1/*	$NetBSD: svc.c,v 1.21 2000/07/06 03:10:35 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 *   this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 *   this list of conditions and the following disclaimer in the documentation
13 *   and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 *   contributors may be used to endorse or promote products derived
16 *   from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#if defined(LIBC_SCCS) && !defined(lint)
32static char *sccsid2 = "@(#)svc.c 1.44 88/02/08 Copyr 1984 Sun Micro";
33static char *sccsid = "@(#)svc.c	2.4 88/08/11 4.0 RPCSRC";
34#endif
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD$");
37
38/*
39 * svc.c, Server-side remote procedure call interface.
40 *
41 * There are two sets of procedures here.  The xprt routines are
42 * for handling transport handles.  The svc routines handle the
43 * list of service routines.
44 *
45 * Copyright (C) 1984, Sun Microsystems, Inc.
46 */
47
48#include "namespace.h"
49#include "reentrant.h"
50#include <sys/types.h>
51#include <sys/poll.h>
52#include <assert.h>
53#include <errno.h>
54#include <stdlib.h>
55#include <string.h>
56
57#include <rpc/rpc.h>
58#ifdef PORTMAP
59#include <rpc/pmap_clnt.h>
60#endif				/* PORTMAP */
61#include "un-namespace.h"
62
63#include "rpc_com.h"
64#include "mt_misc.h"
65
66#define	RQCRED_SIZE	400		/* this size is excessive */
67
68#define SVC_VERSQUIET 0x0001		/* keep quiet about vers mismatch */
69#define version_keepquiet(xp) (SVC_EXT(xp)->xp_flags & SVC_VERSQUIET)
70
71#define max(a, b) (a > b ? a : b)
72
73/*
74 * The services list
75 * Each entry represents a set of procedures (an rpc program).
76 * The dispatch routine takes request structs and runs the
77 * appropriate procedure.
78 */
79static struct svc_callout {
80	struct svc_callout *sc_next;
81	rpcprog_t	    sc_prog;
82	rpcvers_t	    sc_vers;
83	char		   *sc_netid;
84	void		    (*sc_dispatch)(struct svc_req *, SVCXPRT *);
85} *svc_head;
86
87SVCXPRT **__svc_xports;
88int __svc_maxrec;
89
90static struct svc_callout *svc_find(rpcprog_t, rpcvers_t,
91    struct svc_callout **, char *);
92static void __xprt_do_unregister (SVCXPRT *xprt, bool_t dolock);
93
94/* ***************  SVCXPRT related stuff **************** */
95
96/*
97 * Activate a transport handle.
98 */
99void
100xprt_register(SVCXPRT *xprt)
101{
102	int sock;
103
104	assert(xprt != NULL);
105
106	sock = xprt->xp_fd;
107
108	rwlock_wrlock(&svc_fd_lock);
109	if (__svc_xports == NULL) {
110		__svc_xports = (SVCXPRT **)
111			mem_alloc(FD_SETSIZE * sizeof(SVCXPRT *));
112		if (__svc_xports == NULL) {
113			rwlock_unlock(&svc_fd_lock);
114			return;
115		}
116		memset(__svc_xports, '\0', FD_SETSIZE * sizeof(SVCXPRT *));
117	}
118	if (sock < FD_SETSIZE) {
119		__svc_xports[sock] = xprt;
120		FD_SET(sock, &svc_fdset);
121		svc_maxfd = max(svc_maxfd, sock);
122	}
123	rwlock_unlock(&svc_fd_lock);
124}
125
126void
127xprt_unregister(SVCXPRT *xprt)
128{
129	__xprt_do_unregister(xprt, TRUE);
130}
131
132void
133__xprt_unregister_unlocked(SVCXPRT *xprt)
134{
135	__xprt_do_unregister(xprt, FALSE);
136}
137
138/*
139 * De-activate a transport handle.
140 */
141static void
142__xprt_do_unregister(SVCXPRT *xprt, bool_t dolock)
143{
144	int sock;
145
146	assert(xprt != NULL);
147
148	sock = xprt->xp_fd;
149
150	if (dolock)
151		rwlock_wrlock(&svc_fd_lock);
152	if ((sock < FD_SETSIZE) && (__svc_xports[sock] == xprt)) {
153		__svc_xports[sock] = NULL;
154		FD_CLR(sock, &svc_fdset);
155		if (sock >= svc_maxfd) {
156			for (svc_maxfd--; svc_maxfd>=0; svc_maxfd--)
157				if (__svc_xports[svc_maxfd])
158					break;
159		}
160	}
161	if (dolock)
162		rwlock_unlock(&svc_fd_lock);
163}
164
165/*
166 * Add a service program to the callout list.
167 * The dispatch routine will be called when a rpc request for this
168 * program number comes in.
169 */
170bool_t
171svc_reg(SVCXPRT *xprt, const rpcprog_t prog, const rpcvers_t vers,
172    void (*dispatch)(struct svc_req *, SVCXPRT *),
173    const struct netconfig *nconf)
174{
175	bool_t dummy;
176	struct svc_callout *prev;
177	struct svc_callout *s;
178	struct netconfig *tnconf;
179	char *netid = NULL;
180	int flag = 0;
181
182/* VARIABLES PROTECTED BY svc_lock: s, prev, svc_head */
183
184	if (xprt->xp_netid) {
185		netid = strdup(xprt->xp_netid);
186		flag = 1;
187	} else if (nconf && nconf->nc_netid) {
188		netid = strdup(nconf->nc_netid);
189		flag = 1;
190	} else if ((tnconf = __rpcgettp(xprt->xp_fd)) != NULL) {
191		netid = strdup(tnconf->nc_netid);
192		flag = 1;
193		freenetconfigent(tnconf);
194	} /* must have been created with svc_raw_create */
195	if ((netid == NULL) && (flag == 1)) {
196		return (FALSE);
197	}
198
199	rwlock_wrlock(&svc_lock);
200	if ((s = svc_find(prog, vers, &prev, netid)) != NULL) {
201		free(netid);
202		if (s->sc_dispatch == dispatch)
203			goto rpcb_it; /* he is registering another xptr */
204		rwlock_unlock(&svc_lock);
205		return (FALSE);
206	}
207	s = mem_alloc(sizeof (struct svc_callout));
208	if (s == NULL) {
209		free(netid);
210		rwlock_unlock(&svc_lock);
211		return (FALSE);
212	}
213
214	s->sc_prog = prog;
215	s->sc_vers = vers;
216	s->sc_dispatch = dispatch;
217	s->sc_netid = netid;
218	s->sc_next = svc_head;
219	svc_head = s;
220
221	if ((xprt->xp_netid == NULL) && (flag == 1) && netid)
222		((SVCXPRT *) xprt)->xp_netid = strdup(netid);
223
224rpcb_it:
225	rwlock_unlock(&svc_lock);
226	/* now register the information with the local binder service */
227	if (nconf) {
228		/*LINTED const castaway*/
229		dummy = rpcb_set(prog, vers, (struct netconfig *) nconf,
230		&((SVCXPRT *) xprt)->xp_ltaddr);
231		return (dummy);
232	}
233	return (TRUE);
234}
235
236/*
237 * Remove a service program from the callout list.
238 */
239void
240svc_unreg(const rpcprog_t prog, const rpcvers_t vers)
241{
242	struct svc_callout *prev;
243	struct svc_callout *s;
244
245	/* unregister the information anyway */
246	(void) rpcb_unset(prog, vers, NULL);
247	rwlock_wrlock(&svc_lock);
248	while ((s = svc_find(prog, vers, &prev, NULL)) != NULL) {
249		if (prev == NULL) {
250			svc_head = s->sc_next;
251		} else {
252			prev->sc_next = s->sc_next;
253		}
254		s->sc_next = NULL;
255		if (s->sc_netid)
256			mem_free(s->sc_netid, sizeof (s->sc_netid) + 1);
257		mem_free(s, sizeof (struct svc_callout));
258	}
259	rwlock_unlock(&svc_lock);
260}
261
262/* ********************** CALLOUT list related stuff ************* */
263
264#ifdef PORTMAP
265/*
266 * Add a service program to the callout list.
267 * The dispatch routine will be called when a rpc request for this
268 * program number comes in.
269 */
270bool_t
271svc_register(SVCXPRT *xprt, u_long prog, u_long vers,
272    void (*dispatch)(struct svc_req *, SVCXPRT *),
273    int protocol)
274{
275	struct svc_callout *prev;
276	struct svc_callout *s;
277
278	assert(xprt != NULL);
279	assert(dispatch != NULL);
280
281	if ((s = svc_find((rpcprog_t)prog, (rpcvers_t)vers, &prev, NULL)) !=
282	    NULL) {
283		if (s->sc_dispatch == dispatch)
284			goto pmap_it;  /* he is registering another xptr */
285		return (FALSE);
286	}
287	s = mem_alloc(sizeof(struct svc_callout));
288	if (s == NULL) {
289		return (FALSE);
290	}
291	s->sc_prog = (rpcprog_t)prog;
292	s->sc_vers = (rpcvers_t)vers;
293	s->sc_dispatch = dispatch;
294	s->sc_next = svc_head;
295	svc_head = s;
296pmap_it:
297	/* now register the information with the local binder service */
298	if (protocol) {
299		return (pmap_set(prog, vers, protocol, xprt->xp_port));
300	}
301	return (TRUE);
302}
303
304/*
305 * Remove a service program from the callout list.
306 */
307void
308svc_unregister(u_long prog, u_long vers)
309{
310	struct svc_callout *prev;
311	struct svc_callout *s;
312
313	if ((s = svc_find((rpcprog_t)prog, (rpcvers_t)vers, &prev, NULL)) ==
314	    NULL)
315		return;
316	if (prev == NULL) {
317		svc_head = s->sc_next;
318	} else {
319		prev->sc_next = s->sc_next;
320	}
321	s->sc_next = NULL;
322	mem_free(s, sizeof(struct svc_callout));
323	/* now unregister the information with the local binder service */
324	(void)pmap_unset(prog, vers);
325}
326#endif				/* PORTMAP */
327
328/*
329 * Search the callout list for a program number, return the callout
330 * struct.
331 */
332static struct svc_callout *
333svc_find(rpcprog_t prog, rpcvers_t vers, struct svc_callout **prev,
334    char *netid)
335{
336	struct svc_callout *s, *p;
337
338	assert(prev != NULL);
339
340	p = NULL;
341	for (s = svc_head; s != NULL; s = s->sc_next) {
342		if (((s->sc_prog == prog) && (s->sc_vers == vers)) &&
343		    ((netid == NULL) || (s->sc_netid == NULL) ||
344		    (strcmp(netid, s->sc_netid) == 0)))
345			break;
346		p = s;
347	}
348	*prev = p;
349	return (s);
350}
351
352/* ******************* REPLY GENERATION ROUTINES  ************ */
353
354/*
355 * Send a reply to an rpc request
356 */
357bool_t
358svc_sendreply(SVCXPRT *xprt, xdrproc_t xdr_results,
359    void * xdr_location)
360{
361	struct rpc_msg rply;
362
363	assert(xprt != NULL);
364
365	rply.rm_direction = REPLY;
366	rply.rm_reply.rp_stat = MSG_ACCEPTED;
367	rply.acpted_rply.ar_verf = xprt->xp_verf;
368	rply.acpted_rply.ar_stat = SUCCESS;
369	rply.acpted_rply.ar_results.where = xdr_location;
370	rply.acpted_rply.ar_results.proc = xdr_results;
371	return (SVC_REPLY(xprt, &rply));
372}
373
374/*
375 * No procedure error reply
376 */
377void
378svcerr_noproc(SVCXPRT *xprt)
379{
380	struct rpc_msg rply;
381
382	assert(xprt != NULL);
383
384	rply.rm_direction = REPLY;
385	rply.rm_reply.rp_stat = MSG_ACCEPTED;
386	rply.acpted_rply.ar_verf = xprt->xp_verf;
387	rply.acpted_rply.ar_stat = PROC_UNAVAIL;
388	SVC_REPLY(xprt, &rply);
389}
390
391/*
392 * Can't decode args error reply
393 */
394void
395svcerr_decode(SVCXPRT *xprt)
396{
397	struct rpc_msg rply;
398
399	assert(xprt != NULL);
400
401	rply.rm_direction = REPLY;
402	rply.rm_reply.rp_stat = MSG_ACCEPTED;
403	rply.acpted_rply.ar_verf = xprt->xp_verf;
404	rply.acpted_rply.ar_stat = GARBAGE_ARGS;
405	SVC_REPLY(xprt, &rply);
406}
407
408/*
409 * Some system error
410 */
411void
412svcerr_systemerr(SVCXPRT *xprt)
413{
414	struct rpc_msg rply;
415
416	assert(xprt != NULL);
417
418	rply.rm_direction = REPLY;
419	rply.rm_reply.rp_stat = MSG_ACCEPTED;
420	rply.acpted_rply.ar_verf = xprt->xp_verf;
421	rply.acpted_rply.ar_stat = SYSTEM_ERR;
422	SVC_REPLY(xprt, &rply);
423}
424
425#if 0
426/*
427 * Tell RPC package to not complain about version errors to the client.	 This
428 * is useful when revving broadcast protocols that sit on a fixed address.
429 * There is really one (or should be only one) example of this kind of
430 * protocol: the portmapper (or rpc binder).
431 */
432void
433__svc_versquiet_on(SVCXPRT *xprt)
434{
435
436	SVC_EXT(xprt)->xp_flags |= SVC_VERSQUIET;
437}
438
439void
440__svc_versquiet_off(SVCXPRT *xprt)
441{
442
443	SVC_EXT(xprt)->xp_flags &= ~SVC_VERSQUIET;
444}
445
446void
447svc_versquiet(SVCXPRT *xprt)
448{
449	__svc_versquiet_on(xprt);
450}
451
452int
453__svc_versquiet_get(SVCXPRT *xprt)
454{
455
456	return (SVC_EXT(xprt)->xp_flags & SVC_VERSQUIET);
457}
458#endif
459
460/*
461 * Authentication error reply
462 */
463void
464svcerr_auth(SVCXPRT *xprt, enum auth_stat why)
465{
466	struct rpc_msg rply;
467
468	assert(xprt != NULL);
469
470	rply.rm_direction = REPLY;
471	rply.rm_reply.rp_stat = MSG_DENIED;
472	rply.rjcted_rply.rj_stat = AUTH_ERROR;
473	rply.rjcted_rply.rj_why = why;
474	SVC_REPLY(xprt, &rply);
475}
476
477/*
478 * Auth too weak error reply
479 */
480void
481svcerr_weakauth(SVCXPRT *xprt)
482{
483
484	assert(xprt != NULL);
485
486	svcerr_auth(xprt, AUTH_TOOWEAK);
487}
488
489/*
490 * Program unavailable error reply
491 */
492void
493svcerr_noprog(SVCXPRT *xprt)
494{
495	struct rpc_msg rply;
496
497	assert(xprt != NULL);
498
499	rply.rm_direction = REPLY;
500	rply.rm_reply.rp_stat = MSG_ACCEPTED;
501	rply.acpted_rply.ar_verf = xprt->xp_verf;
502	rply.acpted_rply.ar_stat = PROG_UNAVAIL;
503	SVC_REPLY(xprt, &rply);
504}
505
506/*
507 * Program version mismatch error reply
508 */
509void
510svcerr_progvers(SVCXPRT *xprt, rpcvers_t low_vers, rpcvers_t high_vers)
511{
512	struct rpc_msg rply;
513
514	assert(xprt != NULL);
515
516	rply.rm_direction = REPLY;
517	rply.rm_reply.rp_stat = MSG_ACCEPTED;
518	rply.acpted_rply.ar_verf = xprt->xp_verf;
519	rply.acpted_rply.ar_stat = PROG_MISMATCH;
520	rply.acpted_rply.ar_vers.low = (u_int32_t)low_vers;
521	rply.acpted_rply.ar_vers.high = (u_int32_t)high_vers;
522	SVC_REPLY(xprt, &rply);
523}
524
525/*
526 * Allocate a new server transport structure. All fields are
527 * initialized to zero and xp_p3 is initialized to point at an
528 * extension structure to hold various flags and authentication
529 * parameters.
530 */
531SVCXPRT *
532svc_xprt_alloc(void)
533{
534	SVCXPRT *xprt;
535	SVCXPRT_EXT *ext;
536
537	xprt = mem_alloc(sizeof(SVCXPRT));
538	if (xprt == NULL)
539		return (NULL);
540	memset(xprt, 0, sizeof(SVCXPRT));
541	ext = mem_alloc(sizeof(SVCXPRT_EXT));
542	if (ext == NULL) {
543		mem_free(xprt, sizeof(SVCXPRT));
544		return (NULL);
545	}
546	memset(ext, 0, sizeof(SVCXPRT_EXT));
547	xprt->xp_p3 = ext;
548	ext->xp_auth.svc_ah_ops = &svc_auth_null_ops;
549
550	return (xprt);
551}
552
553/*
554 * Free a server transport structure.
555 */
556void
557svc_xprt_free(SVCXPRT *xprt)
558{
559
560	mem_free(xprt->xp_p3, sizeof(SVCXPRT_EXT));
561	mem_free(xprt, sizeof(SVCXPRT));
562}
563
564/* ******************* SERVER INPUT STUFF ******************* */
565
566/*
567 * Get server side input from some transport.
568 *
569 * Statement of authentication parameters management:
570 * This function owns and manages all authentication parameters, specifically
571 * the "raw" parameters (msg.rm_call.cb_cred and msg.rm_call.cb_verf) and
572 * the "cooked" credentials (rqst->rq_clntcred).
573 * However, this function does not know the structure of the cooked
574 * credentials, so it make the following assumptions:
575 *   a) the structure is contiguous (no pointers), and
576 *   b) the cred structure size does not exceed RQCRED_SIZE bytes.
577 * In all events, all three parameters are freed upon exit from this routine.
578 * The storage is trivially management on the call stack in user land, but
579 * is mallocated in kernel land.
580 */
581
582void
583svc_getreq(int rdfds)
584{
585	fd_set readfds;
586
587	FD_ZERO(&readfds);
588	readfds.fds_bits[0] = rdfds;
589	svc_getreqset(&readfds);
590}
591
592void
593svc_getreqset(fd_set *readfds)
594{
595	int bit, fd;
596	fd_mask mask, *maskp;
597	int sock;
598
599	assert(readfds != NULL);
600
601	maskp = readfds->fds_bits;
602	for (sock = 0; sock < FD_SETSIZE; sock += NFDBITS) {
603	    for (mask = *maskp++; (bit = ffsl(mask)) != 0;
604		mask ^= (1ul << (bit - 1))) {
605		/* sock has input waiting */
606		fd = sock + bit - 1;
607		svc_getreq_common(fd);
608	    }
609	}
610}
611
612void
613svc_getreq_common(int fd)
614{
615	SVCXPRT *xprt;
616	struct svc_req r;
617	struct rpc_msg msg;
618	int prog_found;
619	rpcvers_t low_vers;
620	rpcvers_t high_vers;
621	enum xprt_stat stat;
622	char cred_area[2*MAX_AUTH_BYTES + RQCRED_SIZE];
623
624	msg.rm_call.cb_cred.oa_base = cred_area;
625	msg.rm_call.cb_verf.oa_base = &(cred_area[MAX_AUTH_BYTES]);
626	r.rq_clntcred = &(cred_area[2*MAX_AUTH_BYTES]);
627
628	rwlock_rdlock(&svc_fd_lock);
629	xprt = __svc_xports[fd];
630	rwlock_unlock(&svc_fd_lock);
631	if (xprt == NULL)
632		/* But do we control sock? */
633		return;
634	/* now receive msgs from xprtprt (support batch calls) */
635	do {
636		if (SVC_RECV(xprt, &msg)) {
637
638			/* now find the exported program and call it */
639			struct svc_callout *s;
640			enum auth_stat why;
641
642			r.rq_xprt = xprt;
643			r.rq_prog = msg.rm_call.cb_prog;
644			r.rq_vers = msg.rm_call.cb_vers;
645			r.rq_proc = msg.rm_call.cb_proc;
646			r.rq_cred = msg.rm_call.cb_cred;
647			/* first authenticate the message */
648			if ((why = _authenticate(&r, &msg)) != AUTH_OK) {
649				/*
650				 * RPCSEC_GSS uses this return code
651				 * for requests that form part of its
652				 * context establishment protocol and
653				 * should not be dispatched to the
654				 * application.
655				 */
656				if (why != RPCSEC_GSS_NODISPATCH)
657					svcerr_auth(xprt, why);
658				goto call_done;
659			}
660			/* now match message with a registered service*/
661			prog_found = FALSE;
662			low_vers = (rpcvers_t) -1L;
663			high_vers = (rpcvers_t) 0L;
664			for (s = svc_head; s != NULL; s = s->sc_next) {
665				if (s->sc_prog == r.rq_prog) {
666					if (s->sc_vers == r.rq_vers) {
667						(*s->sc_dispatch)(&r, xprt);
668						goto call_done;
669					}  /* found correct version */
670					prog_found = TRUE;
671					if (s->sc_vers < low_vers)
672						low_vers = s->sc_vers;
673					if (s->sc_vers > high_vers)
674						high_vers = s->sc_vers;
675				}   /* found correct program */
676			}
677			/*
678			 * if we got here, the program or version
679			 * is not served ...
680			 */
681			if (prog_found)
682				svcerr_progvers(xprt, low_vers, high_vers);
683			else
684				svcerr_noprog(xprt);
685			/* Fall through to ... */
686		}
687		/*
688		 * Check if the xprt has been disconnected in a
689		 * recursive call in the service dispatch routine.
690		 * If so, then break.
691		 */
692		rwlock_rdlock(&svc_fd_lock);
693		if (xprt != __svc_xports[fd]) {
694			rwlock_unlock(&svc_fd_lock);
695			break;
696		}
697		rwlock_unlock(&svc_fd_lock);
698call_done:
699		if ((stat = SVC_STAT(xprt)) == XPRT_DIED){
700			SVC_DESTROY(xprt);
701			break;
702		}
703	} while (stat == XPRT_MOREREQS);
704}
705
706
707void
708svc_getreq_poll(struct pollfd *pfdp, int pollretval)
709{
710	int i;
711	int fds_found;
712
713	for (i = fds_found = 0; fds_found < pollretval; i++) {
714		struct pollfd *p = &pfdp[i];
715
716		if (p->revents) {
717			/* fd has input waiting */
718			fds_found++;
719			/*
720			 *	We assume that this function is only called
721			 *	via someone _select()ing from svc_fdset or
722			 *	_poll()ing from svc_pollset[].  Thus it's safe
723			 *	to handle the POLLNVAL event by simply turning
724			 *	the corresponding bit off in svc_fdset.  The
725			 *	svc_pollset[] array is derived from svc_fdset
726			 *	and so will also be updated eventually.
727			 *
728			 *	XXX Should we do an xprt_unregister() instead?
729			 */
730			if (p->revents & POLLNVAL) {
731				rwlock_wrlock(&svc_fd_lock);
732				FD_CLR(p->fd, &svc_fdset);
733				rwlock_unlock(&svc_fd_lock);
734			} else
735				svc_getreq_common(p->fd);
736		}
737	}
738}
739
740bool_t
741rpc_control(int what, void *arg)
742{
743	int val;
744
745	switch (what) {
746	case RPC_SVC_CONNMAXREC_SET:
747		val = *(int *)arg;
748		if (val <= 0)
749			return FALSE;
750		__svc_maxrec = val;
751		return TRUE;
752	case RPC_SVC_CONNMAXREC_GET:
753		*(int *)arg = __svc_maxrec;
754		return TRUE;
755	default:
756		break;
757	}
758	return FALSE;
759}
760