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 | 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 }