244 fmode = 0;
7245
7246 TRACE_2(TR_FAC_STREAMS_FR, TR_KSTRGETMSG_WAIT,
7247 "kstrgetmsg calls strwaitq:%p, %p",
7248 vp, uiop);
7249 if (((error = strwaitq(stp, waitflag, (ssize_t)0,
7250 fmode, timout, &done))) != 0 || done) {
7251 TRACE_2(TR_FAC_STREAMS_FR, TR_KSTRGETMSG_DONE,
7252 "kstrgetmsg error or done:%p, %p",
7253 vp, uiop);
7254 mutex_exit(&stp->sd_lock);
7255 return (error);
7256 }
7257 TRACE_2(TR_FAC_STREAMS_FR, TR_KSTRGETMSG_AWAKE,
7258 "kstrgetmsg awakes:%p, %p", vp, uiop);
7259 if ((error = i_straccess(stp, JCREAD)) != 0) {
7260 mutex_exit(&stp->sd_lock);
7261 return (error);
7262 }
7263 first = 0;
7264 }
7265 ASSERT(bp != NULL);
7266 /*
7267 * Extract any mark information. If the message is not completely
7268 * consumed this information will be put in the mblk
7269 * that is putback.
7270 * If MSGMARKNEXT is set and the message is completely consumed
7271 * the STRATMARK flag will be set below. Likewise, if
7272 * MSGNOTMARKNEXT is set and the message is
7273 * completely consumed STRNOTATMARK will be set.
7274 */
7275 mark = bp->b_flag & (MSGMARK | MSGMARKNEXT | MSGNOTMARKNEXT);
7276 ASSERT((mark & (MSGMARKNEXT|MSGNOTMARKNEXT)) !=
7277 (MSGMARKNEXT|MSGNOTMARKNEXT));
7278 pri = bp->b_band;
7279 if (mark != 0) {
7280 /*
7281 * If the caller doesn't want the mark return.
7282 * Used to implement MSG_WAITALL in sockets.
7283 */
7284 if (flags & MSG_NOMARK) {
7285 putback(stp, q, bp, pri);
7286 qbackenable(q, pri);
7287 mutex_exit(&stp->sd_lock);
7288 return (EWOULDBLOCK);
7289 }
7290 if (bp == stp->sd_mark) {
7291 mark |= _LASTMARK;
7292 stp->sd_mark = NULL;
7293 }
7294 }
7295
7296 /*
7297 * keep track of the first message type
7298 */
7299 type = bp->b_datap->db_type;
7300
7301 if (bp->b_datap->db_type == M_PASSFP) {
7302 if ((mark & _LASTMARK) && (stp->sd_mark == NULL))
7303 stp->sd_mark = bp;
7304 bp->b_flag |= mark & ~_LASTMARK;
7305 putback(stp, q, bp, pri);
7306 qbackenable(q, pri);
7307 mutex_exit(&stp->sd_lock);
7308 return (EBADMSG);
7309 }
7310 ASSERT(type != M_SIG);
7311
7312 if (flags & MSG_IPEEK) {
7313 /*
7314 * Clear any struioflag - we do the uiomove over again
7315 * when peeking since it simplifies the code.
7316 *
7317 * Dup the message and put the original back on the queue.
7318 * If dupmsg() fails, try again with copymsg() to see if
7319 * there is indeed a shortage of memory. dupmsg() may fail
7320 * if db_ref in any of the messages reaches its limit.
7321 */
7322
7323 if ((nbp = dupmsg(bp)) == NULL && (nbp = copymsg(bp)) == NULL) {
7324 /*
7325 * Restore the state of the stream head since we
7326 * need to drop sd_lock (strwaitbuf is sleeping).
7327 */
7328 size_t size = msgdsize(bp);
7329
7330 if ((mark & _LASTMARK) && (stp->sd_mark == NULL))
7331 stp->sd_mark = bp;
7332 bp->b_flag |= mark & ~_LASTMARK;
7333 putback(stp, q, bp, pri);
7334 mutex_exit(&stp->sd_lock);
7335 error = strwaitbuf(size, BPRI_HI);
7336 if (error) {
7337 /*
7338 * There is no net change to the queue thus
7339 * no need to qbackenable.
7340 */
7341 return (error);
7342 }
7343 goto retry;
7344 }
7345
7346 if ((mark & _LASTMARK) && (stp->sd_mark == NULL))
7347 stp->sd_mark = bp;
7348 bp->b_flag |= mark & ~_LASTMARK;
7349 putback(stp, q, bp, pri);
7350 bp = nbp;
7351 }
7352
7353 /*
7354 * Set this flag so strrput will not generate signals. Need to
7355 * make sure this flag is cleared before leaving this routine
7356 * else signals will stop being sent.
7357 */
7358 stp->sd_flag |= STRGETINPROG;
7359 mutex_exit(&stp->sd_lock);
7360
7361 if ((stp->sd_rputdatafunc != NULL) && (DB_TYPE(bp) == M_DATA)) {
7362 mblk_t *tmp, *prevmp;
7363
7364 /*
7365 * Put first non-data mblk back to stream head and
7366 * cut the mblk chain so sd_rputdatafunc only sees
7367 * M_DATA mblks. We can skip the first mblk since it
7368 * is M_DATA according to the condition above.
7369 */
7370 for (prevmp = bp, tmp = bp->b_cont; tmp != NULL;
7371 prevmp = tmp, tmp = tmp->b_cont) {
7372 if (DB_TYPE(tmp) != M_DATA) {
7373 prevmp->b_cont = NULL;
7374 mutex_enter(&stp->sd_lock);
7375 putback(stp, q, tmp, tmp->b_band);
7376 mutex_exit(&stp->sd_lock);
7377 break;
7378 }
7379 }
7380
7381 bp = (stp->sd_rputdatafunc)(stp->sd_vnode, bp,
7382 NULL, NULL, NULL, NULL);
7383
7384 if (bp == NULL)
7385 goto retry;
7386 }
7387
7388 if (STREAM_NEEDSERVICE(stp))
7389 stream_runservice(stp);
7390
7391 /*
7392 * Set HIPRI flag if message is priority.
7393 */
7394 if (type >= QPCTL)
7395 flg = MSG_HIPRI;
7396 else
7397 flg = MSG_BAND;
7398
7399 /*
7400 * First process PROTO or PCPROTO blocks, if any.
7401 */
7402 if (mctlp != NULL && type != M_DATA) {
7403 mblk_t *nbp;
7404
7405 *mctlp = bp;
7406 while (bp->b_cont && bp->b_cont->b_datap->db_type != M_DATA)
7407 bp = bp->b_cont;
7408 nbp = bp->b_cont;
7409 bp->b_cont = NULL;
7410 bp = nbp;
7411 }
7412
7413 if (bp && bp->b_datap->db_type != M_DATA) {
7414 /*
7415 * More PROTO blocks in msg. Will only happen if mctlp is NULL.
7416 */
7417 more |= MORECTL;
7418 savemp = bp;
7419 while (bp && bp->b_datap->db_type != M_DATA) {
7420 savemptail = bp;
7421 bp = bp->b_cont;
7422 }
7423 savemptail->b_cont = NULL;
7424 }
7425
7426 /*
7427 * Now process DATA blocks, if any.
7428 */
7429 if (uiop == NULL) {
7430 /* Append data to tail of mctlp */
7431
7432 if (mctlp != NULL) {
7433 mblk_t **mpp = mctlp;
7434
7435 while (*mpp != NULL)
7436 mpp = &((*mpp)->b_cont);
7437 *mpp = bp;
7438 bp = NULL;
7439 }
7440 } else if (uiop->uio_resid >= 0 && bp) {
7441 size_t oldresid = uiop->uio_resid;
7442
7443 /*
7444 * If a streams message is likely to consist
7445 * of many small mblks, it is pulled up into
7446 * one continuous chunk of memory.
7447 * The size of the first mblk may be bogus because
7448 * successive read() calls on the socket reduce
7449 * the size of this mblk until it is exhausted
7450 * and then the code walks on to the next. Thus
7451 * the size of the mblk may not be the original size
7452 * that was passed up, it's simply a remainder
7453 * and hence can be very small without any
7454 * implication that the packet is badly fragmented.
7455 * So the size of the possible second mblk is
7456 * used to spot a badly fragmented packet.
7457 * see longer comment at top of page
7458 * by mblk_pull_len declaration.
7459 */
7460
7461 if (bp->b_cont != NULL && MBLKL(bp->b_cont) < mblk_pull_len) {
7462 (void) pullupmsg(bp, -1);
7463 }
7464
7465 bp = struiocopyout(bp, uiop, &error);
7466 if (error != 0) {
7467 if (mctlp != NULL) {
7468 freemsg(*mctlp);
7469 *mctlp = NULL;
7470 } else
7471 freemsg(savemp);
7472 mutex_enter(&stp->sd_lock);
7473 /*
7474 * clear stream head hi pri flag based on
7475 * first message
7476 */
7477 if (!(flags & MSG_IPEEK) && (type >= QPCTL)) {
7478 ASSERT(type == M_PCPROTO);
7479 stp->sd_flag &= ~STRPRI;
7480 }
7481 more = 0;
7482 goto getmout;
7483 }
7484 /*
7485 * (pr == 1) indicates a partial read.
7486 */
7487 if (oldresid > uiop->uio_resid)
7488 pr = 1;
7489 }
7490
7491 if (bp) { /* more data blocks in msg */
7492 more |= MOREDATA;
7493 if (savemp)
7494 savemptail->b_cont = bp;
7495 else
7496 savemp = bp;
7497 }
7498
7499 mutex_enter(&stp->sd_lock);
7500 if (savemp) {
7501 if (flags & (MSG_IPEEK|MSG_DISCARDTAIL)) {
7502 /*
7503 * When MSG_DISCARDTAIL is set or
7504 * when peeking discard any tail. When peeking this
7505 * is the tail of the dup that was copied out - the
7506 * message has already been putback on the queue.
7507 * Return MOREDATA to the caller even though the data
7508 * is discarded. This is used by sockets (to
7509 * set MSG_TRUNC).
7510 */
7511 freemsg(savemp);
7512 if (!(flags & MSG_IPEEK) && (type >= QPCTL)) {
7513 ASSERT(type == M_PCPROTO);
7514 stp->sd_flag &= ~STRPRI;
7515 }
7516 } else if (pr && (savemp->b_datap->db_type == M_DATA) &&
7517 msgnodata(savemp)) {
7518 /*
7519 * Avoid queuing a zero-length tail part of
7520 * a message. pr=1 indicates that we read some of
7521 * the message.
7522 */
7523 freemsg(savemp);
7524 more &= ~MOREDATA;
7525 if (type >= QPCTL) {
7526 ASSERT(type == M_PCPROTO);
7527 stp->sd_flag &= ~STRPRI;
7528 }
7529 } else {
7530 savemp->b_band = pri;
7531 /*
7532 * If the first message was HIPRI and the one we're
7533 * putting back isn't, then clear STRPRI, otherwise
7534 * set STRPRI again. Note that we must set STRPRI
7535 * again since the flush logic in strrput_nondata()
7536 * may have cleared it while we had sd_lock dropped.
7537 */
7538
7539 if (type >= QPCTL) {
7540 ASSERT(type == M_PCPROTO);
7541 if (queclass(savemp) < QPCTL)
7542 stp->sd_flag &= ~STRPRI;
7543 else
7544 stp->sd_flag |= STRPRI;
7545 } else if (queclass(savemp) >= QPCTL) {
7546 /*
7547 * The first message was not a HIPRI message,
7548 * but the one we are about to putback is.
7549 * For simplicitly, we do not allow for HIPRI
7550 * messages to be embedded in the message
7551 * body, so just force it to same type as
7552 * first message.
7553 */
7554 ASSERT(type == M_DATA || type == M_PROTO);
7555 ASSERT(savemp->b_datap->db_type == M_PCPROTO);
7556 savemp->b_datap->db_type = type;
7557 }
7558 if (mark != 0) {
7559 if ((mark & _LASTMARK) &&
7560 (stp->sd_mark == NULL)) {
7561 /*
7562 * If another marked message arrived
7563 * while sd_lock was not held sd_mark
7564 * would be non-NULL.
7565 */
7566 stp->sd_mark = savemp;
7567 }
7568 savemp->b_flag |= mark & ~_LASTMARK;
7569 }
7570 putback(stp, q, savemp, pri);
7571 }
7572 } else if (!(flags & MSG_IPEEK)) {
7573 /*
7574 * The complete message was consumed.
7575 *
7576 * If another M_PCPROTO arrived while sd_lock was not held
7577 * it would have been discarded since STRPRI was still set.
7578 *
7579 * Move the MSG*MARKNEXT information
7580 * to the stream head just in case
7581 * the read queue becomes empty.
7582 * clear stream head hi pri flag based on
7583 * first message
7584 *
7585 * If the stream head was at the mark
7586 * (STRATMARK) before we dropped sd_lock above
7587 * and some data was consumed then we have
7588 * moved past the mark thus STRATMARK is
7589 * cleared. However, if a message arrived in
7590 * strrput during the copyout above causing
7591 * STRATMARK to be set we can not clear that
7592 * flag.
7593 * XXX A "perimeter" would help by single-threading strrput,
7594 * strread, strgetmsg and kstrgetmsg.
7595 */
7596 if (type >= QPCTL) {
7597 ASSERT(type == M_PCPROTO);
7598 stp->sd_flag &= ~STRPRI;
7599 }
7600 if (mark & (MSGMARKNEXT|MSGNOTMARKNEXT|MSGMARK)) {
7601 if (mark & MSGMARKNEXT) {
7602 stp->sd_flag &= ~STRNOTATMARK;
7603 stp->sd_flag |= STRATMARK;
7604 } else if (mark & MSGNOTMARKNEXT) {
7605 stp->sd_flag &= ~STRATMARK;
7606 stp->sd_flag |= STRNOTATMARK;
7607 } else {
7608 stp->sd_flag &= ~(STRATMARK|STRNOTATMARK);
7609 }
7610 } else if (pr && (old_sd_flag & STRATMARK)) {
7611 stp->sd_flag &= ~STRATMARK;
7612 }
7613 }
7614
7615 *flagsp = flg;
7616 *prip = pri;
7617
7618 /*
7619 * Getmsg cleanup processing - if the state of the queue has changed
7620 * some signals may need to be sent and/or poll awakened.
7621 */
7622 getmout:
7623 qbackenable(q, pri);
7624
7625 /*
7626 * We dropped the stream head lock above. Send all M_SIG messages
7627 * before processing stream head for SIGPOLL messages.
7628 */
7629 ASSERT(MUTEX_HELD(&stp->sd_lock));
7630 while ((bp = q->q_first) != NULL &&
7631 (bp->b_datap->db_type == M_SIG)) {
7632 /*
7633 * sd_lock is held so the content of the read queue can not
7634 * change.
7635 */
7636 bp = getq(q);
7637 ASSERT(bp != NULL && bp->b_datap->db_type == M_SIG);
7638
7639 strsignal_nolock(stp, *bp->b_rptr, bp->b_band);
7640 mutex_exit(&stp->sd_lock);
7641 freemsg(bp);
7642 if (STREAM_NEEDSERVICE(stp))
7643 stream_runservice(stp);
7644 mutex_enter(&stp->sd_lock);
7645 }
7646
7647 /*
7648 * stream head cannot change while we make the determination
7649 * whether or not to send a signal. Drop the flag to allow strrput
7650 * to send firstmsgsigs again.
7651 */
7652 stp->sd_flag &= ~STRGETINPROG;
7653
7654 /*
7655 * If the type of message at the front of the queue changed
7656 * due to the receive the appropriate signals and pollwakeup events
7657 * are generated. The type of changes are:
7658 * Processed a hipri message, q_first is not hipri.
7659 * Processed a band X message, and q_first is band Y.
7660 * The generated signals and pollwakeups are identical to what
7661 * strrput() generates should the message that is now on q_first
7662 * arrive to an empty read queue.
7663 *
7664 * Note: only strrput will send a signal for a hipri message.
7665 */
7666 if ((bp = q->q_first) != NULL && !(stp->sd_flag & STRPRI)) {
7667 strsigset_t signals = 0;
7668 strpollset_t pollwakeups = 0;
7669
7670 if (flg & MSG_HIPRI) {
7671 /*
7672 * Removed a hipri message. Regular data at
7673 * the front of the queue.
7674 */
7675 if (bp->b_band == 0) {
7676 signals = S_INPUT | S_RDNORM;
7677 pollwakeups = POLLIN | POLLRDNORM;
7678 } else {
7679 signals = S_INPUT | S_RDBAND;
7680 pollwakeups = POLLIN | POLLRDBAND;
7681 }
7682 } else if (pri != bp->b_band) {
7683 /*
7684 * The band is different for the new q_first.
7685 */
7686 if (bp->b_band == 0) {
7687 signals = S_RDNORM;
7688 pollwakeups = POLLIN | POLLRDNORM;
7689 } else {
7690 signals = S_RDBAND;
7691 pollwakeups = POLLIN | POLLRDBAND;
7692 }
7693 }
7694
7695 if (pollwakeups != 0) {
7696 if (pollwakeups == (POLLIN | POLLRDNORM)) {
7697 if (!(stp->sd_rput_opt & SR_POLLIN))
7698 goto no_pollwake;
7699 stp->sd_rput_opt &= ~SR_POLLIN;
7700 }
7701 mutex_exit(&stp->sd_lock);
7702 pollwakeup(&stp->sd_pollist, pollwakeups);
7703 mutex_enter(&stp->sd_lock);
7704 }
7705 no_pollwake:
7706
7707 if (stp->sd_sigflags & signals)
7708 strsendsig(stp->sd_siglist, signals, bp->b_band, 0);
7709 }
7710 mutex_exit(&stp->sd_lock);
7711
7712 rvp->r_val1 = more;
7713 return (error);
7714 #undef _LASTMARK
7715 }
7716
7717 /*
7718 * Put a message downstream.
7719 *
7720 * NOTE: strputmsg and kstrputmsg have much of the logic in common.
7721 */
7722 int
7723 strputmsg(
7724 struct vnode *vp,
7725 struct strbuf *mctl,
7726 struct strbuf *mdata,
7727 unsigned char pri,
7728 int flag,
7729 int fmode)
7730 {
7731 struct stdata *stp;
7732 queue_t *wqp;
7733 mblk_t *mp;
7734 ssize_t msgsize;
7735 ssize_t rmin, rmax;
7736 int error;
7737 struct uio uios;
7738 struct uio *uiop = &uios;
7739 struct iovec iovs;
7740 int xpg4 = 0;
7741
7742 ASSERT(vp->v_stream);
7743 stp = vp->v_stream;
7744 wqp = stp->sd_wrq;
7745
7746 /*
7747 * If it is an XPG4 application, we need to send
7748 * SIGPIPE below
7749 */
7750
7751 xpg4 = (flag & MSG_XPG4) ? 1 : 0;
7752 flag &= ~MSG_XPG4;
7753
7754 if (AU_AUDITING())
7755 audit_strputmsg(vp, mctl, mdata, pri, flag, fmode);
7756
7757 mutex_enter(&stp->sd_lock);
7758
7759 if ((error = i_straccess(stp, JCWRITE)) != 0) {
7760 mutex_exit(&stp->sd_lock);
7761 return (error);
7762 }
7763
7764 if (stp->sd_flag & (STWRERR|STRHUP|STPLEX)) {
7765 error = strwriteable(stp, B_FALSE, xpg4);
7766 if (error != 0) {
7767 mutex_exit(&stp->sd_lock);
7768 return (error);
7769 }
7770 }
7771
7772 mutex_exit(&stp->sd_lock);
7773
7774 /*
7775 * Check for legal flag value.
7776 */
7777 switch (flag) {
7778 case MSG_HIPRI:
7779 if ((mctl->len < 0) || (pri != 0))
7780 return (EINVAL);
7781 break;
7782 case MSG_BAND:
7783 break;
7784
7785 default:
7786 return (EINVAL);
7787 }
7788
7789 TRACE_1(TR_FAC_STREAMS_FR, TR_STRPUTMSG_IN,
7790 "strputmsg in:stp %p", stp);
7791
7792 /* get these values from those cached in the stream head */
7793 rmin = stp->sd_qn_minpsz;
7794 rmax = stp->sd_qn_maxpsz;
7795
7796 /*
7797 * Make sure ctl and data sizes together fall within the
7798 * limits of the max and min receive packet sizes and do
7799 * not exceed system limit.
7800 */
7801 ASSERT((rmax >= 0) || (rmax == INFPSZ));
7802 if (rmax == 0) {
7803 return (ERANGE);
7804 }
7805 /*
7806 * Use the MAXIMUM of sd_maxblk and q_maxpsz.
7807 * Needed to prevent partial failures in the strmakedata loop.
7808 */
7809 if (stp->sd_maxblk != INFPSZ && rmax != INFPSZ && rmax < stp->sd_maxblk)
7810 rmax = stp->sd_maxblk;
7811
7812 if ((msgsize = mdata->len) < 0) {
7813 msgsize = 0;
7814 rmin = 0; /* no range check for NULL data part */
7815 }
7816 if ((msgsize < rmin) ||
7817 ((msgsize > rmax) && (rmax != INFPSZ)) ||
7818 (mctl->len > strctlsz)) {
7819 return (ERANGE);
7820 }
7821
7822 /*
7823 * Setup uio and iov for data part
7824 */
7825 iovs.iov_base = mdata->buf;
7826 iovs.iov_len = msgsize;
7827 uios.uio_iov = &iovs;
7828 uios.uio_iovcnt = 1;
7829 uios.uio_loffset = 0;
7830 uios.uio_segflg = UIO_USERSPACE;
7831 uios.uio_fmode = fmode;
7832 uios.uio_extflg = UIO_COPY_DEFAULT;
7833 uios.uio_resid = msgsize;
7834 uios.uio_offset = 0;
7835
7836 /* Ignore flow control in strput for HIPRI */
7837 if (flag & MSG_HIPRI)
7838 flag |= MSG_IGNFLOW;
7839
7840 for (;;) {
7841 int done = 0;
7842
7843 /*
7844 * strput will always free the ctl mblk - even when strput
7845 * fails.
7846 */
7847 if ((error = strmakectl(mctl, flag, fmode, &mp)) != 0) {
7848 TRACE_3(TR_FAC_STREAMS_FR, TR_STRPUTMSG_OUT,
7849 "strputmsg out:stp %p out %d error %d",
7850 stp, 1, error);
7851 return (error);
7852 }
7853 /*
7854 * Verify that the whole message can be transferred by
7855 * strput.
7856 */
7857 ASSERT(stp->sd_maxblk == INFPSZ ||
7858 stp->sd_maxblk >= mdata->len);
7859
7860 msgsize = mdata->len;
7861 error = strput(stp, mp, uiop, &msgsize, 0, pri, flag);
7862 mdata->len = msgsize;
7863
7864 if (error == 0)
7865 break;
7866
7867 if (error != EWOULDBLOCK)
7868 goto out;
7869
7870 mutex_enter(&stp->sd_lock);
7871 /*
7872 * Check for a missed wakeup.
7873 * Needed since strput did not hold sd_lock across
7874 * the canputnext.
7875 */
7876 if (bcanputnext(wqp, pri)) {
7877 /* Try again */
7878 mutex_exit(&stp->sd_lock);
7879 continue;
7880 }
7881 TRACE_2(TR_FAC_STREAMS_FR, TR_STRPUTMSG_WAIT,
7882 "strputmsg wait:stp %p waits pri %d", stp, pri);
7883 if (((error = strwaitq(stp, WRITEWAIT, (ssize_t)0, fmode, -1,
7884 &done)) != 0) || done) {
7885 mutex_exit(&stp->sd_lock);
7886 TRACE_3(TR_FAC_STREAMS_FR, TR_STRPUTMSG_OUT,
7887 "strputmsg out:q %p out %d error %d",
7888 stp, 0, error);
7889 return (error);
7890 }
7891 TRACE_1(TR_FAC_STREAMS_FR, TR_STRPUTMSG_WAKE,
7892 "strputmsg wake:stp %p wakes", stp);
7893 if ((error = i_straccess(stp, JCWRITE)) != 0) {
7894 mutex_exit(&stp->sd_lock);
7895 return (error);
7896 }
7897 mutex_exit(&stp->sd_lock);
7898 }
7899 out:
7900 /*
7901 * For historic reasons, applications expect EAGAIN
7902 * when data mblk could not be allocated. so change
7903 * ENOMEM back to EAGAIN
7904 */
7905 if (error == ENOMEM)
7906 error = EAGAIN;
7907 TRACE_3(TR_FAC_STREAMS_FR, TR_STRPUTMSG_OUT,
7908 "strputmsg out:stp %p out %d error %d", stp, 2, error);
7909 return (error);
7910 }
7911
7912 /*
7913 * Put a message downstream.
7914 * Can send only an M_PROTO/M_PCPROTO by passing in a NULL uiop.
7915 * The fmode flag (NDELAY, NONBLOCK) is the or of the flags in the uio
7916 * and the fmode parameter.
7917 *
7918 * This routine handles the consolidation private flags:
7919 * MSG_IGNERROR Ignore any stream head error except STPLEX.
7920 * MSG_HOLDSIG Hold signals while waiting for data.
7921 * MSG_IGNFLOW Don't check streams flow control.
7922 *
7923 * NOTE: strputmsg and kstrputmsg have much of the logic in common.
7924 */
7925 int
7926 kstrputmsg(
7927 struct vnode *vp,
7928 mblk_t *mctl,
7929 struct uio *uiop,
7930 ssize_t msgsize,
7931 unsigned char pri,
7932 int flag,
7933 int fmode)
7934 {
7935 struct stdata *stp;
7936 queue_t *wqp;
7937 ssize_t rmin, rmax;
7938 int error;
7939
7940 ASSERT(vp->v_stream);
7941 stp = vp->v_stream;
7942 wqp = stp->sd_wrq;
7943 if (AU_AUDITING())
7944 audit_strputmsg(vp, NULL, NULL, pri, flag, fmode);
7945 if (mctl == NULL)
7946 return (EINVAL);
7947
7948 mutex_enter(&stp->sd_lock);
7949
7950 if ((error = i_straccess(stp, JCWRITE)) != 0) {
7951 mutex_exit(&stp->sd_lock);
7952 freemsg(mctl);
7953 return (error);
7954 }
7955
7956 if ((stp->sd_flag & STPLEX) || !(flag & MSG_IGNERROR)) {
7957 if (stp->sd_flag & (STWRERR|STRHUP|STPLEX)) {
7958 error = strwriteable(stp, B_FALSE, B_TRUE);
7959 if (error != 0) {
7960 mutex_exit(&stp->sd_lock);
7961 freemsg(mctl);
7962 return (error);
7963 }
7964 }
7965 }
7966
7967 mutex_exit(&stp->sd_lock);
7968
7969 /*
7970 * Check for legal flag value.
7971 */
7972 switch (flag & (MSG_HIPRI|MSG_BAND|MSG_ANY)) {
7973 case MSG_HIPRI:
7974 if (pri != 0) {
7975 freemsg(mctl);
7976 return (EINVAL);
7977 }
7978 break;
7979 case MSG_BAND:
7980 break;
7981 default:
7982 freemsg(mctl);
7983 return (EINVAL);
7984 }
7985
7986 TRACE_1(TR_FAC_STREAMS_FR, TR_KSTRPUTMSG_IN,
7987 "kstrputmsg in:stp %p", stp);
7988
7989 /* get these values from those cached in the stream head */
7990 rmin = stp->sd_qn_minpsz;
7991 rmax = stp->sd_qn_maxpsz;
7992
7993 /*
7994 * Make sure ctl and data sizes together fall within the
7995 * limits of the max and min receive packet sizes and do
7996 * not exceed system limit.
7997 */
7998 ASSERT((rmax >= 0) || (rmax == INFPSZ));
7999 if (rmax == 0) {
8000 freemsg(mctl);
8001 return (ERANGE);
8002 }
8003 /*
8004 * Use the MAXIMUM of sd_maxblk and q_maxpsz.
8005 * Needed to prevent partial failures in the strmakedata loop.
8006 */
8007 if (stp->sd_maxblk != INFPSZ && rmax != INFPSZ && rmax < stp->sd_maxblk)
8008 rmax = stp->sd_maxblk;
8009
8010 if (uiop == NULL) {
8011 msgsize = -1;
8012 rmin = -1; /* no range check for NULL data part */
8013 } else {
8014 /* Use uio flags as well as the fmode parameter flags */
8015 fmode |= uiop->uio_fmode;
8016
8017 if ((msgsize < rmin) ||
8018 ((msgsize > rmax) && (rmax != INFPSZ))) {
8019 freemsg(mctl);
8020 return (ERANGE);
8021 }
8022 }
8023
8024 /* Ignore flow control in strput for HIPRI */
8025 if (flag & MSG_HIPRI)
8026 flag |= MSG_IGNFLOW;
8027
8028 for (;;) {
8029 int done = 0;
8030 int waitflag;
8031 mblk_t *mp;
8032
8033 /*
8034 * strput will always free the ctl mblk - even when strput
8035 * fails. If MSG_IGNFLOW is set then any error returned
8036 * will cause us to break the loop, so we don't need a copy
8037 * of the message. If MSG_IGNFLOW is not set, then we can
8038 * get hit by flow control and be forced to try again. In
8039 * this case we need to have a copy of the message. We
8040 * do this using copymsg since the message may get modified
8041 * by something below us.
8042 *
8043 * We've observed that many TPI providers do not check db_ref
8044 * on the control messages but blindly reuse them for the
8045 * T_OK_ACK/T_ERROR_ACK. Thus using copymsg is more
8046 * friendly to such providers than using dupmsg. Also, note
8047 * that sockfs uses MSG_IGNFLOW for all TPI control messages.
8048 * Only data messages are subject to flow control, hence
8049 * subject to this copymsg.
8050 */
8051 if (flag & MSG_IGNFLOW) {
8052 mp = mctl;
8053 mctl = NULL;
8054 } else {
8055 do {
8056 /*
8057 * If a message has a free pointer, the message
8058 * must be dupmsg to maintain this pointer.
8059 * Code using this facility must be sure
8060 * that modules below will not change the
8061 * contents of the dblk without checking db_ref
8062 * first. If db_ref is > 1, then the module
8063 * needs to do a copymsg first. Otherwise,
8064 * the contents of the dblk may become
8065 * inconsistent because the freesmg/freeb below
8066 * may end up calling atomic_add_32_nv.
8067 * The atomic_add_32_nv in freeb (accessing
8068 * all of db_ref, db_type, db_flags, and
8069 * db_struioflag) does not prevent other threads
8070 * from concurrently trying to modify e.g.
8071 * db_type.
8072 */
8073 if (mctl->b_datap->db_frtnp != NULL)
8074 mp = dupmsg(mctl);
8075 else
8076 mp = copymsg(mctl);
8077
8078 if (mp != NULL)
8079 break;
8080
8081 error = strwaitbuf(msgdsize(mctl), BPRI_MED);
8082 if (error) {
8083 freemsg(mctl);
8084 return (error);
8085 }
8086 } while (mp == NULL);
8087 }
8088 /*
8089 * Verify that all of msgsize can be transferred by
8090 * strput.
8091 */
8092 ASSERT(stp->sd_maxblk == INFPSZ || stp->sd_maxblk >= msgsize);
8093 error = strput(stp, mp, uiop, &msgsize, 0, pri, flag);
8094 if (error == 0)
8095 break;
8096
8097 if (error != EWOULDBLOCK)
8098 goto out;
8099
8100 /*
8101 * IF MSG_IGNFLOW is set we should have broken out of loop
8102 * above.
8103 */
8104 ASSERT(!(flag & MSG_IGNFLOW));
8105 mutex_enter(&stp->sd_lock);
8106 /*
8107 * Check for a missed wakeup.
8108 * Needed since strput did not hold sd_lock across
8109 * the canputnext.
8110 */
8111 if (bcanputnext(wqp, pri)) {
8112 /* Try again */
8113 mutex_exit(&stp->sd_lock);
8114 continue;
8115 }
8116 TRACE_2(TR_FAC_STREAMS_FR, TR_KSTRPUTMSG_WAIT,
8117 "kstrputmsg wait:stp %p waits pri %d", stp, pri);
8118
8119 waitflag = WRITEWAIT;
8120 if (flag & (MSG_HOLDSIG|MSG_IGNERROR)) {
8121 if (flag & MSG_HOLDSIG)
8122 waitflag |= STR_NOSIG;
8123 if (flag & MSG_IGNERROR)
8124 waitflag |= STR_NOERROR;
8125 }
8126 if (((error = strwaitq(stp, waitflag,
8127 (ssize_t)0, fmode, -1, &done)) != 0) || done) {
8128 mutex_exit(&stp->sd_lock);
8129 TRACE_3(TR_FAC_STREAMS_FR, TR_KSTRPUTMSG_OUT,
8130 "kstrputmsg out:stp %p out %d error %d",
8131 stp, 0, error);
8132 freemsg(mctl);
8133 return (error);
8134 }
8135 TRACE_1(TR_FAC_STREAMS_FR, TR_KSTRPUTMSG_WAKE,
8136 "kstrputmsg wake:stp %p wakes", stp);
8137 if ((error = i_straccess(stp, JCWRITE)) != 0) {
8138 mutex_exit(&stp->sd_lock);
8139 freemsg(mctl);
8140 return (error);
8141 }
8142 mutex_exit(&stp->sd_lock);
8143 }
8144 out:
8145 freemsg(mctl);
8146 /*
8147 * For historic reasons, applications expect EAGAIN
8148 * when data mblk could not be allocated. so change
8149 * ENOMEM back to EAGAIN
8150 */
8151 if (error == ENOMEM)
8152 error = EAGAIN;
8153 TRACE_3(TR_FAC_STREAMS_FR, TR_KSTRPUTMSG_OUT,
8154 "kstrputmsg out:stp %p out %d error %d", stp, 2, error);
8155 return (error);
8156 }
8157
8158 /*
8159 * Determines whether the necessary conditions are set on a stream
8160 * for it to be readable, writeable, or have exceptions.
8161 *
8162 * strpoll handles the consolidation private events:
8163 * POLLNOERR Do not return POLLERR even if there are stream
8164 * head errors.
8165 * Used by sockfs.
8166 * POLLRDDATA Do not return POLLIN unless at least one message on
8167 * the queue contains one or more M_DATA mblks. Thus
8168 * when this flag is set a queue with only
8169 * M_PROTO/M_PCPROTO mblks does not return POLLIN.
8170 * Used by sockfs to ignore T_EXDATA_IND messages.
8171 *
8172 * Note: POLLRDDATA assumes that synch streams only return messages with
8173 * an M_DATA attached (i.e. not messages consisting of only
8174 * an M_PROTO/M_PCPROTO part).
8175 */
8176 int
8177 strpoll(
8178 struct stdata *stp,
8179 short events_arg,
8180 int anyyet,
8181 short *reventsp,
8182 struct pollhead **phpp)
8183 {
8184 int events = (ushort_t)events_arg;
8185 int retevents = 0;
8186 mblk_t *mp;
8187 qband_t *qbp;
8188 long sd_flags = stp->sd_flag;
8189 int headlocked = 0;
8190
8191 /*
8192 * For performance, a single 'if' tests for most possible edge
8193 * conditions in one shot
8194 */
8195 if (sd_flags & (STPLEX | STRDERR | STWRERR)) {
8196 if (sd_flags & STPLEX) {
8197 *reventsp = POLLNVAL;
8198 return (EINVAL);
8199 }
8200 if (((events & (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) &&
8201 (sd_flags & STRDERR)) ||
8202 ((events & (POLLOUT | POLLWRNORM | POLLWRBAND)) &&
8203 (sd_flags & STWRERR))) {
8204 if (!(events & POLLNOERR)) {
8205 *reventsp = POLLERR;
8206 return (0);
8207 }
8208 }
8209 }
8210 if (sd_flags & STRHUP) {
8211 retevents |= POLLHUP;
8212 } else if (events & (POLLWRNORM | POLLWRBAND)) {
8213 queue_t *tq;
8214 queue_t *qp = stp->sd_wrq;
8215
8216 claimstr(qp);
8217 /* Find next module forward that has a service procedure */
8218 tq = qp->q_next->q_nfsrv;
8219 ASSERT(tq != NULL);
8220
8221 polllock(&stp->sd_pollist, QLOCK(tq));
8222 if (events & POLLWRNORM) {
8223 queue_t *sqp;
8224
8225 if (tq->q_flag & QFULL)
8226 /* ensure backq svc procedure runs */
8227 tq->q_flag |= QWANTW;
8228 else if ((sqp = stp->sd_struiowrq) != NULL) {
8229 /* Check sync stream barrier write q */
8230 mutex_exit(QLOCK(tq));
8231 polllock(&stp->sd_pollist, QLOCK(sqp));
8232 if (sqp->q_flag & QFULL)
8233 /* ensure pollwakeup() is done */
8234 sqp->q_flag |= QWANTWSYNC;
8235 else
8236 retevents |= POLLOUT;
8237 /* More write events to process ??? */
8238 if (! (events & POLLWRBAND)) {
8239 mutex_exit(QLOCK(sqp));
8240 releasestr(qp);
8241 goto chkrd;
8242 }
8243 mutex_exit(QLOCK(sqp));
8244 polllock(&stp->sd_pollist, QLOCK(tq));
8245 } else
8246 retevents |= POLLOUT;
8247 }
8248 if (events & POLLWRBAND) {
8249 qbp = tq->q_bandp;
8250 if (qbp) {
8251 while (qbp) {
8252 if (qbp->qb_flag & QB_FULL)
8253 qbp->qb_flag |= QB_WANTW;
8254 else
8255 retevents |= POLLWRBAND;
8256 qbp = qbp->qb_next;
8257 }
8258 } else {
8259 retevents |= POLLWRBAND;
8260 }
8261 }
8262 mutex_exit(QLOCK(tq));
8263 releasestr(qp);
8264 }
8265 chkrd:
8266 if (sd_flags & STRPRI) {
8267 retevents |= (events & POLLPRI);
8268 } else if (events & (POLLRDNORM | POLLRDBAND | POLLIN)) {
8269 queue_t *qp = _RD(stp->sd_wrq);
8270 int normevents = (events & (POLLIN | POLLRDNORM));
8271
8272 /*
8273 * Note: Need to do polllock() here since ps_lock may be
8274 * held. See bug 4191544.
8275 */
8276 polllock(&stp->sd_pollist, &stp->sd_lock);
8277 headlocked = 1;
8278 mp = qp->q_first;
8279 while (mp) {
8280 /*
8281 * For POLLRDDATA we scan b_cont and b_next until we
8282 * find an M_DATA.
8283 */
8284 if ((events & POLLRDDATA) &&
8285 mp->b_datap->db_type != M_DATA) {
8286 mblk_t *nmp = mp->b_cont;
8287
8288 while (nmp != NULL &&
8289 nmp->b_datap->db_type != M_DATA)
8290 nmp = nmp->b_cont;
8291 if (nmp == NULL) {
8292 mp = mp->b_next;
8293 continue;
8294 }
8295 }
8296 if (mp->b_band == 0)
8297 retevents |= normevents;
8298 else
8299 retevents |= (events & (POLLIN | POLLRDBAND));
8300 break;
8301 }
8302 if (! (retevents & normevents) &&
8303 (stp->sd_wakeq & RSLEEP)) {
8304 /*
8305 * Sync stream barrier read queue has data.
8306 */
8307 retevents |= normevents;
8308 }
8309 /* Treat eof as normal data */
8310 if (sd_flags & STREOF)
8311 retevents |= normevents;
8312 }
8313
8314 *reventsp = (short)retevents;
8315 if (retevents) {
8316 if (headlocked)
8317 mutex_exit(&stp->sd_lock);
8318 return (0);
8319 }
8320
8321 /*
8322 * If poll() has not found any events yet, set up event cell
8323 * to wake up the poll if a requested event occurs on this
8324 * stream. Check for collisions with outstanding poll requests.
8325 */
8326 if (!anyyet) {
8327 *phpp = &stp->sd_pollist;
8328 if (headlocked == 0) {
8329 polllock(&stp->sd_pollist, &stp->sd_lock);
8330 headlocked = 1;
8331 }
8332 stp->sd_rput_opt |= SR_POLLIN;
8333 }
8334 if (headlocked)
8335 mutex_exit(&stp->sd_lock);
8336 return (0);
8337 }
8338
8339 /*
8340 * The purpose of putback() is to assure sleeping polls/reads
8341 * are awakened when there are no new messages arriving at the,
8342 * stream head, and a message is placed back on the read queue.
8343 *
8344 * sd_lock must be held when messages are placed back on stream
8345 * head. (getq() holds sd_lock when it removes messages from
8346 * the queue)
8347 */
8348
8349 static void
8350 putback(struct stdata *stp, queue_t *q, mblk_t *bp, int band)
8351 {
8352 mblk_t *qfirst;
8353 ASSERT(MUTEX_HELD(&stp->sd_lock));
8354
8355 /*
8356 * As a result of lock-step ordering around q_lock and sd_lock,
8357 * it's possible for function calls like putnext() and
8358 * canputnext() to get an inaccurate picture of how much
8359 * data is really being processed at the stream head.
8360 * We only consolidate with existing messages on the queue
8361 * if the length of the message we want to put back is smaller
8362 * than the queue hiwater mark.
8363 */
8364 if ((stp->sd_rput_opt & SR_CONSOL_DATA) &&
8365 (DB_TYPE(bp) == M_DATA) && ((qfirst = q->q_first) != NULL) &&
8366 (DB_TYPE(qfirst) == M_DATA) &&
8367 ((qfirst->b_flag & (MSGMARK|MSGDELIM)) == 0) &&
8368 ((bp->b_flag & (MSGMARK|MSGDELIM|MSGMARKNEXT)) == 0) &&
8369 (mp_cont_len(bp, NULL) < q->q_hiwat)) {
8370 /*
8371 * We use the same logic as defined in strrput()
8372 * but in reverse as we are putting back onto the
8373 * queue and want to retain byte ordering.
8374 * Consolidate M_DATA messages with M_DATA ONLY.
8375 * strrput() allows the consolidation of M_DATA onto
8376 * M_PROTO | M_PCPROTO but not the other way round.
8377 *
8378 * The consolidation does not take place if the message
8379 * we are returning to the queue is marked with either
8380 * of the marks or the delim flag or if q_first
8381 * is marked with MSGMARK. The MSGMARK check is needed to
8382 * handle the odd semantics of MSGMARK where essentially
8383 * the whole message is to be treated as marked.
8384 * Carry any MSGMARKNEXT and MSGNOTMARKNEXT from q_first
8385 * to the front of the b_cont chain.
8386 */
8387 rmvq_noenab(q, qfirst);
8388
8389 /*
8390 * The first message in the b_cont list
8391 * tracks MSGMARKNEXT and MSGNOTMARKNEXT.
8392 * We need to handle the case where we
8393 * are appending:
8394 *
8395 * 1) a MSGMARKNEXT to a MSGNOTMARKNEXT.
8396 * 2) a MSGMARKNEXT to a plain message.
8397 * 3) a MSGNOTMARKNEXT to a plain message
8398 * 4) a MSGNOTMARKNEXT to a MSGNOTMARKNEXT
8399 * message.
8400 *
8401 * Thus we never append a MSGMARKNEXT or
8402 * MSGNOTMARKNEXT to a MSGMARKNEXT message.
8403 */
8404 if (qfirst->b_flag & MSGMARKNEXT) {
8405 bp->b_flag |= MSGMARKNEXT;
8406 bp->b_flag &= ~MSGNOTMARKNEXT;
8407 qfirst->b_flag &= ~MSGMARKNEXT;
8408 } else if (qfirst->b_flag & MSGNOTMARKNEXT) {
8409 bp->b_flag |= MSGNOTMARKNEXT;
8410 qfirst->b_flag &= ~MSGNOTMARKNEXT;
8411 }
8412
8413 linkb(bp, qfirst);
8414 }
8415 (void) putbq(q, bp);
8416
8417 /*
8418 * A message may have come in when the sd_lock was dropped in the
8419 * calling routine. If this is the case and STR*ATMARK info was
8420 * received, need to move that from the stream head to the q_last
8421 * so that SIOCATMARK can return the proper value.
8422 */
8423 if (stp->sd_flag & (STRATMARK | STRNOTATMARK)) {
8424 unsigned short *flagp = &q->q_last->b_flag;
8425 uint_t b_flag = (uint_t)*flagp;
8426
8427 if (stp->sd_flag & STRATMARK) {
8428 b_flag &= ~MSGNOTMARKNEXT;
8429 b_flag |= MSGMARKNEXT;
8430 stp->sd_flag &= ~STRATMARK;
8431 } else {
8432 b_flag &= ~MSGMARKNEXT;
8433 b_flag |= MSGNOTMARKNEXT;
8434 stp->sd_flag &= ~STRNOTATMARK;
8435 }
8436 *flagp = (unsigned short) b_flag;
8437 }
8438
8439 #ifdef DEBUG
8440 /*
8441 * Make sure that the flags are not messed up.
8442 */
8443 {
8444 mblk_t *mp;
8445 mp = q->q_last;
8446 while (mp != NULL) {
8447 ASSERT((mp->b_flag & (MSGMARKNEXT|MSGNOTMARKNEXT)) !=
8448 (MSGMARKNEXT|MSGNOTMARKNEXT));
8449 mp = mp->b_cont;
8450 }
8451 }
8452 #endif
8453 if (q->q_first == bp) {
8454 short pollevents;
8455
8456 if (stp->sd_flag & RSLEEP) {
8457 stp->sd_flag &= ~RSLEEP;
8458 cv_broadcast(&q->q_wait);
8459 }
8460 if (stp->sd_flag & STRPRI) {
8461 pollevents = POLLPRI;
8462 } else {
8463 if (band == 0) {
8464 if (!(stp->sd_rput_opt & SR_POLLIN))
8465 return;
8466 stp->sd_rput_opt &= ~SR_POLLIN;
8467 pollevents = POLLIN | POLLRDNORM;
8468 } else {
8469 pollevents = POLLIN | POLLRDBAND;
8470 }
8471 }
8472 mutex_exit(&stp->sd_lock);
8473 pollwakeup(&stp->sd_pollist, pollevents);
8474 mutex_enter(&stp->sd_lock);
8475 }
8476 }
8477
8478 /*
8479 * Return the held vnode attached to the stream head of a
8480 * given queue
8481 * It is the responsibility of the calling routine to ensure
8482 * that the queue does not go away (e.g. pop).
8483 */
8484 vnode_t *
8485 strq2vp(queue_t *qp)
8486 {
8487 vnode_t *vp;
8488 vp = STREAM(qp)->sd_vnode;
8489 ASSERT(vp != NULL);
8490 VN_HOLD(vp);
8491 return (vp);
8492 }
8493
8494 /*
8495 * return the stream head write queue for the given vp
8496 * It is the responsibility of the calling routine to ensure
8497 * that the stream or vnode do not close.
8498 */
8499 queue_t *
8500 strvp2wq(vnode_t *vp)
8501 {
8502 ASSERT(vp->v_stream != NULL);
8503 return (vp->v_stream->sd_wrq);
8504 }
8505
8506 /*
8507 * pollwakeup stream head
8508 * It is the responsibility of the calling routine to ensure
8509 * that the stream or vnode do not close.
8510 */
8511 void
8512 strpollwakeup(vnode_t *vp, short event)
8513 {
8514 ASSERT(vp->v_stream);
8515 pollwakeup(&vp->v_stream->sd_pollist, event);
8516 }
8517
8518 /*
8519 * Mate the stream heads of two vnodes together. If the two vnodes are the
8520 * same, we just make the write-side point at the read-side -- otherwise,
8521 * we do a full mate. Only works on vnodes associated with streams that are
8522 * still being built and thus have only a stream head.
8523 */
8524 void
8525 strmate(vnode_t *vp1, vnode_t *vp2)
8526 {
8527 queue_t *wrq1 = strvp2wq(vp1);
8528 queue_t *wrq2 = strvp2wq(vp2);
8529
8530 /*
8531 * Verify that there are no modules on the stream yet. We also
8532 * rely on the stream head always having a service procedure to
8533 * avoid tweaking q_nfsrv.
8534 */
8535 ASSERT(wrq1->q_next == NULL && wrq2->q_next == NULL);
8536 ASSERT(wrq1->q_qinfo->qi_srvp != NULL);
8537 ASSERT(wrq2->q_qinfo->qi_srvp != NULL);
8538
8539 /*
8540 * If the queues are the same, just twist; otherwise do a full mate.
8541 */
8542 if (wrq1 == wrq2) {
8543 wrq1->q_next = _RD(wrq1);
8544 } else {
8545 wrq1->q_next = _RD(wrq2);
8546 wrq2->q_next = _RD(wrq1);
8547 STREAM(wrq1)->sd_mate = STREAM(wrq2);
8548 STREAM(wrq1)->sd_flag |= STRMATE;
8549 STREAM(wrq2)->sd_mate = STREAM(wrq1);
8550 STREAM(wrq2)->sd_flag |= STRMATE;
8551 }
8552 }
8553
8554 /*
8555 * XXX will go away when console is correctly fixed.
8556 * Clean up the console PIDS, from previous I_SETSIG,
8557 * called only for cnopen which never calls strclean().
8558 */
8559 void
8560 str_cn_clean(struct vnode *vp)
8561 {
8562 strsig_t *ssp, *pssp, *tssp;
8563 struct stdata *stp;
8564 struct pid *pidp;
8565 int update = 0;
8566
8567 ASSERT(vp->v_stream);
8568 stp = vp->v_stream;
8569 pssp = NULL;
8570 mutex_enter(&stp->sd_lock);
8571 ssp = stp->sd_siglist;
8572 while (ssp) {
8573 mutex_enter(&pidlock);
8574 pidp = ssp->ss_pidp;
8575 /*
8576 * Get rid of PID if the proc is gone.
8577 */
8578 if (pidp->pid_prinactive) {
8579 tssp = ssp->ss_next;
8580 if (pssp)
8581 pssp->ss_next = tssp;
8582 else
8583 stp->sd_siglist = tssp;
8584 ASSERT(pidp->pid_ref <= 1);
8585 PID_RELE(ssp->ss_pidp);
8586 mutex_exit(&pidlock);
8587 kmem_free(ssp, sizeof (strsig_t));
8588 update = 1;
8589 ssp = tssp;
8590 continue;
8591 } else
8592 mutex_exit(&pidlock);
8593 pssp = ssp;
8594 ssp = ssp->ss_next;
8595 }
8596 if (update) {
8597 stp->sd_sigflags = 0;
8598 for (ssp = stp->sd_siglist; ssp; ssp = ssp->ss_next)
8599 stp->sd_sigflags |= ssp->ss_events;
8600 }
8601 mutex_exit(&stp->sd_lock);
8602 }
8603
8604 /*
8605 * Return B_TRUE if there is data in the message, B_FALSE otherwise.
8606 */
8607 static boolean_t
8608 msghasdata(mblk_t *bp)
8609 {
8610 for (; bp; bp = bp->b_cont)
8611 if (bp->b_datap->db_type == M_DATA) {
8612 ASSERT(bp->b_wptr >= bp->b_rptr);
8613 if (bp->b_wptr > bp->b_rptr)
8614 return (B_TRUE);
8615 }
8616 return (B_FALSE);
8617 }