FreeBSD/Linux Kernel Cross Reference
sys/rpc/clnt_dg.c
1 /* $NetBSD: clnt_dg.c,v 1.4 2000/07/14 08:40:41 fvdl 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 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
32 */
33
34 #if defined(LIBC_SCCS) && !defined(lint)
35 #ident "@(#)clnt_dg.c 1.23 94/04/22 SMI"
36 static char sccsid[] = "@(#)clnt_dg.c 1.19 89/03/16 Copyr 1988 Sun Micro";
37 #endif
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD: releng/10.3/sys/rpc/clnt_dg.c 261046 2014-01-22 23:45:27Z mav $");
40
41 /*
42 * Implements a connectionless client side RPC.
43 */
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/lock.h>
49 #include <sys/malloc.h>
50 #include <sys/mbuf.h>
51 #include <sys/mutex.h>
52 #include <sys/pcpu.h>
53 #include <sys/proc.h>
54 #include <sys/socket.h>
55 #include <sys/socketvar.h>
56 #include <sys/time.h>
57 #include <sys/uio.h>
58
59 #include <net/vnet.h>
60
61 #include <rpc/rpc.h>
62 #include <rpc/rpc_com.h>
63
64
65 #ifdef _FREEFALL_CONFIG
66 /*
67 * Disable RPC exponential back-off for FreeBSD.org systems.
68 */
69 #define RPC_MAX_BACKOFF 1 /* second */
70 #else
71 #define RPC_MAX_BACKOFF 30 /* seconds */
72 #endif
73
74 static bool_t time_not_ok(struct timeval *);
75 static enum clnt_stat clnt_dg_call(CLIENT *, struct rpc_callextra *,
76 rpcproc_t, struct mbuf *, struct mbuf **, struct timeval);
77 static void clnt_dg_geterr(CLIENT *, struct rpc_err *);
78 static bool_t clnt_dg_freeres(CLIENT *, xdrproc_t, void *);
79 static void clnt_dg_abort(CLIENT *);
80 static bool_t clnt_dg_control(CLIENT *, u_int, void *);
81 static void clnt_dg_close(CLIENT *);
82 static void clnt_dg_destroy(CLIENT *);
83 static int clnt_dg_soupcall(struct socket *so, void *arg, int waitflag);
84
85 static struct clnt_ops clnt_dg_ops = {
86 .cl_call = clnt_dg_call,
87 .cl_abort = clnt_dg_abort,
88 .cl_geterr = clnt_dg_geterr,
89 .cl_freeres = clnt_dg_freeres,
90 .cl_close = clnt_dg_close,
91 .cl_destroy = clnt_dg_destroy,
92 .cl_control = clnt_dg_control
93 };
94
95 /*
96 * A pending RPC request which awaits a reply. Requests which have
97 * received their reply will have cr_xid set to zero and cr_mrep to
98 * the mbuf chain of the reply.
99 */
100 struct cu_request {
101 TAILQ_ENTRY(cu_request) cr_link;
102 CLIENT *cr_client; /* owner */
103 uint32_t cr_xid; /* XID of request */
104 struct mbuf *cr_mrep; /* reply received by upcall */
105 int cr_error; /* any error from upcall */
106 char cr_verf[MAX_AUTH_BYTES]; /* reply verf */
107 };
108
109 TAILQ_HEAD(cu_request_list, cu_request);
110
111 #define MCALL_MSG_SIZE 24
112
113 /*
114 * This structure is pointed to by the socket buffer's sb_upcallarg
115 * member. It is separate from the client private data to facilitate
116 * multiple clients sharing the same socket. The cs_lock mutex is used
117 * to protect all fields of this structure, the socket's receive
118 * buffer SOCKBUF_LOCK is used to ensure that exactly one of these
119 * structures is installed on the socket.
120 */
121 struct cu_socket {
122 struct mtx cs_lock;
123 int cs_refs; /* Count of clients */
124 struct cu_request_list cs_pending; /* Requests awaiting replies */
125 int cs_upcallrefs; /* Refcnt of upcalls in prog.*/
126 };
127
128 static void clnt_dg_upcallsdone(struct socket *, struct cu_socket *);
129
130 /*
131 * Private data kept per client handle
132 */
133 struct cu_data {
134 int cu_threads; /* # threads in clnt_vc_call */
135 bool_t cu_closing; /* TRUE if we are closing */
136 bool_t cu_closed; /* TRUE if we are closed */
137 struct socket *cu_socket; /* connection socket */
138 bool_t cu_closeit; /* opened by library */
139 struct sockaddr_storage cu_raddr; /* remote address */
140 int cu_rlen;
141 struct timeval cu_wait; /* retransmit interval */
142 struct timeval cu_total; /* total time for the call */
143 struct rpc_err cu_error;
144 uint32_t cu_xid;
145 char cu_mcallc[MCALL_MSG_SIZE]; /* marshalled callmsg */
146 size_t cu_mcalllen;
147 size_t cu_sendsz; /* send size */
148 size_t cu_recvsz; /* recv size */
149 int cu_async;
150 int cu_connect; /* Use connect(). */
151 int cu_connected; /* Have done connect(). */
152 const char *cu_waitchan;
153 int cu_waitflag;
154 int cu_cwnd; /* congestion window */
155 int cu_sent; /* number of in-flight RPCs */
156 bool_t cu_cwnd_wait;
157 };
158
159 #define CWNDSCALE 256
160 #define MAXCWND (32 * CWNDSCALE)
161
162 /*
163 * Connection less client creation returns with client handle parameters.
164 * Default options are set, which the user can change using clnt_control().
165 * fd should be open and bound.
166 * NB: The rpch->cl_auth is initialized to null authentication.
167 * Caller may wish to set this something more useful.
168 *
169 * sendsz and recvsz are the maximum allowable packet sizes that can be
170 * sent and received. Normally they are the same, but they can be
171 * changed to improve the program efficiency and buffer allocation.
172 * If they are 0, use the transport default.
173 *
174 * If svcaddr is NULL, returns NULL.
175 */
176 CLIENT *
177 clnt_dg_create(
178 struct socket *so,
179 struct sockaddr *svcaddr, /* servers address */
180 rpcprog_t program, /* program number */
181 rpcvers_t version, /* version number */
182 size_t sendsz, /* buffer recv size */
183 size_t recvsz) /* buffer send size */
184 {
185 CLIENT *cl = NULL; /* client handle */
186 struct cu_data *cu = NULL; /* private data */
187 struct cu_socket *cs = NULL;
188 struct sockbuf *sb;
189 struct timeval now;
190 struct rpc_msg call_msg;
191 struct __rpc_sockinfo si;
192 XDR xdrs;
193 int error;
194
195 if (svcaddr == NULL) {
196 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
197 return (NULL);
198 }
199
200 if (!__rpc_socket2sockinfo(so, &si)) {
201 rpc_createerr.cf_stat = RPC_TLIERROR;
202 rpc_createerr.cf_error.re_errno = 0;
203 return (NULL);
204 }
205
206 /*
207 * Find the receive and the send size
208 */
209 sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz);
210 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz);
211 if ((sendsz == 0) || (recvsz == 0)) {
212 rpc_createerr.cf_stat = RPC_TLIERROR; /* XXX */
213 rpc_createerr.cf_error.re_errno = 0;
214 return (NULL);
215 }
216
217 cl = mem_alloc(sizeof (CLIENT));
218
219 /*
220 * Should be multiple of 4 for XDR.
221 */
222 sendsz = ((sendsz + 3) / 4) * 4;
223 recvsz = ((recvsz + 3) / 4) * 4;
224 cu = mem_alloc(sizeof (*cu));
225 cu->cu_threads = 0;
226 cu->cu_closing = FALSE;
227 cu->cu_closed = FALSE;
228 (void) memcpy(&cu->cu_raddr, svcaddr, (size_t)svcaddr->sa_len);
229 cu->cu_rlen = svcaddr->sa_len;
230 /* Other values can also be set through clnt_control() */
231 cu->cu_wait.tv_sec = 3; /* heuristically chosen */
232 cu->cu_wait.tv_usec = 0;
233 cu->cu_total.tv_sec = -1;
234 cu->cu_total.tv_usec = -1;
235 cu->cu_sendsz = sendsz;
236 cu->cu_recvsz = recvsz;
237 cu->cu_async = FALSE;
238 cu->cu_connect = FALSE;
239 cu->cu_connected = FALSE;
240 cu->cu_waitchan = "rpcrecv";
241 cu->cu_waitflag = 0;
242 cu->cu_cwnd = MAXCWND / 2;
243 cu->cu_sent = 0;
244 cu->cu_cwnd_wait = FALSE;
245 (void) getmicrotime(&now);
246 cu->cu_xid = __RPC_GETXID(&now);
247 call_msg.rm_xid = cu->cu_xid;
248 call_msg.rm_call.cb_prog = program;
249 call_msg.rm_call.cb_vers = version;
250 xdrmem_create(&xdrs, cu->cu_mcallc, MCALL_MSG_SIZE, XDR_ENCODE);
251 if (! xdr_callhdr(&xdrs, &call_msg)) {
252 rpc_createerr.cf_stat = RPC_CANTENCODEARGS; /* XXX */
253 rpc_createerr.cf_error.re_errno = 0;
254 goto err2;
255 }
256 cu->cu_mcalllen = XDR_GETPOS(&xdrs);
257
258 /*
259 * By default, closeit is always FALSE. It is users responsibility
260 * to do a close on it, else the user may use clnt_control
261 * to let clnt_destroy do it for him/her.
262 */
263 cu->cu_closeit = FALSE;
264 cu->cu_socket = so;
265 error = soreserve(so, (u_long)sendsz, (u_long)recvsz);
266 if (error != 0) {
267 rpc_createerr.cf_stat = RPC_FAILED;
268 rpc_createerr.cf_error.re_errno = error;
269 goto err2;
270 }
271
272 sb = &so->so_rcv;
273 SOCKBUF_LOCK(&so->so_rcv);
274 recheck_socket:
275 if (sb->sb_upcall) {
276 if (sb->sb_upcall != clnt_dg_soupcall) {
277 SOCKBUF_UNLOCK(&so->so_rcv);
278 printf("clnt_dg_create(): socket already has an incompatible upcall\n");
279 goto err2;
280 }
281 cs = (struct cu_socket *) sb->sb_upcallarg;
282 mtx_lock(&cs->cs_lock);
283 cs->cs_refs++;
284 mtx_unlock(&cs->cs_lock);
285 } else {
286 /*
287 * We are the first on this socket - allocate the
288 * structure and install it in the socket.
289 */
290 SOCKBUF_UNLOCK(&so->so_rcv);
291 cs = mem_alloc(sizeof(*cs));
292 SOCKBUF_LOCK(&so->so_rcv);
293 if (sb->sb_upcall) {
294 /*
295 * We have lost a race with some other client.
296 */
297 mem_free(cs, sizeof(*cs));
298 goto recheck_socket;
299 }
300 mtx_init(&cs->cs_lock, "cs->cs_lock", NULL, MTX_DEF);
301 cs->cs_refs = 1;
302 cs->cs_upcallrefs = 0;
303 TAILQ_INIT(&cs->cs_pending);
304 soupcall_set(so, SO_RCV, clnt_dg_soupcall, cs);
305 }
306 SOCKBUF_UNLOCK(&so->so_rcv);
307
308 cl->cl_refs = 1;
309 cl->cl_ops = &clnt_dg_ops;
310 cl->cl_private = (caddr_t)(void *)cu;
311 cl->cl_auth = authnone_create();
312 cl->cl_tp = NULL;
313 cl->cl_netid = NULL;
314 return (cl);
315 err2:
316 if (cl) {
317 mem_free(cl, sizeof (CLIENT));
318 if (cu)
319 mem_free(cu, sizeof (*cu));
320 }
321 return (NULL);
322 }
323
324 static enum clnt_stat
325 clnt_dg_call(
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 */
332 {
333 struct cu_data *cu = (struct cu_data *)cl->cl_private;
334 struct cu_socket *cs;
335 struct rpc_timers *rt;
336 AUTH *auth;
337 struct rpc_err *errp;
338 enum clnt_stat stat;
339 XDR xdrs;
340 struct rpc_msg reply_msg;
341 bool_t ok;
342 int retrans; /* number of re-transmits so far */
343 int nrefreshes = 2; /* number of times to refresh cred */
344 struct timeval *tvp;
345 int timeout;
346 int retransmit_time;
347 int next_sendtime, starttime, rtt, time_waited, tv = 0;
348 struct sockaddr *sa;
349 socklen_t salen;
350 uint32_t xid = 0;
351 struct mbuf *mreq = NULL, *results;
352 struct cu_request *cr;
353 int error;
354
355 cs = cu->cu_socket->so_rcv.sb_upcallarg;
356 cr = malloc(sizeof(struct cu_request), M_RPC, M_WAITOK);
357
358 mtx_lock(&cs->cs_lock);
359
360 if (cu->cu_closing || cu->cu_closed) {
361 mtx_unlock(&cs->cs_lock);
362 free(cr, M_RPC);
363 return (RPC_CANTSEND);
364 }
365 cu->cu_threads++;
366
367 if (ext) {
368 auth = ext->rc_auth;
369 errp = &ext->rc_err;
370 } else {
371 auth = cl->cl_auth;
372 errp = &cu->cu_error;
373 }
374
375 cr->cr_client = cl;
376 cr->cr_mrep = NULL;
377 cr->cr_error = 0;
378
379 if (cu->cu_total.tv_usec == -1) {
380 tvp = &utimeout; /* use supplied timeout */
381 } else {
382 tvp = &cu->cu_total; /* use default timeout */
383 }
384 if (tvp->tv_sec || tvp->tv_usec)
385 timeout = tvtohz(tvp);
386 else
387 timeout = 0;
388
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);
394 if (error) {
395 errp->re_errno = error;
396 errp->re_status = stat = RPC_CANTSEND;
397 goto out;
398 }
399 cu->cu_connected = 1;
400 }
401 if (cu->cu_connected) {
402 sa = NULL;
403 salen = 0;
404 } else {
405 sa = (struct sockaddr *)&cu->cu_raddr;
406 salen = cu->cu_rlen;
407 }
408 time_waited = 0;
409 retrans = 0;
410 if (ext && ext->rc_timers) {
411 rt = ext->rc_timers;
412 if (!rt->rt_rtxcur)
413 rt->rt_rtxcur = tvtohz(&cu->cu_wait);
414 retransmit_time = next_sendtime = rt->rt_rtxcur;
415 } else {
416 rt = NULL;
417 retransmit_time = next_sendtime = tvtohz(&cu->cu_wait);
418 }
419
420 starttime = ticks;
421
422 call_again:
423 mtx_assert(&cs->cs_lock, MA_OWNED);
424
425 cu->cu_xid++;
426 xid = cu->cu_xid;
427
428 send_again:
429 mtx_unlock(&cs->cs_lock);
430
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;
435
436 /*
437 * The XID is the first thing in the request.
438 */
439 *mtod(mreq, uint32_t *) = htonl(xid);
440
441 xdrmbuf_create(&xdrs, mreq, XDR_ENCODE);
442
443 if (cu->cu_async == TRUE && args == NULL)
444 goto get_reply;
445
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);
451 goto out;
452 }
453 mreq->m_pkthdr.len = m_length(mreq, NULL);
454
455 cr->cr_xid = xid;
456 mtx_lock(&cs->cs_lock);
457
458 /*
459 * Try to get a place in the congestion window.
460 */
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);
465 if (error) {
466 errp->re_errno = error;
467 if (error == EINTR || error == ERESTART)
468 errp->re_status = stat = RPC_INTR;
469 else
470 errp->re_status = stat = RPC_CANTSEND;
471 goto out;
472 }
473 }
474 cu->cu_sent += CWNDSCALE;
475
476 TAILQ_INSERT_TAIL(&cs->cs_pending, cr, cr_link);
477 mtx_unlock(&cs->cs_lock);
478
479 /*
480 * sosend consumes mreq.
481 */
482 error = sosend(cu->cu_socket, sa, NULL, mreq, NULL, 0, curthread);
483 mreq = NULL;
484
485 /*
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.)
489 */
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;
495
496 mtx_lock(&cs->cs_lock);
497 if (error) {
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);
505 }
506 goto out;
507 }
508
509 /*
510 * Check to see if we got an upcall while waiting for the
511 * lock.
512 */
513 if (cr->cr_error) {
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);
521 }
522 goto out;
523 }
524 if (cr->cr_mrep) {
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);
530 }
531 goto got_reply;
532 }
533
534 /*
535 * Hack to provide rpc-based message passing
536 */
537 if (timeout == 0) {
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);
544 }
545 goto out;
546 }
547
548 get_reply:
549 for (;;) {
550 /* Decide how long to wait. */
551 if (next_sendtime < timeout)
552 tv = next_sendtime;
553 else
554 tv = timeout;
555 tv -= time_waited;
556
557 if (tv > 0) {
558 if (cu->cu_closing || cu->cu_closed) {
559 error = 0;
560 cr->cr_error = ESHUTDOWN;
561 } else {
562 error = msleep(cr, &cs->cs_lock,
563 cu->cu_waitflag, cu->cu_waitchan, tv);
564 }
565 } else {
566 error = EWOULDBLOCK;
567 }
568
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);
574 }
575
576 if (!error) {
577 /*
578 * We were woken up by the upcall. If the
579 * upcall had a receive error, report that,
580 * otherwise we have a reply.
581 */
582 if (cr->cr_error) {
583 errp->re_errno = cr->cr_error;
584 errp->re_status = stat = RPC_CANTRECV;
585 goto out;
586 }
587
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;
592
593 if (rt) {
594 /*
595 * Add one to the time since a tick
596 * count of N means that the actual
597 * time taken was somewhere between N
598 * and N+1.
599 */
600 rtt = ticks - starttime + 1;
601
602 /*
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:
607 *
608 * RTTVAR = (1-beta) * RTTVAR + beta * |SRTT-R|
609 * SRTT = (1-alpha) * SRTT + alpha * R
610 *
611 * where alpha = 0.125 and beta = 0.25.
612 *
613 * The initial retransmit timeout is
614 * SRTT + 4*RTTVAR and doubles on each
615 * retransmision.
616 */
617 if (rt->rt_srtt == 0) {
618 rt->rt_srtt = rtt;
619 rt->rt_deviate = rtt / 2;
620 } else {
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;
625 }
626 rt->rt_rtxcur = rt->rt_srtt + 4*rt->rt_deviate;
627 }
628
629 break;
630 }
631
632 /*
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.
636 */
637 if (error != EWOULDBLOCK) {
638 errp->re_errno = error;
639 if (error == EINTR || error == ERESTART)
640 errp->re_status = stat = RPC_INTR;
641 else
642 errp->re_status = stat = RPC_CANTRECV;
643 goto out;
644 }
645
646 time_waited = ticks - starttime;
647
648 /* Check for timeout. */
649 if (time_waited > timeout) {
650 errp->re_errno = EWOULDBLOCK;
651 errp->re_status = stat = RPC_TIMEDOUT;
652 goto out;
653 }
654
655 /* Retransmit if necessary. */
656 if (time_waited >= next_sendtime) {
657 cu->cu_cwnd /= 2;
658 if (cu->cu_cwnd < CWNDSCALE)
659 cu->cu_cwnd = CWNDSCALE;
660 if (ext && ext->rc_feedback) {
661 mtx_unlock(&cs->cs_lock);
662 if (retrans == 0)
663 ext->rc_feedback(FEEDBACK_REXMIT1,
664 proc, ext->rc_feedback_arg);
665 else
666 ext->rc_feedback(FEEDBACK_REXMIT2,
667 proc, ext->rc_feedback_arg);
668 mtx_lock(&cs->cs_lock);
669 }
670 if (cu->cu_closing || cu->cu_closed) {
671 errp->re_errno = ESHUTDOWN;
672 errp->re_status = stat = RPC_CANTRECV;
673 goto out;
674 }
675 retrans++;
676 /* update retransmit_time */
677 if (retransmit_time < RPC_MAX_BACKOFF * hz)
678 retransmit_time = 2 * retransmit_time;
679 next_sendtime += retransmit_time;
680 goto send_again;
681 }
682 cu->cu_sent += CWNDSCALE;
683 TAILQ_INSERT_TAIL(&cs->cs_pending, cr, cr_link);
684 }
685
686 got_reply:
687 /*
688 * Now decode and validate the response. We need to drop the
689 * lock since xdr_replymsg may end up sleeping in malloc.
690 */
691 mtx_unlock(&cs->cs_lock);
692
693 if (ext && ext->rc_feedback)
694 ext->rc_feedback(FEEDBACK_OK, proc, ext->rc_feedback_arg);
695
696 xdrmbuf_create(&xdrs, cr->cr_mrep, XDR_DECODE);
697 ok = xdr_replymsg(&xdrs, &reply_msg);
698 cr->cr_mrep = NULL;
699
700 if (ok) {
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;
704 else
705 stat = _seterr_reply(&reply_msg, &(cu->cu_error));
706
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,
711 &results)) {
712 errp->re_status = stat = RPC_AUTHERROR;
713 errp->re_why = AUTH_INVALIDRESP;
714 if (retrans &&
715 auth->ah_cred.oa_flavor == RPCSEC_GSS) {
716 /*
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
730 * them here.
731 */
732 XDR_DESTROY(&xdrs);
733 mtx_lock(&cs->cs_lock);
734 cu->cu_sent += CWNDSCALE;
735 TAILQ_INSERT_TAIL(&cs->cs_pending,
736 cr, cr_link);
737 cr->cr_mrep = NULL;
738 goto get_reply;
739 }
740 } else {
741 *resultsp = results;
742 }
743 } /* end successful completion */
744 /*
745 * If unsuccesful AND error is an authentication error
746 * then refresh credentials and try again, else break
747 */
748 else if (stat == RPC_AUTHERROR)
749 /* maybe our credentials need to be refreshed ... */
750 if (nrefreshes > 0 &&
751 AUTH_REFRESH(auth, &reply_msg)) {
752 nrefreshes--;
753 XDR_DESTROY(&xdrs);
754 mtx_lock(&cs->cs_lock);
755 goto call_again;
756 }
757 /* end of unsuccessful completion */
758 } /* end of valid reply message */
759 else {
760 errp->re_status = stat = RPC_CANTDECODERES;
761
762 }
763 XDR_DESTROY(&xdrs);
764 mtx_lock(&cs->cs_lock);
765 out:
766 mtx_assert(&cs->cs_lock, MA_OWNED);
767
768 if (mreq)
769 m_freem(mreq);
770 if (cr->cr_mrep)
771 m_freem(cr->cr_mrep);
772
773 cu->cu_threads--;
774 if (cu->cu_closing)
775 wakeup(cu);
776
777 mtx_unlock(&cs->cs_lock);
778
779 if (auth && stat != RPC_SUCCESS)
780 AUTH_VALIDATE(auth, xid, NULL, NULL);
781
782 free(cr, M_RPC);
783
784 return (stat);
785 }
786
787 static void
788 clnt_dg_geterr(CLIENT *cl, struct rpc_err *errp)
789 {
790 struct cu_data *cu = (struct cu_data *)cl->cl_private;
791
792 *errp = cu->cu_error;
793 }
794
795 static bool_t
796 clnt_dg_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr)
797 {
798 XDR xdrs;
799 bool_t dummy;
800
801 xdrs.x_op = XDR_FREE;
802 dummy = (*xdr_res)(&xdrs, res_ptr);
803
804 return (dummy);
805 }
806
807 /*ARGSUSED*/
808 static void
809 clnt_dg_abort(CLIENT *h)
810 {
811 }
812
813 static bool_t
814 clnt_dg_control(CLIENT *cl, u_int request, void *info)
815 {
816 struct cu_data *cu = (struct cu_data *)cl->cl_private;
817 struct cu_socket *cs;
818 struct sockaddr *addr;
819
820 cs = cu->cu_socket->so_rcv.sb_upcallarg;
821 mtx_lock(&cs->cs_lock);
822
823 switch (request) {
824 case CLSET_FD_CLOSE:
825 cu->cu_closeit = TRUE;
826 mtx_unlock(&cs->cs_lock);
827 return (TRUE);
828 case CLSET_FD_NCLOSE:
829 cu->cu_closeit = FALSE;
830 mtx_unlock(&cs->cs_lock);
831 return (TRUE);
832 }
833
834 /* for other requests which use info */
835 if (info == NULL) {
836 mtx_unlock(&cs->cs_lock);
837 return (FALSE);
838 }
839 switch (request) {
840 case CLSET_TIMEOUT:
841 if (time_not_ok((struct timeval *)info)) {
842 mtx_unlock(&cs->cs_lock);
843 return (FALSE);
844 }
845 cu->cu_total = *(struct timeval *)info;
846 break;
847 case CLGET_TIMEOUT:
848 *(struct timeval *)info = cu->cu_total;
849 break;
850 case CLSET_RETRY_TIMEOUT:
851 if (time_not_ok((struct timeval *)info)) {
852 mtx_unlock(&cs->cs_lock);
853 return (FALSE);
854 }
855 cu->cu_wait = *(struct timeval *)info;
856 break;
857 case CLGET_RETRY_TIMEOUT:
858 *(struct timeval *)info = cu->cu_wait;
859 break;
860 case CLGET_SVC_ADDR:
861 /*
862 * Slightly different semantics to userland - we use
863 * sockaddr instead of netbuf.
864 */
865 memcpy(info, &cu->cu_raddr, cu->cu_raddr.ss_len);
866 break;
867 case CLSET_SVC_ADDR: /* set to new address */
868 addr = (struct sockaddr *)info;
869 (void) memcpy(&cu->cu_raddr, addr, addr->sa_len);
870 break;
871 case CLGET_XID:
872 *(uint32_t *)info = cu->cu_xid;
873 break;
874
875 case CLSET_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;
879 break;
880
881 case CLGET_VERS:
882 /*
883 * This RELIES on the information that, in the call body,
884 * the version number field is the fifth field from the
885 * begining of the RPC header. MUST be changed if the
886 * call_struct is changed
887 */
888 *(uint32_t *)info =
889 ntohl(*(uint32_t *)(void *)(cu->cu_mcallc +
890 4 * BYTES_PER_XDR_UNIT));
891 break;
892
893 case CLSET_VERS:
894 *(uint32_t *)(void *)(cu->cu_mcallc + 4 * BYTES_PER_XDR_UNIT)
895 = htonl(*(uint32_t *)info);
896 break;
897
898 case CLGET_PROG:
899 /*
900 * This RELIES on the information that, in the call body,
901 * the program number field is the fourth field from the
902 * begining of the RPC header. MUST be changed if the
903 * call_struct is changed
904 */
905 *(uint32_t *)info =
906 ntohl(*(uint32_t *)(void *)(cu->cu_mcallc +
907 3 * BYTES_PER_XDR_UNIT));
908 break;
909
910 case CLSET_PROG:
911 *(uint32_t *)(void *)(cu->cu_mcallc + 3 * BYTES_PER_XDR_UNIT)
912 = htonl(*(uint32_t *)info);
913 break;
914 case CLSET_ASYNC:
915 cu->cu_async = *(int *)info;
916 break;
917 case CLSET_CONNECT:
918 cu->cu_connect = *(int *)info;
919 break;
920 case CLSET_WAITCHAN:
921 cu->cu_waitchan = (const char *)info;
922 break;
923 case CLGET_WAITCHAN:
924 *(const char **) info = cu->cu_waitchan;
925 break;
926 case CLSET_INTERRUPTIBLE:
927 if (*(int *) info)
928 cu->cu_waitflag = PCATCH;
929 else
930 cu->cu_waitflag = 0;
931 break;
932 case CLGET_INTERRUPTIBLE:
933 if (cu->cu_waitflag)
934 *(int *) info = TRUE;
935 else
936 *(int *) info = FALSE;
937 break;
938 default:
939 mtx_unlock(&cs->cs_lock);
940 return (FALSE);
941 }
942 mtx_unlock(&cs->cs_lock);
943 return (TRUE);
944 }
945
946 static void
947 clnt_dg_close(CLIENT *cl)
948 {
949 struct cu_data *cu = (struct cu_data *)cl->cl_private;
950 struct cu_socket *cs;
951 struct cu_request *cr;
952
953 cs = cu->cu_socket->so_rcv.sb_upcallarg;
954 mtx_lock(&cs->cs_lock);
955
956 if (cu->cu_closed) {
957 mtx_unlock(&cs->cs_lock);
958 return;
959 }
960
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);
966 return;
967 }
968
969 /*
970 * Abort any pending requests and wait until everyone
971 * has finished with clnt_vc_call.
972 */
973 cu->cu_closing = TRUE;
974 TAILQ_FOREACH(cr, &cs->cs_pending, cr_link) {
975 if (cr->cr_client == cl) {
976 cr->cr_xid = 0;
977 cr->cr_error = ESHUTDOWN;
978 wakeup(cr);
979 }
980 }
981
982 while (cu->cu_threads)
983 msleep(cu, &cs->cs_lock, 0, "rpcclose", 0);
984
985 cu->cu_closing = FALSE;
986 cu->cu_closed = TRUE;
987
988 mtx_unlock(&cs->cs_lock);
989 wakeup(cu);
990 }
991
992 static void
993 clnt_dg_destroy(CLIENT *cl)
994 {
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;
999
1000 cs = cu->cu_socket->so_rcv.sb_upcallarg;
1001 clnt_dg_close(cl);
1002
1003 SOCKBUF_LOCK(&cu->cu_socket->so_rcv);
1004 mtx_lock(&cs->cs_lock);
1005
1006 cs->cs_refs--;
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;
1015 } else {
1016 mtx_unlock(&cs->cs_lock);
1017 SOCKBUF_UNLOCK(&cu->cu_socket->so_rcv);
1018 lastsocketref = FALSE;
1019 }
1020
1021 if (cu->cu_closeit && lastsocketref) {
1022 so = cu->cu_socket;
1023 cu->cu_socket = NULL;
1024 }
1025
1026 if (so)
1027 soclose(so);
1028
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));
1035 }
1036
1037 /*
1038 * Make sure that the time is not garbage. -1 value is allowed.
1039 */
1040 static bool_t
1041 time_not_ok(struct timeval *t)
1042 {
1043 return (t->tv_sec < -1 || t->tv_sec > 100000000 ||
1044 t->tv_usec < -1 || t->tv_usec > 1000000);
1045 }
1046
1047 int
1048 clnt_dg_soupcall(struct socket *so, void *arg, int waitflag)
1049 {
1050 struct cu_socket *cs = (struct cu_socket *) arg;
1051 struct uio uio;
1052 struct mbuf *m;
1053 struct mbuf *control;
1054 struct cu_request *cr;
1055 int error, rcvflag, foundreq;
1056 uint32_t xid;
1057
1058 cs->cs_upcallrefs++;
1059 uio.uio_resid = 1000000000;
1060 uio.uio_td = curthread;
1061 do {
1062 SOCKBUF_UNLOCK(&so->so_rcv);
1063 m = NULL;
1064 control = NULL;
1065 rcvflag = MSG_DONTWAIT;
1066 error = soreceive(so, NULL, &uio, &m, &control, &rcvflag);
1067 if (control)
1068 m_freem(control);
1069 SOCKBUF_LOCK(&so->so_rcv);
1070
1071 if (error == EWOULDBLOCK)
1072 break;
1073
1074 /*
1075 * If there was an error, wake up all pending
1076 * requests.
1077 */
1078 if (error) {
1079 mtx_lock(&cs->cs_lock);
1080 TAILQ_FOREACH(cr, &cs->cs_pending, cr_link) {
1081 cr->cr_xid = 0;
1082 cr->cr_error = error;
1083 wakeup(cr);
1084 }
1085 mtx_unlock(&cs->cs_lock);
1086 break;
1087 }
1088
1089 /*
1090 * The XID is in the first uint32_t of the reply.
1091 */
1092 if (m->m_len < sizeof(xid) && m_length(m, NULL) < sizeof(xid)) {
1093 /*
1094 * Should never happen.
1095 */
1096 m_freem(m);
1097 continue;
1098 }
1099
1100 m_copydata(m, 0, sizeof(xid), (char *)&xid);
1101 xid = ntohl(xid);
1102
1103 /*
1104 * Attempt to match this reply with a pending request.
1105 */
1106 mtx_lock(&cs->cs_lock);
1107 foundreq = 0;
1108 TAILQ_FOREACH(cr, &cs->cs_pending, cr_link) {
1109 if (cr->cr_xid == xid) {
1110 /*
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
1116 * the queue.
1117 */
1118 cr->cr_xid = 0;
1119 cr->cr_mrep = m;
1120 cr->cr_error = 0;
1121 foundreq = 1;
1122 wakeup(cr);
1123 break;
1124 }
1125 }
1126 mtx_unlock(&cs->cs_lock);
1127
1128 /*
1129 * If we didn't find the matching request, just drop
1130 * it - its probably a repeated reply.
1131 */
1132 if (!foundreq)
1133 m_freem(m);
1134 } while (m);
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);
1140 return (SU_OK);
1141 }
1142
1143 /*
1144 * Wait for all upcalls in progress to complete.
1145 */
1146 static void
1147 clnt_dg_upcallsdone(struct socket *so, struct cu_socket *cs)
1148 {
1149
1150 SOCKBUF_LOCK_ASSERT(&so->so_rcv);
1151
1152 while (cs->cs_upcallrefs > 0)
1153 (void) msleep(&cs->cs_upcallrefs, SOCKBUF_MTX(&so->so_rcv), 0,
1154 "rpcdgup", 0);
1155 }
Cache object: 0e0ad0bdd6a8b3f2b0f0e2335152690f
|