1 /* $NetBSD: clnt_vc.c,v 1.4 2000/07/14 08:40:42 fvdl Exp $ */
4 * Copyright (c) 2009, Sun Microsystems, Inc.
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.
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.
31 #if defined(LIBC_SCCS) && !defined(lint)
32 static char *sccsid2 = "@(#)clnt_tcp.c 1.37 87/10/05 Copyr 1984 Sun Micro";
33 static char *sccsid = "@(#)clnt_tcp.c 2.2 88/08/01 4.0 RPCSRC";
34 static char sccsid3[] = "@(#)clnt_vc.c 1.19 89/03/16 Copyr 1988 Sun Micro";
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
40 * clnt_tcp.c, Implements a TCP/IP based, client side RPC.
42 * Copyright (C) 1984, Sun Microsystems, Inc.
44 * TCP based RPC supports 'batched calls'.
45 * A sequence of calls may be batched-up in a send buffer. The rpc call
46 * return immediately to the client even though the call was not necessarily
47 * sent. The batching occurs if the results' xdr routine is NULL (0) AND
48 * the rpc timeout value is zero (see clnt.h, rpc).
50 * Clients should NOT casually batch calls that in fact return results; that is,
51 * the server side should be aware that a call is batched and not produce any
52 * return message. Batched calls that produce many result messages can
53 * deadlock (netlock) the client and the server....
55 * Now go hang yourself.
58 #include <sys/param.h>
59 #include <sys/systm.h>
61 #include <sys/malloc.h>
63 #include <sys/mutex.h>
66 #include <sys/protosw.h>
67 #include <sys/socket.h>
68 #include <sys/socketvar.h>
70 #include <sys/syslog.h>
76 #include <netinet/tcp.h>
79 #include <rpc/rpc_com.h>
84 struct cmsgcred cmcred;
87 static enum clnt_stat clnt_vc_call(CLIENT *, struct rpc_callextra *,
88 rpcproc_t, struct mbuf *, struct mbuf **, struct timeval);
89 static void clnt_vc_geterr(CLIENT *, struct rpc_err *);
90 static bool_t clnt_vc_freeres(CLIENT *, xdrproc_t, void *);
91 static void clnt_vc_abort(CLIENT *);
92 static bool_t clnt_vc_control(CLIENT *, u_int, void *);
93 static void clnt_vc_close(CLIENT *);
94 static void clnt_vc_destroy(CLIENT *);
95 static bool_t time_not_ok(struct timeval *);
96 static int clnt_vc_soupcall(struct socket *so, void *arg, int waitflag);
98 static struct clnt_ops clnt_vc_ops = {
99 .cl_call = clnt_vc_call,
100 .cl_abort = clnt_vc_abort,
101 .cl_geterr = clnt_vc_geterr,
102 .cl_freeres = clnt_vc_freeres,
103 .cl_close = clnt_vc_close,
104 .cl_destroy = clnt_vc_destroy,
105 .cl_control = clnt_vc_control
108 static void clnt_vc_upcallsdone(struct ct_data *);
111 * Create a client handle for a connection.
112 * Default options are set, which the user can change using clnt_control()'s.
113 * The rpc/vc package does buffering similar to stdio, so the client
114 * must pick send and receive buffer sizes, 0 => use the default.
115 * NB: fd is copied into a private area.
116 * NB: The rpch->cl_auth is set null authentication. Caller may wish to
117 * set this something more useful.
119 * fd should be an open socket
123 struct socket *so, /* open file descriptor */
124 struct sockaddr *raddr, /* servers address */
125 const rpcprog_t prog, /* program number */
126 const rpcvers_t vers, /* version number */
127 size_t sendsz, /* buffer recv size */
128 size_t recvsz, /* buffer send size */
129 int intrflag) /* interruptible */
131 CLIENT *cl; /* client handle */
132 struct ct_data *ct = NULL; /* client handle */
134 struct rpc_msg call_msg;
135 static uint32_t disrupt;
136 struct __rpc_sockinfo si;
138 int error, interrupted, one = 1, sleep_flag;
142 disrupt = (uint32_t)(long)raddr;
144 cl = (CLIENT *)mem_alloc(sizeof (*cl));
145 ct = (struct ct_data *)mem_alloc(sizeof (*ct));
147 mtx_init(&ct->ct_lock, "ct->ct_lock", NULL, MTX_DEF);
149 ct->ct_closing = FALSE;
150 ct->ct_closed = FALSE;
151 ct->ct_upcallrefs = 0;
153 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) {
154 error = soconnect(so, raddr, curthread);
159 sleep_flag |= PCATCH;
160 while ((so->so_state & SS_ISCONNECTING)
161 && so->so_error == 0) {
162 error = msleep(&so->so_timeo, SOCK_MTX(so),
163 sleep_flag, "connec", 0);
165 if (error == EINTR || error == ERESTART)
171 error = so->so_error;
177 so->so_state &= ~SS_ISCONNECTING;
178 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
179 rpc_createerr.cf_error.re_errno = error;
184 if (!__rpc_socket2sockinfo(so, &si)) {
188 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
189 bzero(&sopt, sizeof(sopt));
190 sopt.sopt_dir = SOPT_SET;
191 sopt.sopt_level = SOL_SOCKET;
192 sopt.sopt_name = SO_KEEPALIVE;
193 sopt.sopt_val = &one;
194 sopt.sopt_valsize = sizeof(one);
198 if (so->so_proto->pr_protocol == IPPROTO_TCP) {
199 bzero(&sopt, sizeof(sopt));
200 sopt.sopt_dir = SOPT_SET;
201 sopt.sopt_level = IPPROTO_TCP;
202 sopt.sopt_name = TCP_NODELAY;
203 sopt.sopt_val = &one;
204 sopt.sopt_valsize = sizeof(one);
208 ct->ct_closeit = FALSE;
211 * Set up private data struct
214 ct->ct_wait.tv_sec = -1;
215 ct->ct_wait.tv_usec = -1;
216 memcpy(&ct->ct_addr, raddr, raddr->sa_len);
219 * Initialize call message
222 ct->ct_xid = ((uint32_t)++disrupt) ^ __RPC_GETXID(&now);
223 call_msg.rm_xid = ct->ct_xid;
224 call_msg.rm_direction = CALL;
225 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
226 call_msg.rm_call.cb_prog = (uint32_t)prog;
227 call_msg.rm_call.cb_vers = (uint32_t)vers;
230 * pre-serialize the static part of the call msg and stash it away
232 xdrmem_create(&xdrs, ct->ct_mcallc, MCALL_MSG_SIZE,
234 if (! xdr_callhdr(&xdrs, &call_msg)) {
235 if (ct->ct_closeit) {
236 soclose(ct->ct_socket);
240 ct->ct_mpos = XDR_GETPOS(&xdrs);
242 ct->ct_waitchan = "rpcrecv";
246 * Create a client handle which uses xdrrec for serialization
247 * and authnone for authentication.
249 sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz);
250 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz);
251 error = soreserve(ct->ct_socket, sendsz, recvsz);
253 if (ct->ct_closeit) {
254 soclose(ct->ct_socket);
259 cl->cl_ops = &clnt_vc_ops;
261 cl->cl_auth = authnone_create();
263 SOCKBUF_LOCK(&ct->ct_socket->so_rcv);
264 soupcall_set(ct->ct_socket, SO_RCV, clnt_vc_soupcall, ct);
265 SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv);
267 ct->ct_record = NULL;
268 ct->ct_record_resid = 0;
269 TAILQ_INIT(&ct->ct_pending);
273 mtx_destroy(&ct->ct_lock);
274 mem_free(ct, sizeof (struct ct_data));
275 mem_free(cl, sizeof (CLIENT));
277 return ((CLIENT *)NULL);
280 static enum clnt_stat
282 CLIENT *cl, /* client handle */
283 struct rpc_callextra *ext, /* call metadata */
284 rpcproc_t proc, /* procedure number */
285 struct mbuf *args, /* pointer to args */
286 struct mbuf **resultsp, /* pointer to results */
287 struct timeval utimeout)
289 struct ct_data *ct = (struct ct_data *) cl->cl_private;
291 struct rpc_err *errp;
294 struct rpc_msg reply_msg;
296 int nrefreshes = 2; /* number of times to refresh cred */
297 struct timeval timeout;
299 struct mbuf *mreq = NULL, *results;
300 struct ct_request *cr;
303 cr = malloc(sizeof(struct ct_request), M_RPC, M_WAITOK);
305 mtx_lock(&ct->ct_lock);
307 if (ct->ct_closing || ct->ct_closed) {
308 mtx_unlock(&ct->ct_lock);
310 return (RPC_CANTSEND);
319 errp = &ct->ct_error;
325 if (ct->ct_wait.tv_usec == -1) {
326 timeout = utimeout; /* use supplied timeout */
328 timeout = ct->ct_wait; /* use default timeout */
332 mtx_assert(&ct->ct_lock, MA_OWNED);
337 mtx_unlock(&ct->ct_lock);
340 * Leave space to pre-pend the record mark.
342 mreq = m_gethdr(M_WAITOK, MT_DATA);
343 mreq->m_data += sizeof(uint32_t);
344 KASSERT(ct->ct_mpos + sizeof(uint32_t) <= MHLEN,
345 ("RPC header too big"));
346 bcopy(ct->ct_mcallc, mreq->m_data, ct->ct_mpos);
347 mreq->m_len = ct->ct_mpos;
350 * The XID is the first thing in the request.
352 *mtod(mreq, uint32_t *) = htonl(xid);
354 xdrmbuf_create(&xdrs, mreq, XDR_ENCODE);
356 errp->re_status = stat = RPC_SUCCESS;
358 if ((! XDR_PUTINT32(&xdrs, &proc)) ||
359 (! AUTH_MARSHALL(auth, xid, &xdrs,
360 m_copym(args, 0, M_COPYALL, M_WAITOK)))) {
361 errp->re_status = stat = RPC_CANTENCODEARGS;
362 mtx_lock(&ct->ct_lock);
365 mreq->m_pkthdr.len = m_length(mreq, NULL);
368 * Prepend a record marker containing the packet length.
370 M_PREPEND(mreq, sizeof(uint32_t), M_WAITOK);
371 *mtod(mreq, uint32_t *) =
372 htonl(0x80000000 | (mreq->m_pkthdr.len - sizeof(uint32_t)));
375 mtx_lock(&ct->ct_lock);
377 * Check to see if the other end has already started to close down
378 * the connection. The upcall will have set ct_error.re_status
379 * to RPC_CANTRECV if this is the case.
380 * If the other end starts to close down the connection after this
381 * point, it will be detected later when cr_error is checked,
382 * since the request is in the ct_pending queue.
384 if (ct->ct_error.re_status == RPC_CANTRECV) {
385 if (errp != &ct->ct_error) {
386 errp->re_errno = ct->ct_error.re_errno;
387 errp->re_status = RPC_CANTRECV;
392 TAILQ_INSERT_TAIL(&ct->ct_pending, cr, cr_link);
393 mtx_unlock(&ct->ct_lock);
396 * sosend consumes mreq.
398 error = sosend(ct->ct_socket, NULL, NULL, mreq, NULL, 0, curthread);
400 if (error == EMSGSIZE) {
401 SOCKBUF_LOCK(&ct->ct_socket->so_snd);
402 sbwait(&ct->ct_socket->so_snd);
403 SOCKBUF_UNLOCK(&ct->ct_socket->so_snd);
404 AUTH_VALIDATE(auth, xid, NULL, NULL);
405 mtx_lock(&ct->ct_lock);
406 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
410 reply_msg.acpted_rply.ar_verf.oa_flavor = AUTH_NULL;
411 reply_msg.acpted_rply.ar_verf.oa_base = cr->cr_verf;
412 reply_msg.acpted_rply.ar_verf.oa_length = 0;
413 reply_msg.acpted_rply.ar_results.where = NULL;
414 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
416 mtx_lock(&ct->ct_lock);
418 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
419 errp->re_errno = error;
420 errp->re_status = stat = RPC_CANTSEND;
425 * Check to see if we got an upcall while waiting for the
426 * lock. In both these cases, the request has been removed
427 * from ct->ct_pending.
430 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
431 errp->re_errno = cr->cr_error;
432 errp->re_status = stat = RPC_CANTRECV;
436 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
441 * Hack to provide rpc-based message passing
443 if (timeout.tv_sec == 0 && timeout.tv_usec == 0) {
444 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
445 errp->re_status = stat = RPC_TIMEDOUT;
449 error = msleep(cr, &ct->ct_lock, ct->ct_waitflag, ct->ct_waitchan,
452 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
456 * The sleep returned an error so our request is still
457 * on the list. Turn the error code into an
458 * appropriate client status.
460 errp->re_errno = error;
471 errp->re_status = stat;
475 * We were woken up by the upcall. If the
476 * upcall had a receive error, report that,
477 * otherwise we have a reply.
480 errp->re_errno = cr->cr_error;
481 errp->re_status = stat = RPC_CANTRECV;
488 * Now decode and validate the response. We need to drop the
489 * lock since xdr_replymsg may end up sleeping in malloc.
491 mtx_unlock(&ct->ct_lock);
493 if (ext && ext->rc_feedback)
494 ext->rc_feedback(FEEDBACK_OK, proc, ext->rc_feedback_arg);
496 xdrmbuf_create(&xdrs, cr->cr_mrep, XDR_DECODE);
497 ok = xdr_replymsg(&xdrs, &reply_msg);
501 if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
502 (reply_msg.acpted_rply.ar_stat == SUCCESS))
503 errp->re_status = stat = RPC_SUCCESS;
505 stat = _seterr_reply(&reply_msg, errp);
507 if (stat == RPC_SUCCESS) {
508 results = xdrmbuf_getall(&xdrs);
509 if (!AUTH_VALIDATE(auth, xid,
510 &reply_msg.acpted_rply.ar_verf,
512 errp->re_status = stat = RPC_AUTHERROR;
513 errp->re_why = AUTH_INVALIDRESP;
516 ("auth validated but no result"));
519 } /* end successful completion */
521 * If unsuccessful AND error is an authentication error
522 * then refresh credentials and try again, else break
524 else if (stat == RPC_AUTHERROR)
525 /* maybe our credentials need to be refreshed ... */
526 if (nrefreshes > 0 &&
527 AUTH_REFRESH(auth, &reply_msg)) {
530 mtx_lock(&ct->ct_lock);
533 /* end of unsuccessful completion */
534 } /* end of valid reply message */
536 errp->re_status = stat = RPC_CANTDECODERES;
539 mtx_lock(&ct->ct_lock);
541 mtx_assert(&ct->ct_lock, MA_OWNED);
543 KASSERT(stat != RPC_SUCCESS || *resultsp,
544 ("RPC_SUCCESS without reply"));
549 m_freem(cr->cr_mrep);
555 mtx_unlock(&ct->ct_lock);
557 if (auth && stat != RPC_SUCCESS)
558 AUTH_VALIDATE(auth, xid, NULL, NULL);
566 clnt_vc_geterr(CLIENT *cl, struct rpc_err *errp)
568 struct ct_data *ct = (struct ct_data *) cl->cl_private;
570 *errp = ct->ct_error;
574 clnt_vc_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr)
579 xdrs.x_op = XDR_FREE;
580 dummy = (*xdr_res)(&xdrs, res_ptr);
587 clnt_vc_abort(CLIENT *cl)
592 clnt_vc_control(CLIENT *cl, u_int request, void *info)
594 struct ct_data *ct = (struct ct_data *)cl->cl_private;
598 mtx_lock(&ct->ct_lock);
602 ct->ct_closeit = TRUE;
603 mtx_unlock(&ct->ct_lock);
605 case CLSET_FD_NCLOSE:
606 ct->ct_closeit = FALSE;
607 mtx_unlock(&ct->ct_lock);
613 /* for other requests which use info */
615 mtx_unlock(&ct->ct_lock);
620 if (time_not_ok((struct timeval *)info)) {
621 mtx_unlock(&ct->ct_lock);
624 ct->ct_wait = *(struct timeval *)infop;
627 *(struct timeval *)infop = ct->ct_wait;
629 case CLGET_SERVER_ADDR:
630 (void) memcpy(info, &ct->ct_addr, (size_t)ct->ct_addr.ss_len);
634 * Slightly different semantics to userland - we use
635 * sockaddr instead of netbuf.
637 memcpy(info, &ct->ct_addr, ct->ct_addr.ss_len);
639 case CLSET_SVC_ADDR: /* set to new address */
640 mtx_unlock(&ct->ct_lock);
643 *(uint32_t *)info = ct->ct_xid;
646 /* This will set the xid of the NEXT call */
647 /* decrement by 1 as clnt_vc_call() increments once */
648 ct->ct_xid = *(uint32_t *)info - 1;
652 * This RELIES on the information that, in the call body,
653 * the version number field is the fifth field from the
654 * beginning of the RPC header. MUST be changed if the
655 * call_struct is changed
658 ntohl(*(uint32_t *)(void *)(ct->ct_mcallc +
659 4 * BYTES_PER_XDR_UNIT));
663 *(uint32_t *)(void *)(ct->ct_mcallc +
664 4 * BYTES_PER_XDR_UNIT) =
665 htonl(*(uint32_t *)info);
670 * This RELIES on the information that, in the call body,
671 * the program number field is the fourth field from the
672 * beginning of the RPC header. MUST be changed if the
673 * call_struct is changed
676 ntohl(*(uint32_t *)(void *)(ct->ct_mcallc +
677 3 * BYTES_PER_XDR_UNIT));
681 *(uint32_t *)(void *)(ct->ct_mcallc +
682 3 * BYTES_PER_XDR_UNIT) =
683 htonl(*(uint32_t *)info);
687 ct->ct_waitchan = (const char *)info;
691 *(const char **) info = ct->ct_waitchan;
694 case CLSET_INTERRUPTIBLE:
696 ct->ct_waitflag = PCATCH;
701 case CLGET_INTERRUPTIBLE:
703 *(int *) info = TRUE;
705 *(int *) info = FALSE;
708 case CLSET_BACKCHANNEL:
709 xprt = (SVCXPRT *)info;
710 if (ct->ct_backchannelxprt == NULL) {
712 ct->ct_backchannelxprt = xprt;
717 mtx_unlock(&ct->ct_lock);
721 mtx_unlock(&ct->ct_lock);
726 clnt_vc_close(CLIENT *cl)
728 struct ct_data *ct = (struct ct_data *) cl->cl_private;
729 struct ct_request *cr;
731 mtx_lock(&ct->ct_lock);
734 mtx_unlock(&ct->ct_lock);
738 if (ct->ct_closing) {
739 while (ct->ct_closing)
740 msleep(ct, &ct->ct_lock, 0, "rpcclose", 0);
741 KASSERT(ct->ct_closed, ("client should be closed"));
742 mtx_unlock(&ct->ct_lock);
747 ct->ct_closing = TRUE;
748 mtx_unlock(&ct->ct_lock);
750 SOCKBUF_LOCK(&ct->ct_socket->so_rcv);
751 soupcall_clear(ct->ct_socket, SO_RCV);
752 clnt_vc_upcallsdone(ct);
753 SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv);
756 * Abort any pending requests and wait until everyone
757 * has finished with clnt_vc_call.
759 mtx_lock(&ct->ct_lock);
760 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) {
762 cr->cr_error = ESHUTDOWN;
766 while (ct->ct_threads)
767 msleep(ct, &ct->ct_lock, 0, "rpcclose", 0);
770 ct->ct_closing = FALSE;
771 ct->ct_closed = TRUE;
772 mtx_unlock(&ct->ct_lock);
777 clnt_vc_destroy(CLIENT *cl)
779 struct ct_data *ct = (struct ct_data *) cl->cl_private;
780 struct socket *so = NULL;
785 mtx_lock(&ct->ct_lock);
786 xprt = ct->ct_backchannelxprt;
787 ct->ct_backchannelxprt = NULL;
789 mtx_unlock(&ct->ct_lock); /* To avoid a LOR. */
790 sx_xlock(&xprt->xp_lock);
791 mtx_lock(&ct->ct_lock);
793 sx_xunlock(&xprt->xp_lock);
797 if (ct->ct_closeit) {
802 mtx_unlock(&ct->ct_lock);
804 mtx_destroy(&ct->ct_lock);
806 soshutdown(so, SHUT_WR);
809 mem_free(ct, sizeof(struct ct_data));
810 if (cl->cl_netid && cl->cl_netid[0])
811 mem_free(cl->cl_netid, strlen(cl->cl_netid) +1);
812 if (cl->cl_tp && cl->cl_tp[0])
813 mem_free(cl->cl_tp, strlen(cl->cl_tp) +1);
814 mem_free(cl, sizeof(CLIENT));
818 * Make sure that the time is not garbage. -1 value is disallowed.
819 * Note this is different from time_not_ok in clnt_dg.c
822 time_not_ok(struct timeval *t)
824 return (t->tv_sec <= -1 || t->tv_sec > 100000000 ||
825 t->tv_usec <= -1 || t->tv_usec > 1000000);
829 clnt_vc_soupcall(struct socket *so, void *arg, int waitflag)
831 struct ct_data *ct = (struct ct_data *) arg;
834 struct ct_request *cr;
835 int error, rcvflag, foundreq;
836 uint32_t xid_plus_direction[2], header;
841 CTASSERT(sizeof(xid_plus_direction) == 2 * sizeof(uint32_t));
843 uio.uio_td = curthread;
846 * If ct_record_resid is zero, we are waiting for a
849 if (ct->ct_record_resid == 0) {
852 * Make sure there is either a whole record
853 * mark in the buffer or there is some other
857 if (sbavail(&so->so_rcv) >= sizeof(uint32_t)
858 || (so->so_rcv.sb_state & SBS_CANTRCVMORE)
865 SOCKBUF_UNLOCK(&so->so_rcv);
866 uio.uio_resid = sizeof(uint32_t);
868 rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK;
869 error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag);
870 SOCKBUF_LOCK(&so->so_rcv);
872 if (error == EWOULDBLOCK)
876 * If there was an error, wake up all pending
879 if (error || uio.uio_resid > 0) {
881 mtx_lock(&ct->ct_lock);
884 * We must have got EOF trying
885 * to read from the stream.
889 ct->ct_error.re_status = RPC_CANTRECV;
890 ct->ct_error.re_errno = error;
891 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) {
892 cr->cr_error = error;
895 mtx_unlock(&ct->ct_lock);
898 m_copydata(m, 0, sizeof(uint32_t), (char *)&header);
899 header = ntohl(header);
900 ct->ct_record = NULL;
901 ct->ct_record_resid = header & 0x7fffffff;
902 ct->ct_record_eor = ((header & 0x80000000) != 0);
906 * Wait until the socket has the whole record
910 if (sbavail(&so->so_rcv) >= ct->ct_record_resid
911 || (so->so_rcv.sb_state & SBS_CANTRCVMORE)
919 * We have the record mark. Read as much as
920 * the socket has buffered up to the end of
923 SOCKBUF_UNLOCK(&so->so_rcv);
924 uio.uio_resid = ct->ct_record_resid;
926 rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK;
927 error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag);
928 SOCKBUF_LOCK(&so->so_rcv);
930 if (error == EWOULDBLOCK)
933 if (error || uio.uio_resid == ct->ct_record_resid)
937 * If we have part of the record already,
938 * chain this bit onto the end.
941 m_last(ct->ct_record)->m_next = m;
945 ct->ct_record_resid = uio.uio_resid;
948 * If we have the entire record, see if we can
949 * match it to a request.
951 if (ct->ct_record_resid == 0
952 && ct->ct_record_eor) {
954 * The XID is in the first uint32_t of
955 * the reply and the message direction
958 if (ct->ct_record->m_len <
959 sizeof(xid_plus_direction) &&
960 m_length(ct->ct_record, NULL) <
961 sizeof(xid_plus_direction)) {
962 m_freem(ct->ct_record);
965 m_copydata(ct->ct_record, 0,
966 sizeof(xid_plus_direction),
967 (char *)xid_plus_direction);
968 xid_plus_direction[0] =
969 ntohl(xid_plus_direction[0]);
970 xid_plus_direction[1] =
971 ntohl(xid_plus_direction[1]);
972 /* Check message direction. */
973 if (xid_plus_direction[1] == CALL) {
974 /* This is a backchannel request. */
975 mtx_lock(&ct->ct_lock);
976 xprt = ct->ct_backchannelxprt;
978 mtx_unlock(&ct->ct_lock);
979 /* Just throw it away. */
980 m_freem(ct->ct_record);
981 ct->ct_record = NULL;
983 cd = (struct cf_conn *)
987 * The requests are chained
988 * in the m_nextpkt list.
991 m2->m_nextpkt != NULL)
992 /* Find end of list. */
1000 ct->ct_record->m_nextpkt =
1002 ct->ct_record = NULL;
1004 mtx_unlock(&ct->ct_lock);
1007 mtx_lock(&ct->ct_lock);
1009 TAILQ_FOREACH(cr, &ct->ct_pending,
1012 xid_plus_direction[0]) {
1018 * the XID to zero so
1019 * that we will ignore
1032 mtx_unlock(&ct->ct_lock);
1035 m_freem(ct->ct_record);
1036 ct->ct_record = NULL;
1041 ct->ct_upcallrefs--;
1042 if (ct->ct_upcallrefs < 0)
1043 panic("rpcvc upcall refcnt");
1044 if (ct->ct_upcallrefs == 0)
1045 wakeup(&ct->ct_upcallrefs);
1050 * Wait for all upcalls in progress to complete.
1053 clnt_vc_upcallsdone(struct ct_data *ct)
1056 SOCKBUF_LOCK_ASSERT(&ct->ct_socket->so_rcv);
1058 while (ct->ct_upcallrefs > 0)
1059 (void) msleep(&ct->ct_upcallrefs,
1060 SOCKBUF_MTX(&ct->ct_socket->so_rcv), 0, "rpcvcup", 0);