sys/rpc/clnt_vc.c

   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;
 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         if (cl) {
 274                 if (ct) {
 275                         mtx_destroy(&ct->ct_lock);
 276                         mem_free(ct, sizeof (struct ct_data));
 277                 }
 278                 if (cl)
 279                         mem_free(cl, sizeof (CLIENT));
 280         }
 281         return ((CLIENT *)NULL);
 282 }
 283
 284 static enum clnt_stat
 285 clnt_vc_call(
 286         CLIENT          *cl,            /* client handle */
 287         struct rpc_callextra *ext,      /* call metadata */
 288         rpcproc_t       proc,           /* procedure number */
 289         struct mbuf     *args,          /* pointer to args */
 290         struct mbuf     **resultsp,     /* pointer to results */
 291         struct timeval  utimeout)
 292 {
 293         struct ct_data *ct = (struct ct_data *) cl->cl_private;
 294         AUTH *auth;
 295         struct rpc_err *errp;
 296         enum clnt_stat stat;
 297         XDR xdrs;
 298         struct rpc_msg reply_msg;
 299         bool_t ok;
 300         int nrefreshes = 2;             /* number of times to refresh cred */
 301         struct timeval timeout;
 302         uint32_t xid;
 303         struct mbuf *mreq = NULL, *results;
 304         struct ct_request *cr;
 305         int error;
 306
 307         cr = malloc(sizeof(struct ct_request), M_RPC, M_WAITOK);
 308
 309         mtx_lock(&ct->ct_lock);
 310
 311         if (ct->ct_closing || ct->ct_closed) {
 312                 mtx_unlock(&ct->ct_lock);
 313                 free(cr, M_RPC);
 314                 return (RPC_CANTSEND);
 315         }
 316         ct->ct_threads++;
 317
 318         if (ext) {
 319                 auth = ext->rc_auth;
 320                 errp = &ext->rc_err;
 321         } else {
 322                 auth = cl->cl_auth;
 323                 errp = &ct->ct_error;
 324         }
 325
 326         cr->cr_mrep = NULL;
 327         cr->cr_error = 0;
 328
 329         if (ct->ct_wait.tv_usec == -1) {
 330                 timeout = utimeout;     /* use supplied timeout */
 331         } else {
 332                 timeout = ct->ct_wait;  /* use default timeout */
 333         }
 334
 335 call_again:
 336         mtx_assert(&ct->ct_lock, MA_OWNED);
 337
 338         ct->ct_xid++;
 339         xid = ct->ct_xid;
 340
 341         mtx_unlock(&ct->ct_lock);
 342
 343         /*
 344          * Leave space to pre-pend the record mark.
 345          */
 346         mreq = m_gethdr(M_WAITOK, MT_DATA);
 347         mreq->m_data += sizeof(uint32_t);
 348         KASSERT(ct->ct_mpos + sizeof(uint32_t) <= MHLEN,
 349             ("RPC header too big"));
 350         bcopy(ct->ct_mcallc, mreq->m_data, ct->ct_mpos);
 351         mreq->m_len = ct->ct_mpos;
 352
 353         /*
 354          * The XID is the first thing in the request.
 355          */
 356         *mtod(mreq, uint32_t *) = htonl(xid);
 357
 358         xdrmbuf_create(&xdrs, mreq, XDR_ENCODE);
 359
 360         errp->re_status = stat = RPC_SUCCESS;
 361
 362         if ((! XDR_PUTINT32(&xdrs, &proc)) ||
 363             (! AUTH_MARSHALL(auth, xid, &xdrs,
 364                 m_copym(args, 0, M_COPYALL, M_WAITOK)))) {
 365                 errp->re_status = stat = RPC_CANTENCODEARGS;
 366                 mtx_lock(&ct->ct_lock);
 367                 goto out;
 368         }
 369         mreq->m_pkthdr.len = m_length(mreq, NULL);
 370
 371         /*
 372          * Prepend a record marker containing the packet length.
 373          */
 374         M_PREPEND(mreq, sizeof(uint32_t), M_WAITOK);
 375         *mtod(mreq, uint32_t *) =
 376                 htonl(0x80000000 | (mreq->m_pkthdr.len - sizeof(uint32_t)));
 377
 378         cr->cr_xid = xid;
 379         mtx_lock(&ct->ct_lock);
 380         /*
 381          * Check to see if the other end has already started to close down
 382          * the connection. The upcall will have set ct_error.re_status
 383          * to RPC_CANTRECV if this is the case.
 384          * If the other end starts to close down the connection after this
 385          * point, it will be detected later when cr_error is checked,
 386          * since the request is in the ct_pending queue.
 387          */
 388         if (ct->ct_error.re_status == RPC_CANTRECV) {
 389                 if (errp != &ct->ct_error) {
 390                         errp->re_errno = ct->ct_error.re_errno;
 391                         errp->re_status = RPC_CANTRECV;
 392                 }
 393                 stat = RPC_CANTRECV;
 394                 goto out;
 395         }
 396         TAILQ_INSERT_TAIL(&ct->ct_pending, cr, cr_link);
 397         mtx_unlock(&ct->ct_lock);
 398
 399         /*
 400          * sosend consumes mreq.
 401          */
 402         error = sosend(ct->ct_socket, NULL, NULL, mreq, NULL, 0, curthread);
 403         mreq = NULL;
 404         if (error == EMSGSIZE) {
 405                 SOCKBUF_LOCK(&ct->ct_socket->so_snd);
 406                 sbwait(&ct->ct_socket->so_snd);
 407                 SOCKBUF_UNLOCK(&ct->ct_socket->so_snd);
 408                 AUTH_VALIDATE(auth, xid, NULL, NULL);
 409                 mtx_lock(&ct->ct_lock);
 410                 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
 411                 goto call_again;
 412         }
 413
 414         reply_msg.acpted_rply.ar_verf.oa_flavor = AUTH_NULL;
 415         reply_msg.acpted_rply.ar_verf.oa_base = cr->cr_verf;
 416         reply_msg.acpted_rply.ar_verf.oa_length = 0;
 417         reply_msg.acpted_rply.ar_results.where = NULL;
 418         reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
 419
 420         mtx_lock(&ct->ct_lock);
 421         if (error) {
 422                 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
 423                 errp->re_errno = error;
 424                 errp->re_status = stat = RPC_CANTSEND;
 425                 goto out;
 426         }
 427
 428         /*
 429          * Check to see if we got an upcall while waiting for the
 430          * lock. In both these cases, the request has been removed
 431          * from ct->ct_pending.
 432          */
 433         if (cr->cr_error) {
 434                 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
 435                 errp->re_errno = cr->cr_error;
 436                 errp->re_status = stat = RPC_CANTRECV;
 437                 goto out;
 438         }
 439         if (cr->cr_mrep) {
 440                 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
 441                 goto got_reply;
 442         }
 443
 444         /*
 445          * Hack to provide rpc-based message passing
 446          */
 447         if (timeout.tv_sec == 0 && timeout.tv_usec == 0) {
 448                 TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
 449                 errp->re_status = stat = RPC_TIMEDOUT;
 450                 goto out;
 451         }
 452
 453         error = msleep(cr, &ct->ct_lock, ct->ct_waitflag, ct->ct_waitchan,
 454             tvtohz(&timeout));
 455
 456         TAILQ_REMOVE(&ct->ct_pending, cr, cr_link);
 457
 458         if (error) {
 459                 /*
 460                  * The sleep returned an error so our request is still
 461                  * on the list. Turn the error code into an
 462                  * appropriate client status.
 463                  */
 464                 errp->re_errno = error;
 465                 switch (error) {
 466                 case EINTR:
 467                         stat = RPC_INTR;
 468                         break;
 469                 case EWOULDBLOCK:
 470                         stat = RPC_TIMEDOUT;
 471                         break;
 472                 default:
 473                         stat = RPC_CANTRECV;
 474                 }
 475                 errp->re_status = stat;
 476                 goto out;
 477         } else {
 478                 /*
 479                  * We were woken up by the upcall.  If the
 480                  * upcall had a receive error, report that,
 481                  * otherwise we have a reply.
 482                  */
 483                 if (cr->cr_error) {
 484                         errp->re_errno = cr->cr_error;
 485                         errp->re_status = stat = RPC_CANTRECV;
 486                         goto out;
 487                 }
 488         }
 489
 490 got_reply:
 491         /*
 492          * Now decode and validate the response. We need to drop the
 493          * lock since xdr_replymsg may end up sleeping in malloc.
 494          */
 495         mtx_unlock(&ct->ct_lock);
 496
 497         if (ext && ext->rc_feedback)
 498                 ext->rc_feedback(FEEDBACK_OK, proc, ext->rc_feedback_arg);
 499
 500         xdrmbuf_create(&xdrs, cr->cr_mrep, XDR_DECODE);
 501         ok = xdr_replymsg(&xdrs, &reply_msg);
 502         cr->cr_mrep = NULL;
 503
 504         if (ok) {
 505                 if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
 506                     (reply_msg.acpted_rply.ar_stat == SUCCESS))
 507                         errp->re_status = stat = RPC_SUCCESS;
 508                 else
 509                         stat = _seterr_reply(&reply_msg, errp);
 510
 511                 if (stat == RPC_SUCCESS) {
 512                         results = xdrmbuf_getall(&xdrs);
 513                         if (!AUTH_VALIDATE(auth, xid,
 514                                 &reply_msg.acpted_rply.ar_verf,
 515                                 &results)) {
 516                                 errp->re_status = stat = RPC_AUTHERROR;
 517                                 errp->re_why = AUTH_INVALIDRESP;
 518                         } else {
 519                                 KASSERT(results,
 520                                     ("auth validated but no result"));
 521                                 *resultsp = results;
 522                         }
 523                 }               /* end successful completion */
 524                 /*
 525                  * If unsuccesful AND error is an authentication error
 526                  * then refresh credentials and try again, else break
 527                  */
 528                 else if (stat == RPC_AUTHERROR)
 529                         /* maybe our credentials need to be refreshed ... */
 530                         if (nrefreshes > 0 &&
 531                             AUTH_REFRESH(auth, &reply_msg)) {
 532                                 nrefreshes--;
 533                                 XDR_DESTROY(&xdrs);
 534                                 mtx_lock(&ct->ct_lock);
 535                                 goto call_again;
 536                         }
 537                 /* end of unsuccessful completion */
 538         }       /* end of valid reply message */
 539         else {
 540                 errp->re_status = stat = RPC_CANTDECODERES;
 541         }
 542         XDR_DESTROY(&xdrs);
 543         mtx_lock(&ct->ct_lock);
 544 out:
 545         mtx_assert(&ct->ct_lock, MA_OWNED);
 546
 547         KASSERT(stat != RPC_SUCCESS || *resultsp,
 548             ("RPC_SUCCESS without reply"));
 549
 550         if (mreq)
 551                 m_freem(mreq);
 552         if (cr->cr_mrep)
 553                 m_freem(cr->cr_mrep);
 554
 555         ct->ct_threads--;
 556         if (ct->ct_closing)
 557                 wakeup(ct);
 558
 559         mtx_unlock(&ct->ct_lock);
 560
 561         if (auth && stat != RPC_SUCCESS)
 562                 AUTH_VALIDATE(auth, xid, NULL, NULL);
 563
 564         free(cr, M_RPC);
 565
 566         return (stat);
 567 }
 568
 569 static void
 570 clnt_vc_geterr(CLIENT *cl, struct rpc_err *errp)
 571 {
 572         struct ct_data *ct = (struct ct_data *) cl->cl_private;
 573
 574         *errp = ct->ct_error;
 575 }
 576
 577 static bool_t
 578 clnt_vc_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr)
 579 {
 580         XDR xdrs;
 581         bool_t dummy;
 582
 583         xdrs.x_op = XDR_FREE;
 584         dummy = (*xdr_res)(&xdrs, res_ptr);
 585
 586         return (dummy);
 587 }
 588
 589 /*ARGSUSED*/
 590 static void
 591 clnt_vc_abort(CLIENT *cl)
 592 {
 593 }
 594
 595 static bool_t
 596 clnt_vc_control(CLIENT *cl, u_int request, void *info)
 597 {
 598         struct ct_data *ct = (struct ct_data *)cl->cl_private;
 599         void *infop = info;
 600         SVCXPRT *xprt;
 601
 602         mtx_lock(&ct->ct_lock);
 603
 604         switch (request) {
 605         case CLSET_FD_CLOSE:
 606                 ct->ct_closeit = TRUE;
 607                 mtx_unlock(&ct->ct_lock);
 608                 return (TRUE);
 609         case CLSET_FD_NCLOSE:
 610                 ct->ct_closeit = FALSE;
 611                 mtx_unlock(&ct->ct_lock);
 612                 return (TRUE);
 613         default:
 614                 break;
 615         }
 616
 617         /* for other requests which use info */
 618         if (info == NULL) {
 619                 mtx_unlock(&ct->ct_lock);
 620                 return (FALSE);
 621         }
 622         switch (request) {
 623         case CLSET_TIMEOUT:
 624                 if (time_not_ok((struct timeval *)info)) {
 625                         mtx_unlock(&ct->ct_lock);
 626                         return (FALSE);
 627                 }
 628                 ct->ct_wait = *(struct timeval *)infop;
 629                 break;
 630         case CLGET_TIMEOUT:
 631                 *(struct timeval *)infop = ct->ct_wait;
 632                 break;
 633         case CLGET_SERVER_ADDR:
 634                 (void) memcpy(info, &ct->ct_addr, (size_t)ct->ct_addr.ss_len);
 635                 break;
 636         case CLGET_SVC_ADDR:
 637                 /*
 638                  * Slightly different semantics to userland - we use
 639                  * sockaddr instead of netbuf.
 640                  */
 641                 memcpy(info, &ct->ct_addr, ct->ct_addr.ss_len);
 642                 break;
 643         case CLSET_SVC_ADDR:            /* set to new address */
 644                 mtx_unlock(&ct->ct_lock);
 645                 return (FALSE);
 646         case CLGET_XID:
 647                 *(uint32_t *)info = ct->ct_xid;
 648                 break;
 649         case CLSET_XID:
 650                 /* This will set the xid of the NEXT call */
 651                 /* decrement by 1 as clnt_vc_call() increments once */
 652                 ct->ct_xid = *(uint32_t *)info - 1;
 653                 break;
 654         case CLGET_VERS:
 655                 /*
 656                  * This RELIES on the information that, in the call body,
 657                  * the version number field is the fifth field from the
 658                  * begining of the RPC header. MUST be changed if the
 659                  * call_struct is changed
 660                  */
 661                 *(uint32_t *)info =
 662                     ntohl(*(uint32_t *)(void *)(ct->ct_mcallc +
 663                     4 * BYTES_PER_XDR_UNIT));
 664                 break;
 665
 666         case CLSET_VERS:
 667                 *(uint32_t *)(void *)(ct->ct_mcallc +
 668                     4 * BYTES_PER_XDR_UNIT) =
 669                     htonl(*(uint32_t *)info);
 670                 break;
 671
 672         case CLGET_PROG:
 673                 /*
 674                  * This RELIES on the information that, in the call body,
 675                  * the program number field is the fourth field from the
 676                  * begining of the RPC header. MUST be changed if the
 677                  * call_struct is changed
 678                  */
 679                 *(uint32_t *)info =
 680                     ntohl(*(uint32_t *)(void *)(ct->ct_mcallc +
 681                     3 * BYTES_PER_XDR_UNIT));
 682                 break;
 683
 684         case CLSET_PROG:
 685                 *(uint32_t *)(void *)(ct->ct_mcallc +
 686                     3 * BYTES_PER_XDR_UNIT) =
 687                     htonl(*(uint32_t *)info);
 688                 break;
 689
 690         case CLSET_WAITCHAN:
 691                 ct->ct_waitchan = (const char *)info;
 692                 break;
 693
 694         case CLGET_WAITCHAN:
 695                 *(const char **) info = ct->ct_waitchan;
 696                 break;
 697
 698         case CLSET_INTERRUPTIBLE:
 699                 if (*(int *) info)
 700                         ct->ct_waitflag = PCATCH;
 701                 else
 702                         ct->ct_waitflag = 0;
 703                 break;
 704
 705         case CLGET_INTERRUPTIBLE:
 706                 if (ct->ct_waitflag)
 707                         *(int *) info = TRUE;
 708                 else
 709                         *(int *) info = FALSE;
 710                 break;
 711
 712         case CLSET_BACKCHANNEL:
 713                 xprt = (SVCXPRT *)info;
 714                 if (ct->ct_backchannelxprt == NULL) {
 715                         xprt->xp_p2 = ct;
 716                         ct->ct_backchannelxprt = xprt;
 717                 }
 718                 break;
 719
 720         default:
 721                 mtx_unlock(&ct->ct_lock);
 722                 return (FALSE);
 723         }
 724
 725         mtx_unlock(&ct->ct_lock);
 726         return (TRUE);
 727 }
 728
 729 static void
 730 clnt_vc_close(CLIENT *cl)
 731 {
 732         struct ct_data *ct = (struct ct_data *) cl->cl_private;
 733         struct ct_request *cr;
 734
 735         mtx_lock(&ct->ct_lock);
 736
 737         if (ct->ct_closed) {
 738                 mtx_unlock(&ct->ct_lock);
 739                 return;
 740         }
 741
 742         if (ct->ct_closing) {
 743                 while (ct->ct_closing)
 744                         msleep(ct, &ct->ct_lock, 0, "rpcclose", 0);
 745                 KASSERT(ct->ct_closed, ("client should be closed"));
 746                 mtx_unlock(&ct->ct_lock);
 747                 return;
 748         }
 749
 750         if (ct->ct_socket) {
 751                 ct->ct_closing = TRUE;
 752                 mtx_unlock(&ct->ct_lock);
 753
 754                 SOCKBUF_LOCK(&ct->ct_socket->so_rcv);
 755                 soupcall_clear(ct->ct_socket, SO_RCV);
 756                 clnt_vc_upcallsdone(ct);
 757                 SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv);
 758
 759                 /*
 760                  * Abort any pending requests and wait until everyone
 761                  * has finished with clnt_vc_call.
 762                  */
 763                 mtx_lock(&ct->ct_lock);
 764                 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) {
 765                         cr->cr_xid = 0;
 766                         cr->cr_error = ESHUTDOWN;
 767                         wakeup(cr);
 768                 }
 769
 770                 while (ct->ct_threads)
 771                         msleep(ct, &ct->ct_lock, 0, "rpcclose", 0);
 772         }
 773
 774         ct->ct_closing = FALSE;
 775         ct->ct_closed = TRUE;
 776         mtx_unlock(&ct->ct_lock);
 777         wakeup(ct);
 778 }
 779
 780 static void
 781 clnt_vc_destroy(CLIENT *cl)
 782 {
 783         struct ct_data *ct = (struct ct_data *) cl->cl_private;
 784         struct socket *so = NULL;
 785         SVCXPRT *xprt;
 786
 787         clnt_vc_close(cl);
 788
 789         mtx_lock(&ct->ct_lock);
 790         xprt = ct->ct_backchannelxprt;
 791         ct->ct_backchannelxprt = NULL;
 792         if (xprt != NULL) {
 793                 mtx_unlock(&ct->ct_lock);       /* To avoid a LOR. */
 794                 sx_xlock(&xprt->xp_lock);
 795                 mtx_lock(&ct->ct_lock);
 796                 xprt->xp_p2 = NULL;
 797                 xprt_unregister(xprt);
 798         }
 799
 800         if (ct->ct_socket) {
 801                 if (ct->ct_closeit) {
 802                         so = ct->ct_socket;
 803                 }
 804         }
 805
 806         mtx_unlock(&ct->ct_lock);
 807         if (xprt != NULL) {
 808                 sx_xunlock(&xprt->xp_lock);
 809                 SVC_RELEASE(xprt);
 810         }
 811
 812         mtx_destroy(&ct->ct_lock);
 813         if (so) {
 814                 soshutdown(so, SHUT_WR);
 815                 soclose(so);
 816         }
 817         mem_free(ct, sizeof(struct ct_data));
 818         if (cl->cl_netid && cl->cl_netid[0])
 819                 mem_free(cl->cl_netid, strlen(cl->cl_netid) +1);
 820         if (cl->cl_tp && cl->cl_tp[0])
 821                 mem_free(cl->cl_tp, strlen(cl->cl_tp) +1);
 822         mem_free(cl, sizeof(CLIENT));
 823 }
 824
 825 /*
 826  * Make sure that the time is not garbage.   -1 value is disallowed.
 827  * Note this is different from time_not_ok in clnt_dg.c
 828  */
 829 static bool_t
 830 time_not_ok(struct timeval *t)
 831 {
 832         return (t->tv_sec <= -1 || t->tv_sec > 100000000 ||
 833                 t->tv_usec <= -1 || t->tv_usec > 1000000);
 834 }
 835
 836 int
 837 clnt_vc_soupcall(struct socket *so, void *arg, int waitflag)
 838 {
 839         struct ct_data *ct = (struct ct_data *) arg;
 840         struct uio uio;
 841         struct mbuf *m, *m2;
 842         struct ct_request *cr;
 843         int error, rcvflag, foundreq;
 844         uint32_t xid_plus_direction[2], header;
 845         bool_t do_read;
 846         SVCXPRT *xprt;
 847         struct cf_conn *cd;
 848
 849         CTASSERT(sizeof(xid_plus_direction) == 2 * sizeof(uint32_t));
 850         ct->ct_upcallrefs++;
 851         uio.uio_td = curthread;
 852         do {
 853                 /*
 854                  * If ct_record_resid is zero, we are waiting for a
 855                  * record mark.
 856                  */
 857                 if (ct->ct_record_resid == 0) {
 858
 859                         /*
 860                          * Make sure there is either a whole record
 861                          * mark in the buffer or there is some other
 862                          * error condition
 863                          */
 864                         do_read = FALSE;
 865                         if (so->so_rcv.sb_cc >= sizeof(uint32_t)
 866                             || (so->so_rcv.sb_state & SBS_CANTRCVMORE)
 867                             || so->so_error)
 868                                 do_read = TRUE;
 869
 870                         if (!do_read)
 871                                 break;
 872
 873                         SOCKBUF_UNLOCK(&so->so_rcv);
 874                         uio.uio_resid = sizeof(uint32_t);
 875                         m = NULL;
 876                         rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK;
 877                         error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag);
 878                         SOCKBUF_LOCK(&so->so_rcv);
 879
 880                         if (error == EWOULDBLOCK)
 881                                 break;
 882
 883                         /*
 884                          * If there was an error, wake up all pending
 885                          * requests.
 886                          */
 887                         if (error || uio.uio_resid > 0) {
 888                         wakeup_all:
 889                                 mtx_lock(&ct->ct_lock);
 890                                 if (!error) {
 891                                         /*
 892                                          * We must have got EOF trying
 893                                          * to read from the stream.
 894                                          */
 895                                         error = ECONNRESET;
 896                                 }
 897                                 ct->ct_error.re_status = RPC_CANTRECV;
 898                                 ct->ct_error.re_errno = error;
 899                                 TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) {
 900                                         cr->cr_error = error;
 901                                         wakeup(cr);
 902                                 }
 903                                 mtx_unlock(&ct->ct_lock);
 904                                 break;
 905                         }
 906                         m_copydata(m, 0, sizeof(uint32_t), (char *)&header);
 907                         header = ntohl(header);
 908                         ct->ct_record = NULL;
 909                         ct->ct_record_resid = header & 0x7fffffff;
 910                         ct->ct_record_eor = ((header & 0x80000000) != 0);
 911                         m_freem(m);
 912                 } else {
 913                         /*
 914                          * Wait until the socket has the whole record
 915                          * buffered.
 916                          */
 917                         do_read = FALSE;
 918                         if (so->so_rcv.sb_cc >= ct->ct_record_resid
 919                             || (so->so_rcv.sb_state & SBS_CANTRCVMORE)
 920                             || so->so_error)
 921                                 do_read = TRUE;
 922
 923                         if (!do_read)
 924                                 break;
 925
 926                         /*
 927                          * We have the record mark. Read as much as
 928                          * the socket has buffered up to the end of
 929                          * this record.
 930                          */
 931                         SOCKBUF_UNLOCK(&so->so_rcv);
 932                         uio.uio_resid = ct->ct_record_resid;
 933                         m = NULL;
 934                         rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK;
 935                         error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag);
 936                         SOCKBUF_LOCK(&so->so_rcv);
 937
 938                         if (error == EWOULDBLOCK)
 939                                 break;
 940
 941                         if (error || uio.uio_resid == ct->ct_record_resid)
 942                                 goto wakeup_all;
 943
 944                         /*
 945                          * If we have part of the record already,
 946                          * chain this bit onto the end.
 947                          */
 948                         if (ct->ct_record)
 949                                 m_last(ct->ct_record)->m_next = m;
 950                         else
 951                                 ct->ct_record = m;
 952
 953                         ct->ct_record_resid = uio.uio_resid;
 954
 955                         /*
 956                          * If we have the entire record, see if we can
 957                          * match it to a request.
 958                          */
 959                         if (ct->ct_record_resid == 0
 960                             && ct->ct_record_eor) {
 961                                 /*
 962                                  * The XID is in the first uint32_t of
 963                                  * the reply and the message direction
 964                                  * is the second one.
 965                                  */
 966                                 if (ct->ct_record->m_len <
 967                                     sizeof(xid_plus_direction) &&
 968                                     m_length(ct->ct_record, NULL) <
 969                                     sizeof(xid_plus_direction)) {
 970                                         m_freem(ct->ct_record);
 971                                         break;
 972                                 }
 973                                 m_copydata(ct->ct_record, 0,
 974                                     sizeof(xid_plus_direction),
 975                                     (char *)xid_plus_direction);
 976                                 xid_plus_direction[0] =
 977                                     ntohl(xid_plus_direction[0]);
 978                                 xid_plus_direction[1] =
 979                                     ntohl(xid_plus_direction[1]);
 980                                 /* Check message direction. */
 981                                 if (xid_plus_direction[1] == CALL) {
 982                                         /* This is a backchannel request. */
 983                                         mtx_lock(&ct->ct_lock);
 984                                         xprt = ct->ct_backchannelxprt;
 985                                         if (xprt == NULL) {
 986                                                 mtx_unlock(&ct->ct_lock);
 987                                                 /* Just throw it away. */
 988                                                 m_freem(ct->ct_record);
 989                                                 ct->ct_record = NULL;
 990                                         } else {
 991                                                 cd = (struct cf_conn *)
 992                                                     xprt->xp_p1;
 993                                                 m2 = cd->mreq;
 994                                                 /*
 995                                                  * The requests are chained
 996                                                  * in the m_nextpkt list.
 997                                                  */
 998                                                 while (m2 != NULL &&
 999                                                     m2->m_nextpkt != NULL)
1000                                                         /* Find end of list. */
1001                                                         m2 = m2->m_nextpkt;
1002                                                 if (m2 != NULL)
1003                                                         m2->m_nextpkt =
1004                                                             ct->ct_record;
1005                                                 else
1006                                                         cd->mreq =
1007                                                             ct->ct_record;
1008                                                 ct->ct_record->m_nextpkt =
1009                                                     NULL;
1010                                                 ct->ct_record = NULL;
1011                                                 xprt_active(xprt);
1012                                                 mtx_unlock(&ct->ct_lock);
1013                                         }
1014                                 } else {
1015                                         mtx_lock(&ct->ct_lock);
1016                                         foundreq = 0;
1017                                         TAILQ_FOREACH(cr, &ct->ct_pending,
1018                                             cr_link) {
1019                                                 if (cr->cr_xid ==
1020                                                     xid_plus_direction[0]) {
1021                                                         /*
1022                                                          * This one
1023                                                          * matches. We leave
1024                                                          * the reply mbuf in
1025                                                          * cr->cr_mrep. Set
1026                                                          * the XID to zero so
1027                                                          * that we will ignore
1028                                                          * any duplicated
1029                                                          * replies.
1030                                                          */
1031                                                         cr->cr_xid = 0;
1032                                                         cr->cr_mrep =
1033                                                             ct->ct_record;
1034                                                         cr->cr_error = 0;
1035                                                         foundreq = 1;
1036                                                         wakeup(cr);
1037                                                         break;
1038                                                 }
1039                                         }
1040                                         mtx_unlock(&ct->ct_lock);
1041
1042                                         if (!foundreq)
1043                                                 m_freem(ct->ct_record);
1044                                         ct->ct_record = NULL;
1045                                 }
1046                         }
1047                 }
1048         } while (m);
1049         ct->ct_upcallrefs--;
1050         if (ct->ct_upcallrefs < 0)
1051                 panic("rpcvc upcall refcnt");
1052         if (ct->ct_upcallrefs == 0)
1053                 wakeup(&ct->ct_upcallrefs);
1054         return (SU_OK);
1055 }
1056
1057 /*
1058  * Wait for all upcalls in progress to complete.
1059  */
1060 static void
1061 clnt_vc_upcallsdone(struct ct_data *ct)
1062 {
1063
1064         SOCKBUF_LOCK_ASSERT(&ct->ct_socket->so_rcv);
1065
1066         while (ct->ct_upcallrefs > 0)
1067                 (void) msleep(&ct->ct_upcallrefs,
1068                     SOCKBUF_MTX(&ct->ct_socket->so_rcv), 0, "rpcvcup", 0);
1069 }