1 /* $NetBSD: clnt_dg.c,v 1.4 2000/07/14 08:40:41 fvdl Exp $ */
4 * SPDX-License-Identifier: BSD-3-Clause
6 * Copyright (c) 2009, Sun Microsystems, Inc.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 * - Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 * - Redistributions in binary form must reproduce the above copyright notice,
14 * this list of conditions and the following disclaimer in the documentation
15 * and/or other materials provided with the distribution.
16 * - Neither the name of Sun Microsystems, Inc. nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
33 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
36 #if defined(LIBC_SCCS) && !defined(lint)
37 #ident "@(#)clnt_dg.c 1.23 94/04/22 SMI"
38 static char sccsid[] = "@(#)clnt_dg.c 1.19 89/03/16 Copyr 1988 Sun Micro";
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
44 * Implements a connectionless client side RPC.
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
51 #include <sys/malloc.h>
53 #include <sys/mutex.h>
56 #include <sys/socket.h>
57 #include <sys/socketvar.h>
64 #include <rpc/rpc_com.h>
67 #ifdef _FREEFALL_CONFIG
69 * Disable RPC exponential back-off for FreeBSD.org systems.
71 #define RPC_MAX_BACKOFF 1 /* second */
73 #define RPC_MAX_BACKOFF 30 /* seconds */
76 static bool_t time_not_ok(struct timeval *);
77 static enum clnt_stat clnt_dg_call(CLIENT *, struct rpc_callextra *,
78 rpcproc_t, struct mbuf *, struct mbuf **, struct timeval);
79 static void clnt_dg_geterr(CLIENT *, struct rpc_err *);
80 static bool_t clnt_dg_freeres(CLIENT *, xdrproc_t, void *);
81 static void clnt_dg_abort(CLIENT *);
82 static bool_t clnt_dg_control(CLIENT *, u_int, void *);
83 static void clnt_dg_close(CLIENT *);
84 static void clnt_dg_destroy(CLIENT *);
85 static int clnt_dg_soupcall(struct socket *so, void *arg, int waitflag);
87 static struct clnt_ops clnt_dg_ops = {
88 .cl_call = clnt_dg_call,
89 .cl_abort = clnt_dg_abort,
90 .cl_geterr = clnt_dg_geterr,
91 .cl_freeres = clnt_dg_freeres,
92 .cl_close = clnt_dg_close,
93 .cl_destroy = clnt_dg_destroy,
94 .cl_control = clnt_dg_control
98 * A pending RPC request which awaits a reply. Requests which have
99 * received their reply will have cr_xid set to zero and cr_mrep to
100 * the mbuf chain of the reply.
103 TAILQ_ENTRY(cu_request) cr_link;
104 CLIENT *cr_client; /* owner */
105 uint32_t cr_xid; /* XID of request */
106 struct mbuf *cr_mrep; /* reply received by upcall */
107 int cr_error; /* any error from upcall */
108 char cr_verf[MAX_AUTH_BYTES]; /* reply verf */
111 TAILQ_HEAD(cu_request_list, cu_request);
113 #define MCALL_MSG_SIZE 24
116 * This structure is pointed to by the socket buffer's sb_upcallarg
117 * member. It is separate from the client private data to facilitate
118 * multiple clients sharing the same socket. The cs_lock mutex is used
119 * to protect all fields of this structure, the socket's receive
120 * buffer SOCKBUF_LOCK is used to ensure that exactly one of these
121 * structures is installed on the socket.
125 int cs_refs; /* Count of clients */
126 struct cu_request_list cs_pending; /* Requests awaiting replies */
127 int cs_upcallrefs; /* Refcnt of upcalls in prog.*/
130 static void clnt_dg_upcallsdone(struct socket *, struct cu_socket *);
133 * Private data kept per client handle
136 int cu_threads; /* # threads in clnt_vc_call */
137 bool_t cu_closing; /* TRUE if we are closing */
138 bool_t cu_closed; /* TRUE if we are closed */
139 struct socket *cu_socket; /* connection socket */
140 bool_t cu_closeit; /* opened by library */
141 struct sockaddr_storage cu_raddr; /* remote address */
143 struct timeval cu_wait; /* retransmit interval */
144 struct timeval cu_total; /* total time for the call */
145 struct rpc_err cu_error;
147 char cu_mcallc[MCALL_MSG_SIZE]; /* marshalled callmsg */
149 size_t cu_sendsz; /* send size */
150 size_t cu_recvsz; /* recv size */
152 int cu_connect; /* Use connect(). */
153 int cu_connected; /* Have done connect(). */
154 const char *cu_waitchan;
156 int cu_cwnd; /* congestion window */
157 int cu_sent; /* number of in-flight RPCs */
161 #define CWNDSCALE 256
162 #define MAXCWND (32 * CWNDSCALE)
165 * Connection less client creation returns with client handle parameters.
166 * Default options are set, which the user can change using clnt_control().
167 * fd should be open and bound.
168 * NB: The rpch->cl_auth is initialized to null authentication.
169 * Caller may wish to set this something more useful.
171 * sendsz and recvsz are the maximum allowable packet sizes that can be
172 * sent and received. Normally they are the same, but they can be
173 * changed to improve the program efficiency and buffer allocation.
174 * If they are 0, use the transport default.
176 * If svcaddr is NULL, returns NULL.
181 struct sockaddr *svcaddr, /* servers address */
182 rpcprog_t program, /* program number */
183 rpcvers_t version, /* version number */
184 size_t sendsz, /* buffer recv size */
185 size_t recvsz) /* buffer send size */
187 CLIENT *cl = NULL; /* client handle */
188 struct cu_data *cu = NULL; /* private data */
189 struct cu_socket *cs = NULL;
192 struct rpc_msg call_msg;
193 struct __rpc_sockinfo si;
197 if (svcaddr == NULL) {
198 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
202 if (!__rpc_socket2sockinfo(so, &si)) {
203 rpc_createerr.cf_stat = RPC_TLIERROR;
204 rpc_createerr.cf_error.re_errno = 0;
209 * Find the receive and the send size
211 sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz);
212 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz);
213 if ((sendsz == 0) || (recvsz == 0)) {
214 rpc_createerr.cf_stat = RPC_TLIERROR; /* XXX */
215 rpc_createerr.cf_error.re_errno = 0;
219 cl = mem_alloc(sizeof (CLIENT));
222 * Should be multiple of 4 for XDR.
224 sendsz = rounddown(sendsz + 3, 4);
225 recvsz = rounddown(recvsz + 3, 4);
226 cu = mem_alloc(sizeof (*cu));
228 cu->cu_closing = FALSE;
229 cu->cu_closed = FALSE;
230 (void) memcpy(&cu->cu_raddr, svcaddr, (size_t)svcaddr->sa_len);
231 cu->cu_rlen = svcaddr->sa_len;
232 /* Other values can also be set through clnt_control() */
233 cu->cu_wait.tv_sec = 3; /* heuristically chosen */
234 cu->cu_wait.tv_usec = 0;
235 cu->cu_total.tv_sec = -1;
236 cu->cu_total.tv_usec = -1;
237 cu->cu_sendsz = sendsz;
238 cu->cu_recvsz = recvsz;
239 cu->cu_async = FALSE;
240 cu->cu_connect = FALSE;
241 cu->cu_connected = FALSE;
242 cu->cu_waitchan = "rpcrecv";
244 cu->cu_cwnd = MAXCWND / 2;
246 cu->cu_cwnd_wait = FALSE;
247 (void) getmicrotime(&now);
248 cu->cu_xid = __RPC_GETXID(&now);
249 call_msg.rm_xid = cu->cu_xid;
250 call_msg.rm_call.cb_prog = program;
251 call_msg.rm_call.cb_vers = version;
252 xdrmem_create(&xdrs, cu->cu_mcallc, MCALL_MSG_SIZE, XDR_ENCODE);
253 if (! xdr_callhdr(&xdrs, &call_msg)) {
254 rpc_createerr.cf_stat = RPC_CANTENCODEARGS; /* XXX */
255 rpc_createerr.cf_error.re_errno = 0;
258 cu->cu_mcalllen = XDR_GETPOS(&xdrs);
261 * By default, closeit is always FALSE. It is users responsibility
262 * to do a close on it, else the user may use clnt_control
263 * to let clnt_destroy do it for him/her.
265 cu->cu_closeit = FALSE;
267 error = soreserve(so, (u_long)sendsz, (u_long)recvsz);
269 rpc_createerr.cf_stat = RPC_FAILED;
270 rpc_createerr.cf_error.re_errno = error;
275 SOCKBUF_LOCK(&so->so_rcv);
278 if (sb->sb_upcall != clnt_dg_soupcall) {
279 SOCKBUF_UNLOCK(&so->so_rcv);
280 printf("clnt_dg_create(): socket already has an incompatible upcall\n");
283 cs = (struct cu_socket *) sb->sb_upcallarg;
284 mtx_lock(&cs->cs_lock);
286 mtx_unlock(&cs->cs_lock);
289 * We are the first on this socket - allocate the
290 * structure and install it in the socket.
292 SOCKBUF_UNLOCK(&so->so_rcv);
293 cs = mem_alloc(sizeof(*cs));
294 SOCKBUF_LOCK(&so->so_rcv);
297 * We have lost a race with some other client.
299 mem_free(cs, sizeof(*cs));
302 mtx_init(&cs->cs_lock, "cs->cs_lock", NULL, MTX_DEF);
304 cs->cs_upcallrefs = 0;
305 TAILQ_INIT(&cs->cs_pending);
306 soupcall_set(so, SO_RCV, clnt_dg_soupcall, cs);
308 SOCKBUF_UNLOCK(&so->so_rcv);
311 cl->cl_ops = &clnt_dg_ops;
312 cl->cl_private = (caddr_t)(void *)cu;
313 cl->cl_auth = authnone_create();
318 mem_free(cl, sizeof (CLIENT));
319 mem_free(cu, sizeof (*cu));
324 static enum clnt_stat
326 CLIENT *cl, /* client handle */
327 struct rpc_callextra *ext, /* call metadata */
328 rpcproc_t proc, /* procedure number */
329 struct mbuf *args, /* pointer to args */
330 struct mbuf **resultsp, /* pointer to results */
331 struct timeval utimeout) /* seconds to wait before giving up */
333 struct cu_data *cu = (struct cu_data *)cl->cl_private;
334 struct cu_socket *cs;
335 struct rpc_timers *rt;
337 struct rpc_err *errp;
340 struct rpc_msg reply_msg;
342 int retrans; /* number of re-transmits so far */
343 int nrefreshes = 2; /* number of times to refresh cred */
347 int next_sendtime, starttime, rtt, time_waited, tv = 0;
351 struct mbuf *mreq = NULL, *results;
352 struct cu_request *cr;
355 cs = cu->cu_socket->so_rcv.sb_upcallarg;
356 cr = malloc(sizeof(struct cu_request), M_RPC, M_WAITOK);
358 mtx_lock(&cs->cs_lock);
360 if (cu->cu_closing || cu->cu_closed) {
361 mtx_unlock(&cs->cs_lock);
363 return (RPC_CANTSEND);
372 errp = &cu->cu_error;
379 if (cu->cu_total.tv_usec == -1) {
380 tvp = &utimeout; /* use supplied timeout */
382 tvp = &cu->cu_total; /* use default timeout */
384 if (tvp->tv_sec || tvp->tv_usec)
385 timeout = tvtohz(tvp);
389 if (cu->cu_connect && !cu->cu_connected) {
390 mtx_unlock(&cs->cs_lock);
391 error = soconnect(cu->cu_socket,
392 (struct sockaddr *)&cu->cu_raddr, curthread);
393 mtx_lock(&cs->cs_lock);
395 errp->re_errno = error;
396 errp->re_status = stat = RPC_CANTSEND;
399 cu->cu_connected = 1;
401 if (cu->cu_connected) {
405 sa = (struct sockaddr *)&cu->cu_raddr;
410 if (ext && ext->rc_timers) {
413 rt->rt_rtxcur = tvtohz(&cu->cu_wait);
414 retransmit_time = next_sendtime = rt->rt_rtxcur;
417 retransmit_time = next_sendtime = tvtohz(&cu->cu_wait);
423 mtx_assert(&cs->cs_lock, MA_OWNED);
429 mtx_unlock(&cs->cs_lock);
431 mreq = m_gethdr(M_WAITOK, MT_DATA);
432 KASSERT(cu->cu_mcalllen <= MHLEN, ("RPC header too big"));
433 bcopy(cu->cu_mcallc, mreq->m_data, cu->cu_mcalllen);
434 mreq->m_len = cu->cu_mcalllen;
437 * The XID is the first thing in the request.
439 *mtod(mreq, uint32_t *) = htonl(xid);
441 xdrmbuf_create(&xdrs, mreq, XDR_ENCODE);
443 if (cu->cu_async == TRUE && args == NULL)
446 if ((! XDR_PUTINT32(&xdrs, &proc)) ||
447 (! AUTH_MARSHALL(auth, xid, &xdrs,
448 m_copym(args, 0, M_COPYALL, M_WAITOK)))) {
449 errp->re_status = stat = RPC_CANTENCODEARGS;
450 mtx_lock(&cs->cs_lock);
453 mreq->m_pkthdr.len = m_length(mreq, NULL);
456 mtx_lock(&cs->cs_lock);
459 * Try to get a place in the congestion window.
461 while (cu->cu_sent >= cu->cu_cwnd) {
462 cu->cu_cwnd_wait = TRUE;
463 error = msleep(&cu->cu_cwnd_wait, &cs->cs_lock,
464 cu->cu_waitflag, "rpccwnd", 0);
466 errp->re_errno = error;
467 if (error == EINTR || error == ERESTART)
468 errp->re_status = stat = RPC_INTR;
470 errp->re_status = stat = RPC_CANTSEND;
474 cu->cu_sent += CWNDSCALE;
476 TAILQ_INSERT_TAIL(&cs->cs_pending, cr, cr_link);
477 mtx_unlock(&cs->cs_lock);
480 * sosend consumes mreq.
482 error = sosend(cu->cu_socket, sa, NULL, mreq, NULL, 0, curthread);
486 * sub-optimal code appears here because we have
487 * some clock time to spare while the packets are in flight.
488 * (We assume that this is actually only executed once.)
490 reply_msg.acpted_rply.ar_verf.oa_flavor = AUTH_NULL;
491 reply_msg.acpted_rply.ar_verf.oa_base = cr->cr_verf;
492 reply_msg.acpted_rply.ar_verf.oa_length = 0;
493 reply_msg.acpted_rply.ar_results.where = NULL;
494 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
496 mtx_lock(&cs->cs_lock);
498 TAILQ_REMOVE(&cs->cs_pending, cr, cr_link);
499 errp->re_errno = error;
500 errp->re_status = stat = RPC_CANTSEND;
501 cu->cu_sent -= CWNDSCALE;
502 if (cu->cu_cwnd_wait) {
503 cu->cu_cwnd_wait = FALSE;
504 wakeup(&cu->cu_cwnd_wait);
510 * Check to see if we got an upcall while waiting for the
514 TAILQ_REMOVE(&cs->cs_pending, cr, cr_link);
515 errp->re_errno = cr->cr_error;
516 errp->re_status = stat = RPC_CANTRECV;
517 cu->cu_sent -= CWNDSCALE;
518 if (cu->cu_cwnd_wait) {
519 cu->cu_cwnd_wait = FALSE;
520 wakeup(&cu->cu_cwnd_wait);
525 TAILQ_REMOVE(&cs->cs_pending, cr, cr_link);
526 cu->cu_sent -= CWNDSCALE;
527 if (cu->cu_cwnd_wait) {
528 cu->cu_cwnd_wait = FALSE;
529 wakeup(&cu->cu_cwnd_wait);
535 * Hack to provide rpc-based message passing
538 TAILQ_REMOVE(&cs->cs_pending, cr, cr_link);
539 errp->re_status = stat = RPC_TIMEDOUT;
540 cu->cu_sent -= CWNDSCALE;
541 if (cu->cu_cwnd_wait) {
542 cu->cu_cwnd_wait = FALSE;
543 wakeup(&cu->cu_cwnd_wait);
550 /* Decide how long to wait. */
551 if (next_sendtime < timeout)
558 if (cu->cu_closing || cu->cu_closed) {
560 cr->cr_error = ESHUTDOWN;
562 error = msleep(cr, &cs->cs_lock,
563 cu->cu_waitflag, cu->cu_waitchan, tv);
569 TAILQ_REMOVE(&cs->cs_pending, cr, cr_link);
570 cu->cu_sent -= CWNDSCALE;
571 if (cu->cu_cwnd_wait) {
572 cu->cu_cwnd_wait = FALSE;
573 wakeup(&cu->cu_cwnd_wait);
578 * We were woken up by the upcall. If the
579 * upcall had a receive error, report that,
580 * otherwise we have a reply.
583 errp->re_errno = cr->cr_error;
584 errp->re_status = stat = RPC_CANTRECV;
588 cu->cu_cwnd += (CWNDSCALE * CWNDSCALE
589 + cu->cu_cwnd / 2) / cu->cu_cwnd;
590 if (cu->cu_cwnd > MAXCWND)
591 cu->cu_cwnd = MAXCWND;
595 * Add one to the time since a tick
596 * count of N means that the actual
597 * time taken was somewhere between N
600 rtt = ticks - starttime + 1;
603 * Update our estimate of the round
604 * trip time using roughly the
605 * algorithm described in RFC
606 * 2988. Given an RTT sample R:
608 * RTTVAR = (1-beta) * RTTVAR + beta * |SRTT-R|
609 * SRTT = (1-alpha) * SRTT + alpha * R
611 * where alpha = 0.125 and beta = 0.25.
613 * The initial retransmit timeout is
614 * SRTT + 4*RTTVAR and doubles on each
617 if (rt->rt_srtt == 0) {
619 rt->rt_deviate = rtt / 2;
621 int32_t error = rtt - rt->rt_srtt;
622 rt->rt_srtt += error / 8;
623 error = abs(error) - rt->rt_deviate;
624 rt->rt_deviate += error / 4;
626 rt->rt_rtxcur = rt->rt_srtt + 4*rt->rt_deviate;
633 * The sleep returned an error so our request is still
634 * on the list. If we got EWOULDBLOCK, we may want to
635 * re-send the request.
637 if (error != EWOULDBLOCK) {
638 errp->re_errno = error;
639 if (error == EINTR || error == ERESTART)
640 errp->re_status = stat = RPC_INTR;
642 errp->re_status = stat = RPC_CANTRECV;
646 time_waited = ticks - starttime;
648 /* Check for timeout. */
649 if (time_waited > timeout) {
650 errp->re_errno = EWOULDBLOCK;
651 errp->re_status = stat = RPC_TIMEDOUT;
655 /* Retransmit if necessary. */
656 if (time_waited >= next_sendtime) {
658 if (cu->cu_cwnd < CWNDSCALE)
659 cu->cu_cwnd = CWNDSCALE;
660 if (ext && ext->rc_feedback) {
661 mtx_unlock(&cs->cs_lock);
663 ext->rc_feedback(FEEDBACK_REXMIT1,
664 proc, ext->rc_feedback_arg);
666 ext->rc_feedback(FEEDBACK_REXMIT2,
667 proc, ext->rc_feedback_arg);
668 mtx_lock(&cs->cs_lock);
670 if (cu->cu_closing || cu->cu_closed) {
671 errp->re_errno = ESHUTDOWN;
672 errp->re_status = stat = RPC_CANTRECV;
676 /* update retransmit_time */
677 if (retransmit_time < RPC_MAX_BACKOFF * hz)
678 retransmit_time = 2 * retransmit_time;
679 next_sendtime += retransmit_time;
682 cu->cu_sent += CWNDSCALE;
683 TAILQ_INSERT_TAIL(&cs->cs_pending, cr, cr_link);
688 * Now decode and validate the response. We need to drop the
689 * lock since xdr_replymsg may end up sleeping in malloc.
691 mtx_unlock(&cs->cs_lock);
693 if (ext && ext->rc_feedback)
694 ext->rc_feedback(FEEDBACK_OK, proc, ext->rc_feedback_arg);
696 xdrmbuf_create(&xdrs, cr->cr_mrep, XDR_DECODE);
697 ok = xdr_replymsg(&xdrs, &reply_msg);
701 if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
702 (reply_msg.acpted_rply.ar_stat == SUCCESS))
703 errp->re_status = stat = RPC_SUCCESS;
705 stat = _seterr_reply(&reply_msg, &(cu->cu_error));
707 if (errp->re_status == RPC_SUCCESS) {
708 results = xdrmbuf_getall(&xdrs);
709 if (! AUTH_VALIDATE(auth, xid,
710 &reply_msg.acpted_rply.ar_verf,
712 errp->re_status = stat = RPC_AUTHERROR;
713 errp->re_why = AUTH_INVALIDRESP;
715 auth->ah_cred.oa_flavor == RPCSEC_GSS) {
717 * If we retransmitted, its
718 * possible that we will
719 * receive a reply for one of
720 * the earlier transmissions
721 * (which will use an older
722 * RPCSEC_GSS sequence
723 * number). In this case, just
724 * go back and listen for a
725 * new reply. We could keep a
726 * record of all the seq
727 * numbers we have transmitted
728 * so far so that we could
729 * accept a reply for any of
733 mtx_lock(&cs->cs_lock);
734 cu->cu_sent += CWNDSCALE;
735 TAILQ_INSERT_TAIL(&cs->cs_pending,
743 } /* end successful completion */
745 * If unsuccessful AND error is an authentication error
746 * then refresh credentials and try again, else break
748 else if (stat == RPC_AUTHERROR)
749 /* maybe our credentials need to be refreshed ... */
750 if (nrefreshes > 0 &&
751 AUTH_REFRESH(auth, &reply_msg)) {
754 mtx_lock(&cs->cs_lock);
757 /* end of unsuccessful completion */
758 } /* end of valid reply message */
760 errp->re_status = stat = RPC_CANTDECODERES;
764 mtx_lock(&cs->cs_lock);
766 mtx_assert(&cs->cs_lock, MA_OWNED);
771 m_freem(cr->cr_mrep);
777 mtx_unlock(&cs->cs_lock);
779 if (auth && stat != RPC_SUCCESS)
780 AUTH_VALIDATE(auth, xid, NULL, NULL);
788 clnt_dg_geterr(CLIENT *cl, struct rpc_err *errp)
790 struct cu_data *cu = (struct cu_data *)cl->cl_private;
792 *errp = cu->cu_error;
796 clnt_dg_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr)
801 xdrs.x_op = XDR_FREE;
802 dummy = (*xdr_res)(&xdrs, res_ptr);
809 clnt_dg_abort(CLIENT *h)
814 clnt_dg_control(CLIENT *cl, u_int request, void *info)
816 struct cu_data *cu = (struct cu_data *)cl->cl_private;
817 struct cu_socket *cs;
818 struct sockaddr *addr;
820 cs = cu->cu_socket->so_rcv.sb_upcallarg;
821 mtx_lock(&cs->cs_lock);
825 cu->cu_closeit = TRUE;
826 mtx_unlock(&cs->cs_lock);
828 case CLSET_FD_NCLOSE:
829 cu->cu_closeit = FALSE;
830 mtx_unlock(&cs->cs_lock);
834 /* for other requests which use info */
836 mtx_unlock(&cs->cs_lock);
841 if (time_not_ok((struct timeval *)info)) {
842 mtx_unlock(&cs->cs_lock);
845 cu->cu_total = *(struct timeval *)info;
848 *(struct timeval *)info = cu->cu_total;
850 case CLSET_RETRY_TIMEOUT:
851 if (time_not_ok((struct timeval *)info)) {
852 mtx_unlock(&cs->cs_lock);
855 cu->cu_wait = *(struct timeval *)info;
857 case CLGET_RETRY_TIMEOUT:
858 *(struct timeval *)info = cu->cu_wait;
862 * Slightly different semantics to userland - we use
863 * sockaddr instead of netbuf.
865 memcpy(info, &cu->cu_raddr, cu->cu_raddr.ss_len);
867 case CLSET_SVC_ADDR: /* set to new address */
868 addr = (struct sockaddr *)info;
869 (void) memcpy(&cu->cu_raddr, addr, addr->sa_len);
872 *(uint32_t *)info = cu->cu_xid;
876 /* This will set the xid of the NEXT call */
877 /* decrement by 1 as clnt_dg_call() increments once */
878 cu->cu_xid = *(uint32_t *)info - 1;
883 * This RELIES on the information that, in the call body,
884 * the version number field is the fifth field from the
885 * beginning of the RPC header. MUST be changed if the
886 * call_struct is changed
889 ntohl(*(uint32_t *)(void *)(cu->cu_mcallc +
890 4 * BYTES_PER_XDR_UNIT));
894 *(uint32_t *)(void *)(cu->cu_mcallc + 4 * BYTES_PER_XDR_UNIT)
895 = htonl(*(uint32_t *)info);
900 * This RELIES on the information that, in the call body,
901 * the program number field is the fourth field from the
902 * beginning of the RPC header. MUST be changed if the
903 * call_struct is changed
906 ntohl(*(uint32_t *)(void *)(cu->cu_mcallc +
907 3 * BYTES_PER_XDR_UNIT));
911 *(uint32_t *)(void *)(cu->cu_mcallc + 3 * BYTES_PER_XDR_UNIT)
912 = htonl(*(uint32_t *)info);
915 cu->cu_async = *(int *)info;
918 cu->cu_connect = *(int *)info;
921 cu->cu_waitchan = (const char *)info;
924 *(const char **) info = cu->cu_waitchan;
926 case CLSET_INTERRUPTIBLE:
928 cu->cu_waitflag = PCATCH;
932 case CLGET_INTERRUPTIBLE:
934 *(int *) info = TRUE;
936 *(int *) info = FALSE;
939 mtx_unlock(&cs->cs_lock);
942 mtx_unlock(&cs->cs_lock);
947 clnt_dg_close(CLIENT *cl)
949 struct cu_data *cu = (struct cu_data *)cl->cl_private;
950 struct cu_socket *cs;
951 struct cu_request *cr;
953 cs = cu->cu_socket->so_rcv.sb_upcallarg;
954 mtx_lock(&cs->cs_lock);
957 mtx_unlock(&cs->cs_lock);
961 if (cu->cu_closing) {
962 while (cu->cu_closing)
963 msleep(cu, &cs->cs_lock, 0, "rpcclose", 0);
964 KASSERT(cu->cu_closed, ("client should be closed"));
965 mtx_unlock(&cs->cs_lock);
970 * Abort any pending requests and wait until everyone
971 * has finished with clnt_vc_call.
973 cu->cu_closing = TRUE;
974 TAILQ_FOREACH(cr, &cs->cs_pending, cr_link) {
975 if (cr->cr_client == cl) {
977 cr->cr_error = ESHUTDOWN;
982 while (cu->cu_threads)
983 msleep(cu, &cs->cs_lock, 0, "rpcclose", 0);
985 cu->cu_closing = FALSE;
986 cu->cu_closed = TRUE;
988 mtx_unlock(&cs->cs_lock);
993 clnt_dg_destroy(CLIENT *cl)
995 struct cu_data *cu = (struct cu_data *)cl->cl_private;
996 struct cu_socket *cs;
997 struct socket *so = NULL;
998 bool_t lastsocketref;
1000 cs = cu->cu_socket->so_rcv.sb_upcallarg;
1003 SOCKBUF_LOCK(&cu->cu_socket->so_rcv);
1004 mtx_lock(&cs->cs_lock);
1007 if (cs->cs_refs == 0) {
1008 mtx_unlock(&cs->cs_lock);
1009 soupcall_clear(cu->cu_socket, SO_RCV);
1010 clnt_dg_upcallsdone(cu->cu_socket, cs);
1011 SOCKBUF_UNLOCK(&cu->cu_socket->so_rcv);
1012 mtx_destroy(&cs->cs_lock);
1013 mem_free(cs, sizeof(*cs));
1014 lastsocketref = TRUE;
1016 mtx_unlock(&cs->cs_lock);
1017 SOCKBUF_UNLOCK(&cu->cu_socket->so_rcv);
1018 lastsocketref = FALSE;
1021 if (cu->cu_closeit && lastsocketref) {
1023 cu->cu_socket = NULL;
1029 if (cl->cl_netid && cl->cl_netid[0])
1030 mem_free(cl->cl_netid, strlen(cl->cl_netid) +1);
1031 if (cl->cl_tp && cl->cl_tp[0])
1032 mem_free(cl->cl_tp, strlen(cl->cl_tp) +1);
1033 mem_free(cu, sizeof (*cu));
1034 mem_free(cl, sizeof (CLIENT));
1038 * Make sure that the time is not garbage. -1 value is allowed.
1041 time_not_ok(struct timeval *t)
1043 return (t->tv_sec < -1 || t->tv_sec > 100000000 ||
1044 t->tv_usec < -1 || t->tv_usec > 1000000);
1048 clnt_dg_soupcall(struct socket *so, void *arg, int waitflag)
1050 struct cu_socket *cs = (struct cu_socket *) arg;
1053 struct mbuf *control;
1054 struct cu_request *cr;
1055 int error, rcvflag, foundreq;
1058 cs->cs_upcallrefs++;
1059 uio.uio_resid = 1000000000;
1060 uio.uio_td = curthread;
1062 SOCKBUF_UNLOCK(&so->so_rcv);
1065 rcvflag = MSG_DONTWAIT;
1066 error = soreceive(so, NULL, &uio, &m, &control, &rcvflag);
1069 SOCKBUF_LOCK(&so->so_rcv);
1071 if (error == EWOULDBLOCK)
1075 * If there was an error, wake up all pending
1079 mtx_lock(&cs->cs_lock);
1080 TAILQ_FOREACH(cr, &cs->cs_pending, cr_link) {
1082 cr->cr_error = error;
1085 mtx_unlock(&cs->cs_lock);
1090 * The XID is in the first uint32_t of the reply.
1092 if (m->m_len < sizeof(xid) && m_length(m, NULL) < sizeof(xid)) {
1094 * Should never happen.
1100 m_copydata(m, 0, sizeof(xid), (char *)&xid);
1104 * Attempt to match this reply with a pending request.
1106 mtx_lock(&cs->cs_lock);
1108 TAILQ_FOREACH(cr, &cs->cs_pending, cr_link) {
1109 if (cr->cr_xid == xid) {
1111 * This one matches. We leave the
1112 * reply mbuf in cr->cr_mrep. Set the
1113 * XID to zero so that we will ignore
1114 * any duplicated replies that arrive
1115 * before clnt_dg_call removes it from
1126 mtx_unlock(&cs->cs_lock);
1129 * If we didn't find the matching request, just drop
1130 * it - its probably a repeated reply.
1135 cs->cs_upcallrefs--;
1136 if (cs->cs_upcallrefs < 0)
1137 panic("rpcdg upcall refcnt");
1138 if (cs->cs_upcallrefs == 0)
1139 wakeup(&cs->cs_upcallrefs);
1144 * Wait for all upcalls in progress to complete.
1147 clnt_dg_upcallsdone(struct socket *so, struct cu_socket *cs)
1150 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1152 while (cs->cs_upcallrefs > 0)
1153 (void) msleep(&cs->cs_upcallrefs, SOCKBUF_MTX(&so->so_rcv), 0,