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sys/rpc/clnt_vc.c
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1 /* $NetBSD: clnt_vc.c,v 1.4 2000/07/14 08:40:42 fvdl Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (c) 2009, Sun Microsystems, Inc. 7 * All rights reserved. 8 * 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. 19 * 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. 31 */ 32 33 #if defined(LIBC_SCCS) && !defined(lint) 34 static char *sccsid2 = "@(#)clnt_tcp.c 1.37 87/10/05 Copyr 1984 Sun Micro"; 35 static char *sccsid = "@(#)clnt_tcp.c 2.2 88/08/01 4.0 RPCSRC"; 36 static char sccsid3[] = "@(#)clnt_vc.c 1.19 89/03/16 Copyr 1988 Sun Micro"; 37 #endif 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD: releng/12.0/sys/rpc/clnt_vc.c 326023 2017-11-20 19:43:44Z pfg $"); 40 41 /* 42 * clnt_tcp.c, Implements a TCP/IP based, client side RPC. 43 * 44 * Copyright (C) 1984, Sun Microsystems, Inc. 45 * 46 * TCP based RPC supports 'batched calls'. 47 * A sequence of calls may be batched-up in a send buffer. The rpc call 48 * return immediately to the client even though the call was not necessarily 49 * sent. The batching occurs if the results' xdr routine is NULL (0) AND 50 * the rpc timeout value is zero (see clnt.h, rpc). 51 * 52 * Clients should NOT casually batch calls that in fact return results; that is, 53 * the server side should be aware that a call is batched and not produce any 54 * return message. Batched calls that produce many result messages can 55 * deadlock (netlock) the client and the server.... 56 * 57 * Now go hang yourself. 58 */ 59 60 #include <sys/param.h> 61 #include <sys/systm.h> 62 #include <sys/kernel.h> 63 #include <sys/lock.h> 64 #include <sys/malloc.h> 65 #include <sys/mbuf.h> 66 #include <sys/mutex.h> 67 #include <sys/pcpu.h> 68 #include <sys/proc.h> 69 #include <sys/protosw.h> 70 #include <sys/socket.h> 71 #include <sys/socketvar.h> 72 #include <sys/sx.h> 73 #include <sys/syslog.h> 74 #include <sys/time.h> 75 #include <sys/uio.h> 76 77 #include <net/vnet.h> 78 79 #include <netinet/tcp.h> 80 81 #include <rpc/rpc.h> 82 #include <rpc/rpc_com.h> 83 #include <rpc/krpc.h> 84 85 struct cmessage { 86 struct cmsghdr cmsg; 87 struct cmsgcred cmcred; 88 }; 89 90 static enum clnt_stat clnt_vc_call(CLIENT *, struct rpc_callextra *, 91 rpcproc_t, struct mbuf *, struct mbuf **, struct timeval); 92 static void clnt_vc_geterr(CLIENT *, struct rpc_err *); 93 static bool_t clnt_vc_freeres(CLIENT *, xdrproc_t, void *); 94 static void clnt_vc_abort(CLIENT *); 95 static bool_t clnt_vc_control(CLIENT *, u_int, void *); 96 static void clnt_vc_close(CLIENT *); 97 static void clnt_vc_destroy(CLIENT *); 98 static bool_t time_not_ok(struct timeval *); 99 static int clnt_vc_soupcall(struct socket *so, void *arg, int waitflag); 100 101 static struct clnt_ops clnt_vc_ops = { 102 .cl_call = clnt_vc_call, 103 .cl_abort = clnt_vc_abort, 104 .cl_geterr = clnt_vc_geterr, 105 .cl_freeres = clnt_vc_freeres, 106 .cl_close = clnt_vc_close, 107 .cl_destroy = clnt_vc_destroy, 108 .cl_control = clnt_vc_control 109 }; 110 111 static void clnt_vc_upcallsdone(struct ct_data *); 112 113 static int fake_wchan; 114 115 /* 116 * Create a client handle for a connection. 117 * Default options are set, which the user can change using clnt_control()'s. 118 * The rpc/vc package does buffering similar to stdio, so the client 119 * must pick send and receive buffer sizes, 0 => use the default. 120 * NB: fd is copied into a private area. 121 * NB: The rpch->cl_auth is set null authentication. Caller may wish to 122 * set this something more useful. 123 * 124 * fd should be an open socket 125 */ 126 CLIENT * 127 clnt_vc_create( 128 struct socket *so, /* open file descriptor */ 129 struct sockaddr *raddr, /* servers address */ 130 const rpcprog_t prog, /* program number */ 131 const rpcvers_t vers, /* version number */ 132 size_t sendsz, /* buffer recv size */ 133 size_t recvsz, /* buffer send size */ 134 int intrflag) /* interruptible */ 135 { 136 CLIENT *cl; /* client handle */ 137 struct ct_data *ct = NULL; /* client handle */ 138 struct timeval now; 139 struct rpc_msg call_msg; 140 static uint32_t disrupt; 141 struct __rpc_sockinfo si; 142 XDR xdrs; 143 int error, interrupted, one = 1, sleep_flag; 144 struct sockopt sopt; 145 146 if (disrupt == 0) 147 disrupt = (uint32_t)(long)raddr; 148 149 cl = (CLIENT *)mem_alloc(sizeof (*cl)); 150 ct = (struct ct_data *)mem_alloc(sizeof (*ct)); 151 152 mtx_init(&ct->ct_lock, "ct->ct_lock", NULL, MTX_DEF); 153 ct->ct_threads = 0; 154 ct->ct_closing = FALSE; 155 ct->ct_closed = FALSE; 156 ct->ct_upcallrefs = 0; 157 158 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 159 error = soconnect(so, raddr, curthread); 160 SOCK_LOCK(so); 161 interrupted = 0; 162 sleep_flag = PSOCK; 163 if (intrflag != 0) 164 sleep_flag |= PCATCH; 165 while ((so->so_state & SS_ISCONNECTING) 166 && so->so_error == 0) { 167 error = msleep(&so->so_timeo, SOCK_MTX(so), 168 sleep_flag, "connec", 0); 169 if (error) { 170 if (error == EINTR || error == ERESTART) 171 interrupted = 1; 172 break; 173 } 174 } 175 if (error == 0) { 176 error = so->so_error; 177 so->so_error = 0; 178 } 179 SOCK_UNLOCK(so); 180 if (error) { 181 if (!interrupted) 182 so->so_state &= ~SS_ISCONNECTING; 183 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 184 rpc_createerr.cf_error.re_errno = error; 185 goto err; 186 } 187 } 188 189 if (!__rpc_socket2sockinfo(so, &si)) { 190 goto err; 191 } 192 193 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 194 bzero(&sopt, sizeof(sopt)); 195 sopt.sopt_dir = SOPT_SET; 196 sopt.sopt_level = SOL_SOCKET; 197 sopt.sopt_name = SO_KEEPALIVE; 198 sopt.sopt_val = &one; 199 sopt.sopt_valsize = sizeof(one); 200 sosetopt(so, &sopt); 201 } 202 203 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 204 bzero(&sopt, sizeof(sopt)); 205 sopt.sopt_dir = SOPT_SET; 206 sopt.sopt_level = IPPROTO_TCP; 207 sopt.sopt_name = TCP_NODELAY; 208 sopt.sopt_val = &one; 209 sopt.sopt_valsize = sizeof(one); 210 sosetopt(so, &sopt); 211 } 212 213 ct->ct_closeit = FALSE; 214 215 /* 216 * Set up private data struct 217 */ 218 ct->ct_socket = so; 219 ct->ct_wait.tv_sec = -1; 220 ct->ct_wait.tv_usec = -1; 221 memcpy(&ct->ct_addr, raddr, raddr->sa_len); 222 223 /* 224 * Initialize call message 225 */ 226 getmicrotime(&now); 227 ct->ct_xid = ((uint32_t)++disrupt) ^ __RPC_GETXID(&now); 228 call_msg.rm_xid = ct->ct_xid; 229 call_msg.rm_direction = CALL; 230 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 231 call_msg.rm_call.cb_prog = (uint32_t)prog; 232 call_msg.rm_call.cb_vers = (uint32_t)vers; 233 234 /* 235 * pre-serialize the static part of the call msg and stash it away 236 */ 237 xdrmem_create(&xdrs, ct->ct_mcallc, MCALL_MSG_SIZE, 238 XDR_ENCODE); 239 if (! xdr_callhdr(&xdrs, &call_msg)) { 240 if (ct->ct_closeit) { 241 soclose(ct->ct_socket); 242 } 243 goto err; 244 } 245 ct->ct_mpos = XDR_GETPOS(&xdrs); 246 XDR_DESTROY(&xdrs); 247 ct->ct_waitchan = "rpcrecv"; 248 ct->ct_waitflag = 0; 249 250 /* 251 * Create a client handle which uses xdrrec for serialization 252 * and authnone for authentication. 253 */ 254 sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz); 255 recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz); 256 error = soreserve(ct->ct_socket, sendsz, recvsz); 257 if (error != 0) { 258 if (ct->ct_closeit) { 259 soclose(ct->ct_socket); 260 } 261 goto err; 262 } 263 cl->cl_refs = 1; 264 cl->cl_ops = &clnt_vc_ops; 265 cl->cl_private = ct; 266 cl->cl_auth = authnone_create(); 267 268 SOCKBUF_LOCK(&ct->ct_socket->so_rcv); 269 soupcall_set(ct->ct_socket, SO_RCV, clnt_vc_soupcall, ct); 270 SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv); 271 272 ct->ct_record = NULL; 273 ct->ct_record_resid = 0; 274 TAILQ_INIT(&ct->ct_pending); 275 return (cl); 276 277 err: 278 mtx_destroy(&ct->ct_lock); 279 mem_free(ct, sizeof (struct ct_data)); 280 mem_free(cl, sizeof (CLIENT)); 281 282 return ((CLIENT *)NULL); 283 } 284 285 static enum clnt_stat 286 clnt_vc_call( 287 CLIENT *cl, /* client handle */ 288 struct rpc_callextra *ext, /* call metadata */ 289 rpcproc_t proc, /* procedure number */ 290 struct mbuf *args, /* pointer to args */ 291 struct mbuf **resultsp, /* pointer to results */ 292 struct timeval utimeout) 293 { 294 struct ct_data *ct = (struct ct_data *) cl->cl_private; 295 AUTH *auth; 296 struct rpc_err *errp; 297 enum clnt_stat stat; 298 XDR xdrs; 299 struct rpc_msg reply_msg; 300 bool_t ok; 301 int nrefreshes = 2; /* number of times to refresh cred */ 302 struct timeval timeout; 303 uint32_t xid; 304 struct mbuf *mreq = NULL, *results; 305 struct ct_request *cr; 306 int error, trycnt; 307 308 cr = malloc(sizeof(struct ct_request), M_RPC, M_WAITOK); 309 310 mtx_lock(&ct->ct_lock); 311 312 if (ct->ct_closing || ct->ct_closed) { 313 mtx_unlock(&ct->ct_lock); 314 free(cr, M_RPC); 315 return (RPC_CANTSEND); 316 } 317 ct->ct_threads++; 318 319 if (ext) { 320 auth = ext->rc_auth; 321 errp = &ext->rc_err; 322 } else { 323 auth = cl->cl_auth; 324 errp = &ct->ct_error; 325 } 326 327 cr->cr_mrep = NULL; 328 cr->cr_error = 0; 329 330 if (ct->ct_wait.tv_usec == -1) { 331 timeout = utimeout; /* use supplied timeout */ 332 } else { 333 timeout = ct->ct_wait; /* use default timeout */ 334 } 335 336 /* 337 * After 15sec of looping, allow it to return RPC_CANTSEND, which will 338 * cause the clnt_reconnect layer to create a new TCP connection. 339 */ 340 trycnt = 15 * hz; 341 call_again: 342 mtx_assert(&ct->ct_lock, MA_OWNED); 343 if (ct->ct_closing || ct->ct_closed) { 344 ct->ct_threads--; 345 wakeup(ct); 346 mtx_unlock(&ct->ct_lock); 347 free(cr, M_RPC); 348 return (RPC_CANTSEND); 349 } 350 351 ct->ct_xid++; 352 xid = ct->ct_xid; 353 354 mtx_unlock(&ct->ct_lock); 355 356 /* 357 * Leave space to pre-pend the record mark. 358 */ 359 mreq = m_gethdr(M_WAITOK, MT_DATA); 360 mreq->m_data += sizeof(uint32_t); 361 KASSERT(ct->ct_mpos + sizeof(uint32_t) <= MHLEN, 362 ("RPC header too big")); 363 bcopy(ct->ct_mcallc, mreq->m_data, ct->ct_mpos); 364 mreq->m_len = ct->ct_mpos; 365 366 /* 367 * The XID is the first thing in the request. 368 */ 369 *mtod(mreq, uint32_t *) = htonl(xid); 370 371 xdrmbuf_create(&xdrs, mreq, XDR_ENCODE); 372 373 errp->re_status = stat = RPC_SUCCESS; 374 375 if ((! XDR_PUTINT32(&xdrs, &proc)) || 376 (! AUTH_MARSHALL(auth, xid, &xdrs, 377 m_copym(args, 0, M_COPYALL, M_WAITOK)))) { 378 errp->re_status = stat = RPC_CANTENCODEARGS; 379 mtx_lock(&ct->ct_lock); 380 goto out; 381 } 382 mreq->m_pkthdr.len = m_length(mreq, NULL); 383 384 /* 385 * Prepend a record marker containing the packet length. 386 */ 387 M_PREPEND(mreq, sizeof(uint32_t), M_WAITOK); 388 *mtod(mreq, uint32_t *) = 389 htonl(0x80000000 | (mreq->m_pkthdr.len - sizeof(uint32_t))); 390 391 cr->cr_xid = xid; 392 mtx_lock(&ct->ct_lock); 393 /* 394 * Check to see if the other end has already started to close down 395 * the connection. The upcall will have set ct_error.re_status 396 * to RPC_CANTRECV if this is the case. 397 * If the other end starts to close down the connection after this 398 * point, it will be detected later when cr_error is checked, 399 * since the request is in the ct_pending queue. 400 */ 401 if (ct->ct_error.re_status == RPC_CANTRECV) { 402 if (errp != &ct->ct_error) { 403 errp->re_errno = ct->ct_error.re_errno; 404 errp->re_status = RPC_CANTRECV; 405 } 406 stat = RPC_CANTRECV; 407 goto out; 408 } 409 TAILQ_INSERT_TAIL(&ct->ct_pending, cr, cr_link); 410 mtx_unlock(&ct->ct_lock); 411 412 /* 413 * sosend consumes mreq. 414 */ 415 error = sosend(ct->ct_socket, NULL, NULL, mreq, NULL, 0, curthread); 416 mreq = NULL; 417 if (error == EMSGSIZE || (error == ERESTART && 418 (ct->ct_waitflag & PCATCH) == 0 && trycnt-- > 0)) { 419 SOCKBUF_LOCK(&ct->ct_socket->so_snd); 420 sbwait(&ct->ct_socket->so_snd); 421 SOCKBUF_UNLOCK(&ct->ct_socket->so_snd); 422 AUTH_VALIDATE(auth, xid, NULL, NULL); 423 mtx_lock(&ct->ct_lock); 424 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 425 /* Sleep for 1 clock tick before trying the sosend() again. */ 426 msleep(&fake_wchan, &ct->ct_lock, 0, "rpclpsnd", 1); 427 goto call_again; 428 } 429 430 reply_msg.acpted_rply.ar_verf.oa_flavor = AUTH_NULL; 431 reply_msg.acpted_rply.ar_verf.oa_base = cr->cr_verf; 432 reply_msg.acpted_rply.ar_verf.oa_length = 0; 433 reply_msg.acpted_rply.ar_results.where = NULL; 434 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void; 435 436 mtx_lock(&ct->ct_lock); 437 if (error) { 438 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 439 errp->re_errno = error; 440 errp->re_status = stat = RPC_CANTSEND; 441 goto out; 442 } 443 444 /* 445 * Check to see if we got an upcall while waiting for the 446 * lock. In both these cases, the request has been removed 447 * from ct->ct_pending. 448 */ 449 if (cr->cr_error) { 450 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 451 errp->re_errno = cr->cr_error; 452 errp->re_status = stat = RPC_CANTRECV; 453 goto out; 454 } 455 if (cr->cr_mrep) { 456 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 457 goto got_reply; 458 } 459 460 /* 461 * Hack to provide rpc-based message passing 462 */ 463 if (timeout.tv_sec == 0 && timeout.tv_usec == 0) { 464 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 465 errp->re_status = stat = RPC_TIMEDOUT; 466 goto out; 467 } 468 469 error = msleep(cr, &ct->ct_lock, ct->ct_waitflag, ct->ct_waitchan, 470 tvtohz(&timeout)); 471 472 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 473 474 if (error) { 475 /* 476 * The sleep returned an error so our request is still 477 * on the list. Turn the error code into an 478 * appropriate client status. 479 */ 480 errp->re_errno = error; 481 switch (error) { 482 case EINTR: 483 stat = RPC_INTR; 484 break; 485 case EWOULDBLOCK: 486 stat = RPC_TIMEDOUT; 487 break; 488 default: 489 stat = RPC_CANTRECV; 490 } 491 errp->re_status = stat; 492 goto out; 493 } else { 494 /* 495 * We were woken up by the upcall. If the 496 * upcall had a receive error, report that, 497 * otherwise we have a reply. 498 */ 499 if (cr->cr_error) { 500 errp->re_errno = cr->cr_error; 501 errp->re_status = stat = RPC_CANTRECV; 502 goto out; 503 } 504 } 505 506 got_reply: 507 /* 508 * Now decode and validate the response. We need to drop the 509 * lock since xdr_replymsg may end up sleeping in malloc. 510 */ 511 mtx_unlock(&ct->ct_lock); 512 513 if (ext && ext->rc_feedback) 514 ext->rc_feedback(FEEDBACK_OK, proc, ext->rc_feedback_arg); 515 516 xdrmbuf_create(&xdrs, cr->cr_mrep, XDR_DECODE); 517 ok = xdr_replymsg(&xdrs, &reply_msg); 518 cr->cr_mrep = NULL; 519 520 if (ok) { 521 if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) && 522 (reply_msg.acpted_rply.ar_stat == SUCCESS)) 523 errp->re_status = stat = RPC_SUCCESS; 524 else 525 stat = _seterr_reply(&reply_msg, errp); 526 527 if (stat == RPC_SUCCESS) { 528 results = xdrmbuf_getall(&xdrs); 529 if (!AUTH_VALIDATE(auth, xid, 530 &reply_msg.acpted_rply.ar_verf, 531 &results)) { 532 errp->re_status = stat = RPC_AUTHERROR; 533 errp->re_why = AUTH_INVALIDRESP; 534 } else { 535 KASSERT(results, 536 ("auth validated but no result")); 537 *resultsp = results; 538 } 539 } /* end successful completion */ 540 /* 541 * If unsuccessful AND error is an authentication error 542 * then refresh credentials and try again, else break 543 */ 544 else if (stat == RPC_AUTHERROR) 545 /* maybe our credentials need to be refreshed ... */ 546 if (nrefreshes > 0 && 547 AUTH_REFRESH(auth, &reply_msg)) { 548 nrefreshes--; 549 XDR_DESTROY(&xdrs); 550 mtx_lock(&ct->ct_lock); 551 goto call_again; 552 } 553 /* end of unsuccessful completion */ 554 } /* end of valid reply message */ 555 else { 556 errp->re_status = stat = RPC_CANTDECODERES; 557 } 558 XDR_DESTROY(&xdrs); 559 mtx_lock(&ct->ct_lock); 560 out: 561 mtx_assert(&ct->ct_lock, MA_OWNED); 562 563 KASSERT(stat != RPC_SUCCESS || *resultsp, 564 ("RPC_SUCCESS without reply")); 565 566 if (mreq) 567 m_freem(mreq); 568 if (cr->cr_mrep) 569 m_freem(cr->cr_mrep); 570 571 ct->ct_threads--; 572 if (ct->ct_closing) 573 wakeup(ct); 574 575 mtx_unlock(&ct->ct_lock); 576 577 if (auth && stat != RPC_SUCCESS) 578 AUTH_VALIDATE(auth, xid, NULL, NULL); 579 580 free(cr, M_RPC); 581 582 return (stat); 583 } 584 585 static void 586 clnt_vc_geterr(CLIENT *cl, struct rpc_err *errp) 587 { 588 struct ct_data *ct = (struct ct_data *) cl->cl_private; 589 590 *errp = ct->ct_error; 591 } 592 593 static bool_t 594 clnt_vc_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr) 595 { 596 XDR xdrs; 597 bool_t dummy; 598 599 xdrs.x_op = XDR_FREE; 600 dummy = (*xdr_res)(&xdrs, res_ptr); 601 602 return (dummy); 603 } 604 605 /*ARGSUSED*/ 606 static void 607 clnt_vc_abort(CLIENT *cl) 608 { 609 } 610 611 static bool_t 612 clnt_vc_control(CLIENT *cl, u_int request, void *info) 613 { 614 struct ct_data *ct = (struct ct_data *)cl->cl_private; 615 void *infop = info; 616 SVCXPRT *xprt; 617 618 mtx_lock(&ct->ct_lock); 619 620 switch (request) { 621 case CLSET_FD_CLOSE: 622 ct->ct_closeit = TRUE; 623 mtx_unlock(&ct->ct_lock); 624 return (TRUE); 625 case CLSET_FD_NCLOSE: 626 ct->ct_closeit = FALSE; 627 mtx_unlock(&ct->ct_lock); 628 return (TRUE); 629 default: 630 break; 631 } 632 633 /* for other requests which use info */ 634 if (info == NULL) { 635 mtx_unlock(&ct->ct_lock); 636 return (FALSE); 637 } 638 switch (request) { 639 case CLSET_TIMEOUT: 640 if (time_not_ok((struct timeval *)info)) { 641 mtx_unlock(&ct->ct_lock); 642 return (FALSE); 643 } 644 ct->ct_wait = *(struct timeval *)infop; 645 break; 646 case CLGET_TIMEOUT: 647 *(struct timeval *)infop = ct->ct_wait; 648 break; 649 case CLGET_SERVER_ADDR: 650 (void) memcpy(info, &ct->ct_addr, (size_t)ct->ct_addr.ss_len); 651 break; 652 case CLGET_SVC_ADDR: 653 /* 654 * Slightly different semantics to userland - we use 655 * sockaddr instead of netbuf. 656 */ 657 memcpy(info, &ct->ct_addr, ct->ct_addr.ss_len); 658 break; 659 case CLSET_SVC_ADDR: /* set to new address */ 660 mtx_unlock(&ct->ct_lock); 661 return (FALSE); 662 case CLGET_XID: 663 *(uint32_t *)info = ct->ct_xid; 664 break; 665 case CLSET_XID: 666 /* This will set the xid of the NEXT call */ 667 /* decrement by 1 as clnt_vc_call() increments once */ 668 ct->ct_xid = *(uint32_t *)info - 1; 669 break; 670 case CLGET_VERS: 671 /* 672 * This RELIES on the information that, in the call body, 673 * the version number field is the fifth field from the 674 * beginning of the RPC header. MUST be changed if the 675 * call_struct is changed 676 */ 677 *(uint32_t *)info = 678 ntohl(*(uint32_t *)(void *)(ct->ct_mcallc + 679 4 * BYTES_PER_XDR_UNIT)); 680 break; 681 682 case CLSET_VERS: 683 *(uint32_t *)(void *)(ct->ct_mcallc + 684 4 * BYTES_PER_XDR_UNIT) = 685 htonl(*(uint32_t *)info); 686 break; 687 688 case CLGET_PROG: 689 /* 690 * This RELIES on the information that, in the call body, 691 * the program number field is the fourth field from the 692 * beginning of the RPC header. MUST be changed if the 693 * call_struct is changed 694 */ 695 *(uint32_t *)info = 696 ntohl(*(uint32_t *)(void *)(ct->ct_mcallc + 697 3 * BYTES_PER_XDR_UNIT)); 698 break; 699 700 case CLSET_PROG: 701 *(uint32_t *)(void *)(ct->ct_mcallc + 702 3 * BYTES_PER_XDR_UNIT) = 703 htonl(*(uint32_t *)info); 704 break; 705 706 case CLSET_WAITCHAN: 707 ct->ct_waitchan = (const char *)info; 708 break; 709 710 case CLGET_WAITCHAN: 711 *(const char **) info = ct->ct_waitchan; 712 break; 713 714 case CLSET_INTERRUPTIBLE: 715 if (*(int *) info) 716 ct->ct_waitflag = PCATCH; 717 else 718 ct->ct_waitflag = 0; 719 break; 720 721 case CLGET_INTERRUPTIBLE: 722 if (ct->ct_waitflag) 723 *(int *) info = TRUE; 724 else 725 *(int *) info = FALSE; 726 break; 727 728 case CLSET_BACKCHANNEL: 729 xprt = (SVCXPRT *)info; 730 if (ct->ct_backchannelxprt == NULL) { 731 xprt->xp_p2 = ct; 732 ct->ct_backchannelxprt = xprt; 733 } 734 break; 735 736 default: 737 mtx_unlock(&ct->ct_lock); 738 return (FALSE); 739 } 740 741 mtx_unlock(&ct->ct_lock); 742 return (TRUE); 743 } 744 745 static void 746 clnt_vc_close(CLIENT *cl) 747 { 748 struct ct_data *ct = (struct ct_data *) cl->cl_private; 749 struct ct_request *cr; 750 751 mtx_lock(&ct->ct_lock); 752 753 if (ct->ct_closed) { 754 mtx_unlock(&ct->ct_lock); 755 return; 756 } 757 758 if (ct->ct_closing) { 759 while (ct->ct_closing) 760 msleep(ct, &ct->ct_lock, 0, "rpcclose", 0); 761 KASSERT(ct->ct_closed, ("client should be closed")); 762 mtx_unlock(&ct->ct_lock); 763 return; 764 } 765 766 if (ct->ct_socket) { 767 ct->ct_closing = TRUE; 768 mtx_unlock(&ct->ct_lock); 769 770 SOCKBUF_LOCK(&ct->ct_socket->so_rcv); 771 soupcall_clear(ct->ct_socket, SO_RCV); 772 clnt_vc_upcallsdone(ct); 773 SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv); 774 775 /* 776 * Abort any pending requests and wait until everyone 777 * has finished with clnt_vc_call. 778 */ 779 mtx_lock(&ct->ct_lock); 780 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) { 781 cr->cr_xid = 0; 782 cr->cr_error = ESHUTDOWN; 783 wakeup(cr); 784 } 785 786 while (ct->ct_threads) 787 msleep(ct, &ct->ct_lock, 0, "rpcclose", 0); 788 } 789 790 ct->ct_closing = FALSE; 791 ct->ct_closed = TRUE; 792 mtx_unlock(&ct->ct_lock); 793 wakeup(ct); 794 } 795 796 static void 797 clnt_vc_destroy(CLIENT *cl) 798 { 799 struct ct_data *ct = (struct ct_data *) cl->cl_private; 800 struct socket *so = NULL; 801 SVCXPRT *xprt; 802 803 clnt_vc_close(cl); 804 805 mtx_lock(&ct->ct_lock); 806 xprt = ct->ct_backchannelxprt; 807 ct->ct_backchannelxprt = NULL; 808 if (xprt != NULL) { 809 mtx_unlock(&ct->ct_lock); /* To avoid a LOR. */ 810 sx_xlock(&xprt->xp_lock); 811 mtx_lock(&ct->ct_lock); 812 xprt->xp_p2 = NULL; 813 sx_xunlock(&xprt->xp_lock); 814 } 815 816 if (ct->ct_socket) { 817 if (ct->ct_closeit) { 818 so = ct->ct_socket; 819 } 820 } 821 822 mtx_unlock(&ct->ct_lock); 823 824 mtx_destroy(&ct->ct_lock); 825 if (so) { 826 soshutdown(so, SHUT_WR); 827 soclose(so); 828 } 829 mem_free(ct, sizeof(struct ct_data)); 830 if (cl->cl_netid && cl->cl_netid[0]) 831 mem_free(cl->cl_netid, strlen(cl->cl_netid) +1); 832 if (cl->cl_tp && cl->cl_tp[0]) 833 mem_free(cl->cl_tp, strlen(cl->cl_tp) +1); 834 mem_free(cl, sizeof(CLIENT)); 835 } 836 837 /* 838 * Make sure that the time is not garbage. -1 value is disallowed. 839 * Note this is different from time_not_ok in clnt_dg.c 840 */ 841 static bool_t 842 time_not_ok(struct timeval *t) 843 { 844 return (t->tv_sec <= -1 || t->tv_sec > 100000000 || 845 t->tv_usec <= -1 || t->tv_usec > 1000000); 846 } 847 848 int 849 clnt_vc_soupcall(struct socket *so, void *arg, int waitflag) 850 { 851 struct ct_data *ct = (struct ct_data *) arg; 852 struct uio uio; 853 struct mbuf *m, *m2; 854 struct ct_request *cr; 855 int error, rcvflag, foundreq; 856 uint32_t xid_plus_direction[2], header; 857 bool_t do_read; 858 SVCXPRT *xprt; 859 struct cf_conn *cd; 860 861 CTASSERT(sizeof(xid_plus_direction) == 2 * sizeof(uint32_t)); 862 ct->ct_upcallrefs++; 863 uio.uio_td = curthread; 864 do { 865 /* 866 * If ct_record_resid is zero, we are waiting for a 867 * record mark. 868 */ 869 if (ct->ct_record_resid == 0) { 870 871 /* 872 * Make sure there is either a whole record 873 * mark in the buffer or there is some other 874 * error condition 875 */ 876 do_read = FALSE; 877 if (sbavail(&so->so_rcv) >= sizeof(uint32_t) 878 || (so->so_rcv.sb_state & SBS_CANTRCVMORE) 879 || so->so_error) 880 do_read = TRUE; 881 882 if (!do_read) 883 break; 884 885 SOCKBUF_UNLOCK(&so->so_rcv); 886 uio.uio_resid = sizeof(uint32_t); 887 m = NULL; 888 rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK; 889 error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag); 890 SOCKBUF_LOCK(&so->so_rcv); 891 892 if (error == EWOULDBLOCK) 893 break; 894 895 /* 896 * If there was an error, wake up all pending 897 * requests. 898 */ 899 if (error || uio.uio_resid > 0) { 900 wakeup_all: 901 mtx_lock(&ct->ct_lock); 902 if (!error) { 903 /* 904 * We must have got EOF trying 905 * to read from the stream. 906 */ 907 error = ECONNRESET; 908 } 909 ct->ct_error.re_status = RPC_CANTRECV; 910 ct->ct_error.re_errno = error; 911 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) { 912 cr->cr_error = error; 913 wakeup(cr); 914 } 915 mtx_unlock(&ct->ct_lock); 916 break; 917 } 918 m_copydata(m, 0, sizeof(uint32_t), (char *)&header); 919 header = ntohl(header); 920 ct->ct_record = NULL; 921 ct->ct_record_resid = header & 0x7fffffff; 922 ct->ct_record_eor = ((header & 0x80000000) != 0); 923 m_freem(m); 924 } else { 925 /* 926 * Wait until the socket has the whole record 927 * buffered. 928 */ 929 do_read = FALSE; 930 if (sbavail(&so->so_rcv) >= ct->ct_record_resid 931 || (so->so_rcv.sb_state & SBS_CANTRCVMORE) 932 || so->so_error) 933 do_read = TRUE; 934 935 if (!do_read) 936 break; 937 938 /* 939 * We have the record mark. Read as much as 940 * the socket has buffered up to the end of 941 * this record. 942 */ 943 SOCKBUF_UNLOCK(&so->so_rcv); 944 uio.uio_resid = ct->ct_record_resid; 945 m = NULL; 946 rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK; 947 error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag); 948 SOCKBUF_LOCK(&so->so_rcv); 949 950 if (error == EWOULDBLOCK) 951 break; 952 953 if (error || uio.uio_resid == ct->ct_record_resid) 954 goto wakeup_all; 955 956 /* 957 * If we have part of the record already, 958 * chain this bit onto the end. 959 */ 960 if (ct->ct_record) 961 m_last(ct->ct_record)->m_next = m; 962 else 963 ct->ct_record = m; 964 965 ct->ct_record_resid = uio.uio_resid; 966 967 /* 968 * If we have the entire record, see if we can 969 * match it to a request. 970 */ 971 if (ct->ct_record_resid == 0 972 && ct->ct_record_eor) { 973 /* 974 * The XID is in the first uint32_t of 975 * the reply and the message direction 976 * is the second one. 977 */ 978 if (ct->ct_record->m_len < 979 sizeof(xid_plus_direction) && 980 m_length(ct->ct_record, NULL) < 981 sizeof(xid_plus_direction)) { 982 m_freem(ct->ct_record); 983 break; 984 } 985 m_copydata(ct->ct_record, 0, 986 sizeof(xid_plus_direction), 987 (char *)xid_plus_direction); 988 xid_plus_direction[0] = 989 ntohl(xid_plus_direction[0]); 990 xid_plus_direction[1] = 991 ntohl(xid_plus_direction[1]); 992 /* Check message direction. */ 993 if (xid_plus_direction[1] == CALL) { 994 /* This is a backchannel request. */ 995 mtx_lock(&ct->ct_lock); 996 xprt = ct->ct_backchannelxprt; 997 if (xprt == NULL) { 998 mtx_unlock(&ct->ct_lock); 999 /* Just throw it away. */ 1000 m_freem(ct->ct_record); 1001 ct->ct_record = NULL; 1002 } else { 1003 cd = (struct cf_conn *) 1004 xprt->xp_p1; 1005 m2 = cd->mreq; 1006 /* 1007 * The requests are chained 1008 * in the m_nextpkt list. 1009 */ 1010 while (m2 != NULL && 1011 m2->m_nextpkt != NULL) 1012 /* Find end of list. */ 1013 m2 = m2->m_nextpkt; 1014 if (m2 != NULL) 1015 m2->m_nextpkt = 1016 ct->ct_record; 1017 else 1018 cd->mreq = 1019 ct->ct_record; 1020 ct->ct_record->m_nextpkt = 1021 NULL; 1022 ct->ct_record = NULL; 1023 xprt_active(xprt); 1024 mtx_unlock(&ct->ct_lock); 1025 } 1026 } else { 1027 mtx_lock(&ct->ct_lock); 1028 foundreq = 0; 1029 TAILQ_FOREACH(cr, &ct->ct_pending, 1030 cr_link) { 1031 if (cr->cr_xid == 1032 xid_plus_direction[0]) { 1033 /* 1034 * This one 1035 * matches. We leave 1036 * the reply mbuf in 1037 * cr->cr_mrep. Set 1038 * the XID to zero so 1039 * that we will ignore 1040 * any duplicated 1041 * replies. 1042 */ 1043 cr->cr_xid = 0; 1044 cr->cr_mrep = 1045 ct->ct_record; 1046 cr->cr_error = 0; 1047 foundreq = 1; 1048 wakeup(cr); 1049 break; 1050 } 1051 } 1052 mtx_unlock(&ct->ct_lock); 1053 1054 if (!foundreq) 1055 m_freem(ct->ct_record); 1056 ct->ct_record = NULL; 1057 } 1058 } 1059 } 1060 } while (m); 1061 ct->ct_upcallrefs--; 1062 if (ct->ct_upcallrefs < 0) 1063 panic("rpcvc upcall refcnt"); 1064 if (ct->ct_upcallrefs == 0) 1065 wakeup(&ct->ct_upcallrefs); 1066 return (SU_OK); 1067 } 1068 1069 /* 1070 * Wait for all upcalls in progress to complete. 1071 */ 1072 static void 1073 clnt_vc_upcallsdone(struct ct_data *ct) 1074 { 1075 1076 SOCKBUF_LOCK_ASSERT(&ct->ct_socket->so_rcv); 1077 1078 while (ct->ct_upcallrefs > 0) 1079 (void) msleep(&ct->ct_upcallrefs, 1080 SOCKBUF_MTX(&ct->ct_socket->so_rcv), 0, "rpcvcup", 0); 1081 }
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