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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 * Copyright (c) 2009, Sun Microsystems, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * - Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * - Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * - Neither the name of Sun Microsystems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #if defined(LIBC_SCCS) && !defined(lint) 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"; 35 #endif 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 /* 40 * clnt_tcp.c, Implements a TCP/IP based, client side RPC. 41 * 42 * Copyright (C) 1984, Sun Microsystems, Inc. 43 * 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). 49 * 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.... 54 * 55 * Now go hang yourself. 56 */ 57 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <sys/lock.h> 61 #include <sys/malloc.h> 62 #include <sys/mbuf.h> 63 #include <sys/mutex.h> 64 #include <sys/pcpu.h> 65 #include <sys/proc.h> 66 #include <sys/protosw.h> 67 #include <sys/socket.h> 68 #include <sys/socketvar.h> 69 #include <sys/sx.h> 70 #include <sys/syslog.h> 71 #include <sys/time.h> 72 #include <sys/uio.h> 73 74 #include <net/vnet.h> 75 76 #include <netinet/tcp.h> 77 78 #include <rpc/rpc.h> 79 #include <rpc/rpc_com.h> 80 #include <rpc/krpc.h> 81 82 struct cmessage { 83 struct cmsghdr cmsg; 84 struct cmsgcred cmcred; 85 }; 86 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); 97 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 106 }; 107 108 static void clnt_vc_upcallsdone(struct ct_data *); 109 110 /* 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. 118 * 119 * fd should be an open socket 120 */ 121 CLIENT * 122 clnt_vc_create( 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 */ 130 { 131 CLIENT *cl; /* client handle */ 132 struct ct_data *ct = NULL; /* client handle */ 133 struct timeval now; 134 struct rpc_msg call_msg; 135 static uint32_t disrupt; 136 struct __rpc_sockinfo si; 137 XDR xdrs; 138 int error, interrupted, one = 1, sleep_flag; 139 struct sockopt sopt; 140 141 if (disrupt == 0) 142 disrupt = (uint32_t)(long)raddr; 143 144 cl = (CLIENT *)mem_alloc(sizeof (*cl)); 145 ct = (struct ct_data *)mem_alloc(sizeof (*ct)); 146 147 mtx_init(&ct->ct_lock, "ct->ct_lock", NULL, MTX_DEF); 148 ct->ct_threads = 0; 149 ct->ct_closing = FALSE; 150 ct->ct_closed = FALSE; 151 ct->ct_upcallrefs = 0; 152 153 if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { 154 error = soconnect(so, raddr, curthread); 155 SOCK_LOCK(so); 156 interrupted = 0; 157 sleep_flag = PSOCK; 158 if (intrflag != 0) 159 sleep_flag |= (PCATCH | PBDRY); 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); 164 if (error) { 165 if (error == EINTR || error == ERESTART) 166 interrupted = 1; 167 break; 168 } 169 } 170 if (error == 0) { 171 error = so->so_error; 172 so->so_error = 0; 173 } 174 SOCK_UNLOCK(so); 175 if (error) { 176 if (!interrupted) 177 so->so_state &= ~SS_ISCONNECTING; 178 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 179 rpc_createerr.cf_error.re_errno = error; 180 goto err; 181 } 182 } 183 184 if (!__rpc_socket2sockinfo(so, &si)) { 185 goto err; 186 } 187 188 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); 195 sosetopt(so, &sopt); 196 } 197 198 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); 205 sosetopt(so, &sopt); 206 } 207 208 ct->ct_closeit = FALSE; 209 210 /* 211 * Set up private data struct 212 */ 213 ct->ct_socket = so; 214 ct->ct_wait.tv_sec = -1; 215 ct->ct_wait.tv_usec = -1; 216 memcpy(&ct->ct_addr, raddr, raddr->sa_len); 217 218 /* 219 * Initialize call message 220 */ 221 getmicrotime(&now); 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; 228 229 /* 230 * pre-serialize the static part of the call msg and stash it away 231 */ 232 xdrmem_create(&xdrs, ct->ct_mcallc, MCALL_MSG_SIZE, 233 XDR_ENCODE); 234 if (! xdr_callhdr(&xdrs, &call_msg)) { 235 if (ct->ct_closeit) { 236 soclose(ct->ct_socket); 237 } 238 goto err; 239 } 240 ct->ct_mpos = XDR_GETPOS(&xdrs); 241 XDR_DESTROY(&xdrs); 242 ct->ct_waitchan = "rpcrecv"; 243 ct->ct_waitflag = 0; 244 245 /* 246 * Create a client handle which uses xdrrec for serialization 247 * and authnone for authentication. 248 */ 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); 252 if (error != 0) { 253 if (ct->ct_closeit) { 254 soclose(ct->ct_socket); 255 } 256 goto err; 257 } 258 cl->cl_refs = 1; 259 cl->cl_ops = &clnt_vc_ops; 260 cl->cl_private = ct; 261 cl->cl_auth = authnone_create(); 262 263 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); 266 267 ct->ct_record = NULL; 268 ct->ct_record_resid = 0; 269 TAILQ_INIT(&ct->ct_pending); 270 return (cl); 271 272 err: 273 mtx_destroy(&ct->ct_lock); 274 mem_free(ct, sizeof (struct ct_data)); 275 mem_free(cl, sizeof (CLIENT)); 276 277 return ((CLIENT *)NULL); 278 } 279 280 static enum clnt_stat 281 clnt_vc_call( 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) 288 { 289 struct ct_data *ct = (struct ct_data *) cl->cl_private; 290 AUTH *auth; 291 struct rpc_err *errp; 292 enum clnt_stat stat; 293 XDR xdrs; 294 struct rpc_msg reply_msg; 295 bool_t ok; 296 int nrefreshes = 2; /* number of times to refresh cred */ 297 struct timeval timeout; 298 uint32_t xid; 299 struct mbuf *mreq = NULL, *results; 300 struct ct_request *cr; 301 int error; 302 303 cr = malloc(sizeof(struct ct_request), M_RPC, M_WAITOK); 304 305 mtx_lock(&ct->ct_lock); 306 307 if (ct->ct_closing || ct->ct_closed) { 308 mtx_unlock(&ct->ct_lock); 309 free(cr, M_RPC); 310 return (RPC_CANTSEND); 311 } 312 ct->ct_threads++; 313 314 if (ext) { 315 auth = ext->rc_auth; 316 errp = &ext->rc_err; 317 } else { 318 auth = cl->cl_auth; 319 errp = &ct->ct_error; 320 } 321 322 cr->cr_mrep = NULL; 323 cr->cr_error = 0; 324 325 if (ct->ct_wait.tv_usec == -1) { 326 timeout = utimeout; /* use supplied timeout */ 327 } else { 328 timeout = ct->ct_wait; /* use default timeout */ 329 } 330 331 call_again: 332 mtx_assert(&ct->ct_lock, MA_OWNED); 333 334 ct->ct_xid++; 335 xid = ct->ct_xid; 336 337 mtx_unlock(&ct->ct_lock); 338 339 /* 340 * Leave space to pre-pend the record mark. 341 */ 342 MGETHDR(mreq, M_WAIT, 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; 348 349 /* 350 * The XID is the first thing in the request. 351 */ 352 *mtod(mreq, uint32_t *) = htonl(xid); 353 354 xdrmbuf_create(&xdrs, mreq, XDR_ENCODE); 355 356 errp->re_status = stat = RPC_SUCCESS; 357 358 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); 363 goto out; 364 } 365 mreq->m_pkthdr.len = m_length(mreq, NULL); 366 367 /* 368 * Prepend a record marker containing the packet length. 369 */ 370 M_PREPEND(mreq, sizeof(uint32_t), M_WAIT); 371 *mtod(mreq, uint32_t *) = 372 htonl(0x80000000 | (mreq->m_pkthdr.len - sizeof(uint32_t))); 373 374 cr->cr_xid = xid; 375 mtx_lock(&ct->ct_lock); 376 /* 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. 383 */ 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; 388 } 389 stat = RPC_CANTRECV; 390 goto out; 391 } 392 TAILQ_INSERT_TAIL(&ct->ct_pending, cr, cr_link); 393 mtx_unlock(&ct->ct_lock); 394 395 /* 396 * sosend consumes mreq. 397 */ 398 error = sosend(ct->ct_socket, NULL, NULL, mreq, NULL, 0, curthread); 399 mreq = NULL; 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); 407 goto call_again; 408 } 409 410 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; 415 416 mtx_lock(&ct->ct_lock); 417 if (error) { 418 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 419 errp->re_errno = error; 420 errp->re_status = stat = RPC_CANTSEND; 421 goto out; 422 } 423 424 /* 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. 428 */ 429 if (cr->cr_error) { 430 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 431 errp->re_errno = cr->cr_error; 432 errp->re_status = stat = RPC_CANTRECV; 433 goto out; 434 } 435 if (cr->cr_mrep) { 436 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 437 goto got_reply; 438 } 439 440 /* 441 * Hack to provide rpc-based message passing 442 */ 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; 446 goto out; 447 } 448 449 error = msleep(cr, &ct->ct_lock, ct->ct_waitflag, ct->ct_waitchan, 450 tvtohz(&timeout)); 451 452 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link); 453 454 if (error) { 455 /* 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. 459 */ 460 errp->re_errno = error; 461 switch (error) { 462 case EINTR: 463 case ERESTART: 464 stat = RPC_INTR; 465 break; 466 case EWOULDBLOCK: 467 stat = RPC_TIMEDOUT; 468 break; 469 default: 470 stat = RPC_CANTRECV; 471 } 472 errp->re_status = stat; 473 goto out; 474 } else { 475 /* 476 * We were woken up by the upcall. If the 477 * upcall had a receive error, report that, 478 * otherwise we have a reply. 479 */ 480 if (cr->cr_error) { 481 errp->re_errno = cr->cr_error; 482 errp->re_status = stat = RPC_CANTRECV; 483 goto out; 484 } 485 } 486 487 got_reply: 488 /* 489 * Now decode and validate the response. We need to drop the 490 * lock since xdr_replymsg may end up sleeping in malloc. 491 */ 492 mtx_unlock(&ct->ct_lock); 493 494 if (ext && ext->rc_feedback) 495 ext->rc_feedback(FEEDBACK_OK, proc, ext->rc_feedback_arg); 496 497 xdrmbuf_create(&xdrs, cr->cr_mrep, XDR_DECODE); 498 ok = xdr_replymsg(&xdrs, &reply_msg); 499 cr->cr_mrep = NULL; 500 501 if (ok) { 502 if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) && 503 (reply_msg.acpted_rply.ar_stat == SUCCESS)) 504 errp->re_status = stat = RPC_SUCCESS; 505 else 506 stat = _seterr_reply(&reply_msg, errp); 507 508 if (stat == RPC_SUCCESS) { 509 results = xdrmbuf_getall(&xdrs); 510 if (!AUTH_VALIDATE(auth, xid, 511 &reply_msg.acpted_rply.ar_verf, 512 &results)) { 513 errp->re_status = stat = RPC_AUTHERROR; 514 errp->re_why = AUTH_INVALIDRESP; 515 } else { 516 KASSERT(results, 517 ("auth validated but no result")); 518 *resultsp = results; 519 } 520 } /* end successful completion */ 521 /* 522 * If unsuccesful AND error is an authentication error 523 * then refresh credentials and try again, else break 524 */ 525 else if (stat == RPC_AUTHERROR) 526 /* maybe our credentials need to be refreshed ... */ 527 if (nrefreshes > 0 && 528 AUTH_REFRESH(auth, &reply_msg)) { 529 nrefreshes--; 530 XDR_DESTROY(&xdrs); 531 mtx_lock(&ct->ct_lock); 532 goto call_again; 533 } 534 /* end of unsuccessful completion */ 535 } /* end of valid reply message */ 536 else { 537 errp->re_status = stat = RPC_CANTDECODERES; 538 } 539 XDR_DESTROY(&xdrs); 540 mtx_lock(&ct->ct_lock); 541 out: 542 mtx_assert(&ct->ct_lock, MA_OWNED); 543 544 KASSERT(stat != RPC_SUCCESS || *resultsp, 545 ("RPC_SUCCESS without reply")); 546 547 if (mreq) 548 m_freem(mreq); 549 if (cr->cr_mrep) 550 m_freem(cr->cr_mrep); 551 552 ct->ct_threads--; 553 if (ct->ct_closing) 554 wakeup(ct); 555 556 mtx_unlock(&ct->ct_lock); 557 558 if (auth && stat != RPC_SUCCESS) 559 AUTH_VALIDATE(auth, xid, NULL, NULL); 560 561 free(cr, M_RPC); 562 563 return (stat); 564 } 565 566 static void 567 clnt_vc_geterr(CLIENT *cl, struct rpc_err *errp) 568 { 569 struct ct_data *ct = (struct ct_data *) cl->cl_private; 570 571 *errp = ct->ct_error; 572 } 573 574 static bool_t 575 clnt_vc_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr) 576 { 577 XDR xdrs; 578 bool_t dummy; 579 580 xdrs.x_op = XDR_FREE; 581 dummy = (*xdr_res)(&xdrs, res_ptr); 582 583 return (dummy); 584 } 585 586 /*ARGSUSED*/ 587 static void 588 clnt_vc_abort(CLIENT *cl) 589 { 590 } 591 592 static bool_t 593 clnt_vc_control(CLIENT *cl, u_int request, void *info) 594 { 595 struct ct_data *ct = (struct ct_data *)cl->cl_private; 596 void *infop = info; 597 SVCXPRT *xprt; 598 599 mtx_lock(&ct->ct_lock); 600 601 switch (request) { 602 case CLSET_FD_CLOSE: 603 ct->ct_closeit = TRUE; 604 mtx_unlock(&ct->ct_lock); 605 return (TRUE); 606 case CLSET_FD_NCLOSE: 607 ct->ct_closeit = FALSE; 608 mtx_unlock(&ct->ct_lock); 609 return (TRUE); 610 default: 611 break; 612 } 613 614 /* for other requests which use info */ 615 if (info == NULL) { 616 mtx_unlock(&ct->ct_lock); 617 return (FALSE); 618 } 619 switch (request) { 620 case CLSET_TIMEOUT: 621 if (time_not_ok((struct timeval *)info)) { 622 mtx_unlock(&ct->ct_lock); 623 return (FALSE); 624 } 625 ct->ct_wait = *(struct timeval *)infop; 626 break; 627 case CLGET_TIMEOUT: 628 *(struct timeval *)infop = ct->ct_wait; 629 break; 630 case CLGET_SERVER_ADDR: 631 (void) memcpy(info, &ct->ct_addr, (size_t)ct->ct_addr.ss_len); 632 break; 633 case CLGET_SVC_ADDR: 634 /* 635 * Slightly different semantics to userland - we use 636 * sockaddr instead of netbuf. 637 */ 638 memcpy(info, &ct->ct_addr, ct->ct_addr.ss_len); 639 break; 640 case CLSET_SVC_ADDR: /* set to new address */ 641 mtx_unlock(&ct->ct_lock); 642 return (FALSE); 643 case CLGET_XID: 644 *(uint32_t *)info = ct->ct_xid; 645 break; 646 case CLSET_XID: 647 /* This will set the xid of the NEXT call */ 648 /* decrement by 1 as clnt_vc_call() increments once */ 649 ct->ct_xid = *(uint32_t *)info - 1; 650 break; 651 case CLGET_VERS: 652 /* 653 * This RELIES on the information that, in the call body, 654 * the version number field is the fifth field from the 655 * begining of the RPC header. MUST be changed if the 656 * call_struct is changed 657 */ 658 *(uint32_t *)info = 659 ntohl(*(uint32_t *)(void *)(ct->ct_mcallc + 660 4 * BYTES_PER_XDR_UNIT)); 661 break; 662 663 case CLSET_VERS: 664 *(uint32_t *)(void *)(ct->ct_mcallc + 665 4 * BYTES_PER_XDR_UNIT) = 666 htonl(*(uint32_t *)info); 667 break; 668 669 case CLGET_PROG: 670 /* 671 * This RELIES on the information that, in the call body, 672 * the program number field is the fourth field from the 673 * begining of the RPC header. MUST be changed if the 674 * call_struct is changed 675 */ 676 *(uint32_t *)info = 677 ntohl(*(uint32_t *)(void *)(ct->ct_mcallc + 678 3 * BYTES_PER_XDR_UNIT)); 679 break; 680 681 case CLSET_PROG: 682 *(uint32_t *)(void *)(ct->ct_mcallc + 683 3 * BYTES_PER_XDR_UNIT) = 684 htonl(*(uint32_t *)info); 685 break; 686 687 case CLSET_WAITCHAN: 688 ct->ct_waitchan = (const char *)info; 689 break; 690 691 case CLGET_WAITCHAN: 692 *(const char **) info = ct->ct_waitchan; 693 break; 694 695 case CLSET_INTERRUPTIBLE: 696 if (*(int *) info) 697 ct->ct_waitflag = PCATCH | PBDRY; 698 else 699 ct->ct_waitflag = 0; 700 break; 701 702 case CLGET_INTERRUPTIBLE: 703 if (ct->ct_waitflag) 704 *(int *) info = TRUE; 705 else 706 *(int *) info = FALSE; 707 break; 708 709 case CLSET_BACKCHANNEL: 710 xprt = (SVCXPRT *)info; 711 if (ct->ct_backchannelxprt == NULL) { 712 xprt->xp_p2 = ct; 713 ct->ct_backchannelxprt = xprt; 714 } 715 break; 716 717 default: 718 mtx_unlock(&ct->ct_lock); 719 return (FALSE); 720 } 721 722 mtx_unlock(&ct->ct_lock); 723 return (TRUE); 724 } 725 726 static void 727 clnt_vc_close(CLIENT *cl) 728 { 729 struct ct_data *ct = (struct ct_data *) cl->cl_private; 730 struct ct_request *cr; 731 732 mtx_lock(&ct->ct_lock); 733 734 if (ct->ct_closed) { 735 mtx_unlock(&ct->ct_lock); 736 return; 737 } 738 739 if (ct->ct_closing) { 740 while (ct->ct_closing) 741 msleep(ct, &ct->ct_lock, 0, "rpcclose", 0); 742 KASSERT(ct->ct_closed, ("client should be closed")); 743 mtx_unlock(&ct->ct_lock); 744 return; 745 } 746 747 if (ct->ct_socket) { 748 ct->ct_closing = TRUE; 749 mtx_unlock(&ct->ct_lock); 750 751 SOCKBUF_LOCK(&ct->ct_socket->so_rcv); 752 soupcall_clear(ct->ct_socket, SO_RCV); 753 clnt_vc_upcallsdone(ct); 754 SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv); 755 756 /* 757 * Abort any pending requests and wait until everyone 758 * has finished with clnt_vc_call. 759 */ 760 mtx_lock(&ct->ct_lock); 761 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) { 762 cr->cr_xid = 0; 763 cr->cr_error = ESHUTDOWN; 764 wakeup(cr); 765 } 766 767 while (ct->ct_threads) 768 msleep(ct, &ct->ct_lock, 0, "rpcclose", 0); 769 } 770 771 ct->ct_closing = FALSE; 772 ct->ct_closed = TRUE; 773 mtx_unlock(&ct->ct_lock); 774 wakeup(ct); 775 } 776 777 static void 778 clnt_vc_destroy(CLIENT *cl) 779 { 780 struct ct_data *ct = (struct ct_data *) cl->cl_private; 781 struct socket *so = NULL; 782 SVCXPRT *xprt; 783 784 clnt_vc_close(cl); 785 786 mtx_lock(&ct->ct_lock); 787 xprt = ct->ct_backchannelxprt; 788 ct->ct_backchannelxprt = NULL; 789 if (xprt != NULL) { 790 mtx_unlock(&ct->ct_lock); /* To avoid a LOR. */ 791 sx_xlock(&xprt->xp_lock); 792 mtx_lock(&ct->ct_lock); 793 xprt->xp_p2 = NULL; 794 xprt_unregister(xprt); 795 } 796 797 if (ct->ct_socket) { 798 if (ct->ct_closeit) { 799 so = ct->ct_socket; 800 } 801 } 802 803 mtx_unlock(&ct->ct_lock); 804 if (xprt != NULL) { 805 sx_xunlock(&xprt->xp_lock); 806 SVC_RELEASE(xprt); 807 } 808 809 mtx_destroy(&ct->ct_lock); 810 if (so) { 811 soshutdown(so, SHUT_WR); 812 soclose(so); 813 } 814 mem_free(ct, sizeof(struct ct_data)); 815 if (cl->cl_netid && cl->cl_netid[0]) 816 mem_free(cl->cl_netid, strlen(cl->cl_netid) +1); 817 if (cl->cl_tp && cl->cl_tp[0]) 818 mem_free(cl->cl_tp, strlen(cl->cl_tp) +1); 819 mem_free(cl, sizeof(CLIENT)); 820 } 821 822 /* 823 * Make sure that the time is not garbage. -1 value is disallowed. 824 * Note this is different from time_not_ok in clnt_dg.c 825 */ 826 static bool_t 827 time_not_ok(struct timeval *t) 828 { 829 return (t->tv_sec <= -1 || t->tv_sec > 100000000 || 830 t->tv_usec <= -1 || t->tv_usec > 1000000); 831 } 832 833 int 834 clnt_vc_soupcall(struct socket *so, void *arg, int waitflag) 835 { 836 struct ct_data *ct = (struct ct_data *) arg; 837 struct uio uio; 838 struct mbuf *m, *m2; 839 struct ct_request *cr; 840 int error, rcvflag, foundreq; 841 uint32_t xid_plus_direction[2], header; 842 bool_t do_read; 843 SVCXPRT *xprt; 844 struct cf_conn *cd; 845 846 CTASSERT(sizeof(xid_plus_direction) == 2 * sizeof(uint32_t)); 847 ct->ct_upcallrefs++; 848 uio.uio_td = curthread; 849 do { 850 /* 851 * If ct_record_resid is zero, we are waiting for a 852 * record mark. 853 */ 854 if (ct->ct_record_resid == 0) { 855 856 /* 857 * Make sure there is either a whole record 858 * mark in the buffer or there is some other 859 * error condition 860 */ 861 do_read = FALSE; 862 if (so->so_rcv.sb_cc >= sizeof(uint32_t) 863 || (so->so_rcv.sb_state & SBS_CANTRCVMORE) 864 || so->so_error) 865 do_read = TRUE; 866 867 if (!do_read) 868 break; 869 870 SOCKBUF_UNLOCK(&so->so_rcv); 871 uio.uio_resid = sizeof(uint32_t); 872 m = NULL; 873 rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK; 874 error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag); 875 SOCKBUF_LOCK(&so->so_rcv); 876 877 if (error == EWOULDBLOCK) 878 break; 879 880 /* 881 * If there was an error, wake up all pending 882 * requests. 883 */ 884 if (error || uio.uio_resid > 0) { 885 wakeup_all: 886 mtx_lock(&ct->ct_lock); 887 if (!error) { 888 /* 889 * We must have got EOF trying 890 * to read from the stream. 891 */ 892 error = ECONNRESET; 893 } 894 ct->ct_error.re_status = RPC_CANTRECV; 895 ct->ct_error.re_errno = error; 896 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) { 897 cr->cr_error = error; 898 wakeup(cr); 899 } 900 mtx_unlock(&ct->ct_lock); 901 break; 902 } 903 m_copydata(m, 0, sizeof(uint32_t), (char *)&header); 904 header = ntohl(header); 905 ct->ct_record = NULL; 906 ct->ct_record_resid = header & 0x7fffffff; 907 ct->ct_record_eor = ((header & 0x80000000) != 0); 908 m_freem(m); 909 } else { 910 /* 911 * Wait until the socket has the whole record 912 * buffered. 913 */ 914 do_read = FALSE; 915 if (so->so_rcv.sb_cc >= ct->ct_record_resid 916 || (so->so_rcv.sb_state & SBS_CANTRCVMORE) 917 || so->so_error) 918 do_read = TRUE; 919 920 if (!do_read) 921 break; 922 923 /* 924 * We have the record mark. Read as much as 925 * the socket has buffered up to the end of 926 * this record. 927 */ 928 SOCKBUF_UNLOCK(&so->so_rcv); 929 uio.uio_resid = ct->ct_record_resid; 930 m = NULL; 931 rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK; 932 error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag); 933 SOCKBUF_LOCK(&so->so_rcv); 934 935 if (error == EWOULDBLOCK) 936 break; 937 938 if (error || uio.uio_resid == ct->ct_record_resid) 939 goto wakeup_all; 940 941 /* 942 * If we have part of the record already, 943 * chain this bit onto the end. 944 */ 945 if (ct->ct_record) 946 m_last(ct->ct_record)->m_next = m; 947 else 948 ct->ct_record = m; 949 950 ct->ct_record_resid = uio.uio_resid; 951 952 /* 953 * If we have the entire record, see if we can 954 * match it to a request. 955 */ 956 if (ct->ct_record_resid == 0 957 && ct->ct_record_eor) { 958 /* 959 * The XID is in the first uint32_t of 960 * the reply and the message direction 961 * is the second one. 962 */ 963 if (ct->ct_record->m_len < 964 sizeof(xid_plus_direction) && 965 m_length(ct->ct_record, NULL) < 966 sizeof(xid_plus_direction)) { 967 m_freem(ct->ct_record); 968 break; 969 } 970 m_copydata(ct->ct_record, 0, 971 sizeof(xid_plus_direction), 972 (char *)xid_plus_direction); 973 xid_plus_direction[0] = 974 ntohl(xid_plus_direction[0]); 975 xid_plus_direction[1] = 976 ntohl(xid_plus_direction[1]); 977 /* Check message direction. */ 978 if (xid_plus_direction[1] == CALL) { 979 /* This is a backchannel request. */ 980 mtx_lock(&ct->ct_lock); 981 xprt = ct->ct_backchannelxprt; 982 if (xprt == NULL) { 983 mtx_unlock(&ct->ct_lock); 984 /* Just throw it away. */ 985 m_freem(ct->ct_record); 986 ct->ct_record = NULL; 987 } else { 988 cd = (struct cf_conn *) 989 xprt->xp_p1; 990 m2 = cd->mreq; 991 /* 992 * The requests are chained 993 * in the m_nextpkt list. 994 */ 995 while (m2 != NULL && 996 m2->m_nextpkt != NULL) 997 /* Find end of list. */ 998 m2 = m2->m_nextpkt; 999 if (m2 != NULL) 1000 m2->m_nextpkt = 1001 ct->ct_record; 1002 else 1003 cd->mreq = 1004 ct->ct_record; 1005 ct->ct_record->m_nextpkt = 1006 NULL; 1007 ct->ct_record = NULL; 1008 xprt_active(xprt); 1009 mtx_unlock(&ct->ct_lock); 1010 } 1011 } else { 1012 mtx_lock(&ct->ct_lock); 1013 foundreq = 0; 1014 TAILQ_FOREACH(cr, &ct->ct_pending, 1015 cr_link) { 1016 if (cr->cr_xid == 1017 xid_plus_direction[0]) { 1018 /* 1019 * This one 1020 * matches. We leave 1021 * the reply mbuf in 1022 * cr->cr_mrep. Set 1023 * the XID to zero so 1024 * that we will ignore 1025 * any duplicated 1026 * replies. 1027 */ 1028 cr->cr_xid = 0; 1029 cr->cr_mrep = 1030 ct->ct_record; 1031 cr->cr_error = 0; 1032 foundreq = 1; 1033 wakeup(cr); 1034 break; 1035 } 1036 } 1037 mtx_unlock(&ct->ct_lock); 1038 1039 if (!foundreq) 1040 m_freem(ct->ct_record); 1041 ct->ct_record = NULL; 1042 } 1043 } 1044 } 1045 } while (m); 1046 ct->ct_upcallrefs--; 1047 if (ct->ct_upcallrefs < 0) 1048 panic("rpcvc upcall refcnt"); 1049 if (ct->ct_upcallrefs == 0) 1050 wakeup(&ct->ct_upcallrefs); 1051 return (SU_OK); 1052 } 1053 1054 /* 1055 * Wait for all upcalls in progress to complete. 1056 */ 1057 static void 1058 clnt_vc_upcallsdone(struct ct_data *ct) 1059 { 1060 1061 SOCKBUF_LOCK_ASSERT(&ct->ct_socket->so_rcv); 1062 1063 while (ct->ct_upcallrefs > 0) 1064 (void) msleep(&ct->ct_upcallrefs, 1065 SOCKBUF_MTX(&ct->ct_socket->so_rcv), 0, "rpcvcup", 0); 1066 }
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