The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/rpc/clnt_dg.c

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    1 /*      $NetBSD: clnt_dg.c,v 1.4 2000/07/14 08:40:41 fvdl Exp $ */
    2 
    3 /*-
    4  * Copyright (c) 2009, Sun Microsystems, Inc.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without 
    8  * modification, are permitted provided that the following conditions are met:
    9  * - Redistributions of source code must retain the above copyright notice, 
   10  *   this list of conditions and the following disclaimer.
   11  * - Redistributions in binary form must reproduce the above copyright notice, 
   12  *   this list of conditions and the following disclaimer in the documentation 
   13  *   and/or other materials provided with the distribution.
   14  * - Neither the name of Sun Microsystems, Inc. nor the names of its 
   15  *   contributors may be used to endorse or promote products derived 
   16  *   from this software without specific prior written permission.
   17  * 
   18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
   19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
   21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
   22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
   25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
   26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
   27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
   28  * POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 /*
   31  * Copyright (c) 1986-1991 by Sun Microsystems Inc. 
   32  */
   33 
   34 #if defined(LIBC_SCCS) && !defined(lint)
   35 #ident  "@(#)clnt_dg.c  1.23    94/04/22 SMI"
   36 static char sccsid[] = "@(#)clnt_dg.c 1.19 89/03/16 Copyr 1988 Sun Micro";
   37 #endif
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD: stable/11/sys/rpc/clnt_dg.c 360110 2020-04-20 01:26:18Z rmacklem $");
   40 
   41 /*
   42  * Implements a connectionless client side RPC.
   43  */
   44 
   45 #include <sys/param.h>
   46 #include <sys/systm.h>
   47 #include <sys/kernel.h>
   48 #include <sys/lock.h>
   49 #include <sys/malloc.h>
   50 #include <sys/mbuf.h>
   51 #include <sys/mutex.h>
   52 #include <sys/pcpu.h>
   53 #include <sys/proc.h>
   54 #include <sys/socket.h>
   55 #include <sys/socketvar.h>
   56 #include <sys/time.h>
   57 #include <sys/uio.h>
   58 
   59 #include <net/vnet.h>
   60 
   61 #include <rpc/rpc.h>
   62 #include <rpc/rpc_com.h>
   63 
   64 
   65 #ifdef _FREEFALL_CONFIG
   66 /*
   67  * Disable RPC exponential back-off for FreeBSD.org systems.
   68  */
   69 #define RPC_MAX_BACKOFF         1 /* second */
   70 #else
   71 #define RPC_MAX_BACKOFF         30 /* seconds */
   72 #endif
   73 
   74 static bool_t time_not_ok(struct timeval *);
   75 static enum clnt_stat clnt_dg_call(CLIENT *, struct rpc_callextra *,
   76     rpcproc_t, struct mbuf *, struct mbuf **, struct timeval);
   77 static void clnt_dg_geterr(CLIENT *, struct rpc_err *);
   78 static bool_t clnt_dg_freeres(CLIENT *, xdrproc_t, void *);
   79 static void clnt_dg_abort(CLIENT *);
   80 static bool_t clnt_dg_control(CLIENT *, u_int, void *);
   81 static void clnt_dg_close(CLIENT *);
   82 static void clnt_dg_destroy(CLIENT *);
   83 static int clnt_dg_soupcall(struct socket *so, void *arg, int waitflag);
   84 
   85 static struct clnt_ops clnt_dg_ops = {
   86         .cl_call =      clnt_dg_call,
   87         .cl_abort =     clnt_dg_abort,
   88         .cl_geterr =    clnt_dg_geterr,
   89         .cl_freeres =   clnt_dg_freeres,
   90         .cl_close =     clnt_dg_close,
   91         .cl_destroy =   clnt_dg_destroy,
   92         .cl_control =   clnt_dg_control
   93 };
   94 
   95 static volatile uint32_t rpc_xid = 0;
   96 
   97 /*
   98  * A pending RPC request which awaits a reply. Requests which have
   99  * received their reply will have cr_xid set to zero and cr_mrep to
  100  * the mbuf chain of the reply.
  101  */
  102 struct cu_request {
  103         TAILQ_ENTRY(cu_request) cr_link;
  104         CLIENT                  *cr_client;     /* owner */
  105         uint32_t                cr_xid;         /* XID of request */
  106         struct mbuf             *cr_mrep;       /* reply received by upcall */
  107         int                     cr_error;       /* any error from upcall */
  108         char                    cr_verf[MAX_AUTH_BYTES]; /* reply verf */
  109 };
  110 
  111 TAILQ_HEAD(cu_request_list, cu_request);
  112 
  113 #define MCALL_MSG_SIZE 24
  114 
  115 /*
  116  * This structure is pointed to by the socket buffer's sb_upcallarg
  117  * member. It is separate from the client private data to facilitate
  118  * multiple clients sharing the same socket. The cs_lock mutex is used
  119  * to protect all fields of this structure, the socket's receive
  120  * buffer SOCKBUF_LOCK is used to ensure that exactly one of these
  121  * structures is installed on the socket.
  122  */
  123 struct cu_socket {
  124         struct mtx              cs_lock;
  125         int                     cs_refs;        /* Count of clients */
  126         struct cu_request_list  cs_pending;     /* Requests awaiting replies */
  127         int                     cs_upcallrefs;  /* Refcnt of upcalls in prog.*/
  128 };
  129 
  130 static void clnt_dg_upcallsdone(struct socket *, struct cu_socket *);
  131 
  132 /*
  133  * Private data kept per client handle
  134  */
  135 struct cu_data {
  136         int                     cu_threads;     /* # threads in clnt_vc_call */
  137         bool_t                  cu_closing;     /* TRUE if we are closing */
  138         bool_t                  cu_closed;      /* TRUE if we are closed */
  139         struct socket           *cu_socket;     /* connection socket */
  140         bool_t                  cu_closeit;     /* opened by library */
  141         struct sockaddr_storage cu_raddr;       /* remote address */
  142         int                     cu_rlen;
  143         struct timeval          cu_wait;        /* retransmit interval */
  144         struct timeval          cu_total;       /* total time for the call */
  145         struct rpc_err          cu_error;
  146         uint32_t                cu_xid;
  147         char                    cu_mcallc[MCALL_MSG_SIZE]; /* marshalled callmsg */
  148         size_t                  cu_mcalllen;
  149         size_t                  cu_sendsz;      /* send size */
  150         size_t                  cu_recvsz;      /* recv size */
  151         int                     cu_async;
  152         int                     cu_connect;     /* Use connect(). */
  153         int                     cu_connected;   /* Have done connect(). */
  154         const char              *cu_waitchan;
  155         int                     cu_waitflag;
  156         int                     cu_cwnd;        /* congestion window */
  157         int                     cu_sent;        /* number of in-flight RPCs */
  158         bool_t                  cu_cwnd_wait;
  159 };
  160 
  161 #define CWNDSCALE       256
  162 #define MAXCWND         (32 * CWNDSCALE)
  163 
  164 /*
  165  * Connection less client creation returns with client handle parameters.
  166  * Default options are set, which the user can change using clnt_control().
  167  * fd should be open and bound.
  168  * NB: The rpch->cl_auth is initialized to null authentication.
  169  *      Caller may wish to set this something more useful.
  170  *
  171  * sendsz and recvsz are the maximum allowable packet sizes that can be
  172  * sent and received. Normally they are the same, but they can be
  173  * changed to improve the program efficiency and buffer allocation.
  174  * If they are 0, use the transport default.
  175  *
  176  * If svcaddr is NULL, returns NULL.
  177  */
  178 CLIENT *
  179 clnt_dg_create(
  180         struct socket *so,
  181         struct sockaddr *svcaddr,       /* servers address */
  182         rpcprog_t program,              /* program number */
  183         rpcvers_t version,              /* version number */
  184         size_t sendsz,                  /* buffer recv size */
  185         size_t recvsz)                  /* buffer send size */
  186 {
  187         CLIENT *cl = NULL;              /* client handle */
  188         struct cu_data *cu = NULL;      /* private data */
  189         struct cu_socket *cs = NULL;
  190         struct sockbuf *sb;
  191         struct timeval now;
  192         struct rpc_msg call_msg;
  193         struct __rpc_sockinfo si;
  194         XDR xdrs;
  195         int error;
  196         uint32_t newxid;
  197 
  198         if (svcaddr == NULL) {
  199                 rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
  200                 return (NULL);
  201         }
  202 
  203         if (!__rpc_socket2sockinfo(so, &si)) {
  204                 rpc_createerr.cf_stat = RPC_TLIERROR;
  205                 rpc_createerr.cf_error.re_errno = 0;
  206                 return (NULL);
  207         }
  208 
  209         /*
  210          * Find the receive and the send size
  211          */
  212         sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz);
  213         recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz);
  214         if ((sendsz == 0) || (recvsz == 0)) {
  215                 rpc_createerr.cf_stat = RPC_TLIERROR; /* XXX */
  216                 rpc_createerr.cf_error.re_errno = 0;
  217                 return (NULL);
  218         }
  219 
  220         cl = mem_alloc(sizeof (CLIENT));
  221 
  222         /*
  223          * Should be multiple of 4 for XDR.
  224          */
  225         sendsz = rounddown(sendsz + 3, 4);
  226         recvsz = rounddown(recvsz + 3, 4);
  227         cu = mem_alloc(sizeof (*cu));
  228         cu->cu_threads = 0;
  229         cu->cu_closing = FALSE;
  230         cu->cu_closed = FALSE;
  231         (void) memcpy(&cu->cu_raddr, svcaddr, (size_t)svcaddr->sa_len);
  232         cu->cu_rlen = svcaddr->sa_len;
  233         /* Other values can also be set through clnt_control() */
  234         cu->cu_wait.tv_sec = 3; /* heuristically chosen */
  235         cu->cu_wait.tv_usec = 0;
  236         cu->cu_total.tv_sec = -1;
  237         cu->cu_total.tv_usec = -1;
  238         cu->cu_sendsz = sendsz;
  239         cu->cu_recvsz = recvsz;
  240         cu->cu_async = FALSE;
  241         cu->cu_connect = FALSE;
  242         cu->cu_connected = FALSE;
  243         cu->cu_waitchan = "rpcrecv";
  244         cu->cu_waitflag = 0;
  245         cu->cu_cwnd = MAXCWND / 2;
  246         cu->cu_sent = 0;
  247         cu->cu_cwnd_wait = FALSE;
  248         (void) getmicrotime(&now);
  249         /* Clip at 28bits so that it will not wrap around. */
  250         newxid = __RPC_GETXID(&now) & 0xfffffff;
  251         atomic_cmpset_32(&rpc_xid, 0, newxid);
  252         call_msg.rm_xid = atomic_fetchadd_32(&rpc_xid, 1);
  253         call_msg.rm_call.cb_prog = program;
  254         call_msg.rm_call.cb_vers = version;
  255         xdrmem_create(&xdrs, cu->cu_mcallc, MCALL_MSG_SIZE, XDR_ENCODE);
  256         if (! xdr_callhdr(&xdrs, &call_msg)) {
  257                 rpc_createerr.cf_stat = RPC_CANTENCODEARGS;  /* XXX */
  258                 rpc_createerr.cf_error.re_errno = 0;
  259                 goto err2;
  260         }
  261         cu->cu_mcalllen = XDR_GETPOS(&xdrs);
  262 
  263         /*
  264          * By default, closeit is always FALSE. It is users responsibility
  265          * to do a close on it, else the user may use clnt_control
  266          * to let clnt_destroy do it for him/her.
  267          */
  268         cu->cu_closeit = FALSE;
  269         cu->cu_socket = so;
  270         error = soreserve(so, (u_long)sendsz, (u_long)recvsz);
  271         if (error != 0) {
  272                 rpc_createerr.cf_stat = RPC_FAILED;
  273                 rpc_createerr.cf_error.re_errno = error;
  274                 goto err2;
  275         }
  276 
  277         sb = &so->so_rcv;
  278         SOCKBUF_LOCK(&so->so_rcv);
  279 recheck_socket:
  280         if (sb->sb_upcall) {
  281                 if (sb->sb_upcall != clnt_dg_soupcall) {
  282                         SOCKBUF_UNLOCK(&so->so_rcv);
  283                         printf("clnt_dg_create(): socket already has an incompatible upcall\n");
  284                         goto err2;
  285                 }
  286                 cs = (struct cu_socket *) sb->sb_upcallarg;
  287                 mtx_lock(&cs->cs_lock);
  288                 cs->cs_refs++;
  289                 mtx_unlock(&cs->cs_lock);
  290         } else {
  291                 /*
  292                  * We are the first on this socket - allocate the
  293                  * structure and install it in the socket.
  294                  */
  295                 SOCKBUF_UNLOCK(&so->so_rcv);
  296                 cs = mem_alloc(sizeof(*cs));
  297                 SOCKBUF_LOCK(&so->so_rcv);
  298                 if (sb->sb_upcall) {
  299                         /*
  300                          * We have lost a race with some other client.
  301                          */
  302                         mem_free(cs, sizeof(*cs));
  303                         goto recheck_socket;
  304                 }
  305                 mtx_init(&cs->cs_lock, "cs->cs_lock", NULL, MTX_DEF);
  306                 cs->cs_refs = 1;
  307                 cs->cs_upcallrefs = 0;
  308                 TAILQ_INIT(&cs->cs_pending);
  309                 soupcall_set(so, SO_RCV, clnt_dg_soupcall, cs);
  310         }
  311         SOCKBUF_UNLOCK(&so->so_rcv);
  312 
  313         cl->cl_refs = 1;
  314         cl->cl_ops = &clnt_dg_ops;
  315         cl->cl_private = (caddr_t)(void *)cu;
  316         cl->cl_auth = authnone_create();
  317         cl->cl_tp = NULL;
  318         cl->cl_netid = NULL;
  319         return (cl);
  320 err2:
  321         mem_free(cl, sizeof (CLIENT));
  322         mem_free(cu, sizeof (*cu));
  323 
  324         return (NULL);
  325 }
  326 
  327 static enum clnt_stat
  328 clnt_dg_call(
  329         CLIENT          *cl,            /* client handle */
  330         struct rpc_callextra *ext,      /* call metadata */
  331         rpcproc_t       proc,           /* procedure number */
  332         struct mbuf     *args,          /* pointer to args */
  333         struct mbuf     **resultsp,     /* pointer to results */
  334         struct timeval  utimeout)       /* seconds to wait before giving up */
  335 {
  336         struct cu_data *cu = (struct cu_data *)cl->cl_private;
  337         struct cu_socket *cs;
  338         struct rpc_timers *rt;
  339         AUTH *auth;
  340         struct rpc_err *errp;
  341         enum clnt_stat stat;
  342         XDR xdrs;
  343         struct rpc_msg reply_msg;
  344         bool_t ok;
  345         int retrans;                    /* number of re-transmits so far */
  346         int nrefreshes = 2;             /* number of times to refresh cred */
  347         struct timeval *tvp;
  348         int timeout;
  349         int retransmit_time;
  350         int next_sendtime, starttime, rtt, time_waited, tv = 0;
  351         struct sockaddr *sa;
  352         socklen_t salen;
  353         uint32_t xid = 0;
  354         struct mbuf *mreq = NULL, *results;
  355         struct cu_request *cr;
  356         int error;
  357 
  358         cs = cu->cu_socket->so_rcv.sb_upcallarg;
  359         cr = malloc(sizeof(struct cu_request), M_RPC, M_WAITOK);
  360 
  361         mtx_lock(&cs->cs_lock);
  362 
  363         if (cu->cu_closing || cu->cu_closed) {
  364                 mtx_unlock(&cs->cs_lock);
  365                 free(cr, M_RPC);
  366                 return (RPC_CANTSEND);
  367         }
  368         cu->cu_threads++;
  369 
  370         if (ext) {
  371                 auth = ext->rc_auth;
  372                 errp = &ext->rc_err;
  373         } else {
  374                 auth = cl->cl_auth;
  375                 errp = &cu->cu_error;
  376         }
  377 
  378         cr->cr_client = cl;
  379         cr->cr_mrep = NULL;
  380         cr->cr_error = 0;
  381 
  382         if (cu->cu_total.tv_usec == -1) {
  383                 tvp = &utimeout; /* use supplied timeout */
  384         } else {
  385                 tvp = &cu->cu_total; /* use default timeout */
  386         }
  387         if (tvp->tv_sec || tvp->tv_usec)
  388                 timeout = tvtohz(tvp);
  389         else
  390                 timeout = 0;
  391 
  392         if (cu->cu_connect && !cu->cu_connected) {
  393                 mtx_unlock(&cs->cs_lock);
  394                 error = soconnect(cu->cu_socket,
  395                     (struct sockaddr *)&cu->cu_raddr, curthread);
  396                 mtx_lock(&cs->cs_lock);
  397                 if (error) {
  398                         errp->re_errno = error;
  399                         errp->re_status = stat = RPC_CANTSEND;
  400                         goto out;
  401                 }
  402                 cu->cu_connected = 1;
  403         }
  404         if (cu->cu_connected) {
  405                 sa = NULL;
  406                 salen = 0;
  407         } else {
  408                 sa = (struct sockaddr *)&cu->cu_raddr;
  409                 salen = cu->cu_rlen;
  410         }
  411         time_waited = 0;
  412         retrans = 0;
  413         if (ext && ext->rc_timers) {
  414                 rt = ext->rc_timers;
  415                 if (!rt->rt_rtxcur)
  416                         rt->rt_rtxcur = tvtohz(&cu->cu_wait);
  417                 retransmit_time = next_sendtime = rt->rt_rtxcur;
  418         } else {
  419                 rt = NULL;
  420                 retransmit_time = next_sendtime = tvtohz(&cu->cu_wait);
  421         }
  422 
  423         starttime = ticks;
  424 
  425 call_again:
  426         mtx_assert(&cs->cs_lock, MA_OWNED);
  427 
  428         xid = atomic_fetchadd_32(&rpc_xid, 1);
  429 
  430 send_again:
  431         mtx_unlock(&cs->cs_lock);
  432 
  433         mreq = m_gethdr(M_WAITOK, MT_DATA);
  434         KASSERT(cu->cu_mcalllen <= MHLEN, ("RPC header too big"));
  435         bcopy(cu->cu_mcallc, mreq->m_data, cu->cu_mcalllen);
  436         mreq->m_len = cu->cu_mcalllen;
  437 
  438         /*
  439          * The XID is the first thing in the request.
  440          */
  441         *mtod(mreq, uint32_t *) = htonl(xid);
  442 
  443         xdrmbuf_create(&xdrs, mreq, XDR_ENCODE);
  444 
  445         if (cu->cu_async == TRUE && args == NULL)
  446                 goto get_reply;
  447 
  448         if ((! XDR_PUTINT32(&xdrs, &proc)) ||
  449             (! AUTH_MARSHALL(auth, xid, &xdrs,
  450                 m_copym(args, 0, M_COPYALL, M_WAITOK)))) {
  451                 errp->re_status = stat = RPC_CANTENCODEARGS;
  452                 mtx_lock(&cs->cs_lock);
  453                 goto out;
  454         }
  455         mreq->m_pkthdr.len = m_length(mreq, NULL);
  456 
  457         cr->cr_xid = xid;
  458         mtx_lock(&cs->cs_lock);
  459 
  460         /*
  461          * Try to get a place in the congestion window.
  462          */
  463         while (cu->cu_sent >= cu->cu_cwnd) {
  464                 cu->cu_cwnd_wait = TRUE;
  465                 error = msleep(&cu->cu_cwnd_wait, &cs->cs_lock,
  466                     cu->cu_waitflag, "rpccwnd", 0);
  467                 if (error) {
  468                         errp->re_errno = error;
  469                         if (error == EINTR || error == ERESTART)
  470                                 errp->re_status = stat = RPC_INTR;
  471                         else
  472                                 errp->re_status = stat = RPC_CANTSEND;
  473                         goto out;
  474                 }
  475         }
  476         cu->cu_sent += CWNDSCALE;
  477 
  478         TAILQ_INSERT_TAIL(&cs->cs_pending, cr, cr_link);
  479         mtx_unlock(&cs->cs_lock);
  480 
  481         /*
  482          * sosend consumes mreq.
  483          */
  484         error = sosend(cu->cu_socket, sa, NULL, mreq, NULL, 0, curthread);
  485         mreq = NULL;
  486 
  487         /*
  488          * sub-optimal code appears here because we have
  489          * some clock time to spare while the packets are in flight.
  490          * (We assume that this is actually only executed once.)
  491          */
  492         reply_msg.acpted_rply.ar_verf.oa_flavor = AUTH_NULL;
  493         reply_msg.acpted_rply.ar_verf.oa_base = cr->cr_verf;
  494         reply_msg.acpted_rply.ar_verf.oa_length = 0;
  495         reply_msg.acpted_rply.ar_results.where = NULL;
  496         reply_msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
  497 
  498         mtx_lock(&cs->cs_lock);
  499         if (error) {
  500                 TAILQ_REMOVE(&cs->cs_pending, cr, cr_link);
  501                 errp->re_errno = error;
  502                 errp->re_status = stat = RPC_CANTSEND;
  503                 cu->cu_sent -= CWNDSCALE;
  504                 if (cu->cu_cwnd_wait) {
  505                         cu->cu_cwnd_wait = FALSE;
  506                         wakeup(&cu->cu_cwnd_wait);
  507                 }
  508                 goto out;
  509         }
  510 
  511         /*
  512          * Check to see if we got an upcall while waiting for the
  513          * lock.
  514          */
  515         if (cr->cr_error) {
  516                 TAILQ_REMOVE(&cs->cs_pending, cr, cr_link);
  517                 errp->re_errno = cr->cr_error;
  518                 errp->re_status = stat = RPC_CANTRECV;
  519                 cu->cu_sent -= CWNDSCALE;
  520                 if (cu->cu_cwnd_wait) {
  521                         cu->cu_cwnd_wait = FALSE;
  522                         wakeup(&cu->cu_cwnd_wait);
  523                 }
  524                 goto out;
  525         }
  526         if (cr->cr_mrep) {
  527                 TAILQ_REMOVE(&cs->cs_pending, cr, cr_link);
  528                 cu->cu_sent -= CWNDSCALE;
  529                 if (cu->cu_cwnd_wait) {
  530                         cu->cu_cwnd_wait = FALSE;
  531                         wakeup(&cu->cu_cwnd_wait);
  532                 }
  533                 goto got_reply;
  534         }
  535 
  536         /*
  537          * Hack to provide rpc-based message passing
  538          */
  539         if (timeout == 0) {
  540                 TAILQ_REMOVE(&cs->cs_pending, cr, cr_link);
  541                 errp->re_status = stat = RPC_TIMEDOUT;
  542                 cu->cu_sent -= CWNDSCALE;
  543                 if (cu->cu_cwnd_wait) {
  544                         cu->cu_cwnd_wait = FALSE;
  545                         wakeup(&cu->cu_cwnd_wait);
  546                 }
  547                 goto out;
  548         }
  549 
  550 get_reply:
  551         for (;;) {
  552                 /* Decide how long to wait. */
  553                 if (next_sendtime < timeout)
  554                         tv = next_sendtime;
  555                 else
  556                         tv = timeout;
  557                 tv -= time_waited;
  558 
  559                 if (tv > 0) {
  560                         if (cu->cu_closing || cu->cu_closed) {
  561                                 error = 0;
  562                                 cr->cr_error = ESHUTDOWN;
  563                         } else {
  564                                 error = msleep(cr, &cs->cs_lock,
  565                                     cu->cu_waitflag, cu->cu_waitchan, tv);
  566                         }
  567                 } else {
  568                         error = EWOULDBLOCK;
  569                 }
  570 
  571                 TAILQ_REMOVE(&cs->cs_pending, cr, cr_link);
  572                 cu->cu_sent -= CWNDSCALE;
  573                 if (cu->cu_cwnd_wait) {
  574                         cu->cu_cwnd_wait = FALSE;
  575                         wakeup(&cu->cu_cwnd_wait);
  576                 }
  577 
  578                 if (!error) {
  579                         /*
  580                          * We were woken up by the upcall.  If the
  581                          * upcall had a receive error, report that,
  582                          * otherwise we have a reply.
  583                          */
  584                         if (cr->cr_error) {
  585                                 errp->re_errno = cr->cr_error;
  586                                 errp->re_status = stat = RPC_CANTRECV;
  587                                 goto out;
  588                         }
  589 
  590                         cu->cu_cwnd += (CWNDSCALE * CWNDSCALE
  591                             + cu->cu_cwnd / 2) / cu->cu_cwnd;
  592                         if (cu->cu_cwnd > MAXCWND)
  593                                 cu->cu_cwnd = MAXCWND;
  594 
  595                         if (rt) {
  596                                 /*
  597                                  * Add one to the time since a tick
  598                                  * count of N means that the actual
  599                                  * time taken was somewhere between N
  600                                  * and N+1.
  601                                  */
  602                                 rtt = ticks - starttime + 1;
  603 
  604                                 /*
  605                                  * Update our estimate of the round
  606                                  * trip time using roughly the
  607                                  * algorithm described in RFC
  608                                  * 2988. Given an RTT sample R:
  609                                  *
  610                                  * RTTVAR = (1-beta) * RTTVAR + beta * |SRTT-R|
  611                                  * SRTT = (1-alpha) * SRTT + alpha * R
  612                                  *
  613                                  * where alpha = 0.125 and beta = 0.25.
  614                                  *
  615                                  * The initial retransmit timeout is
  616                                  * SRTT + 4*RTTVAR and doubles on each
  617                                  * retransmision.
  618                                  */
  619                                 if (rt->rt_srtt == 0) {
  620                                         rt->rt_srtt = rtt;
  621                                         rt->rt_deviate = rtt / 2;
  622                                 } else {
  623                                         int32_t error = rtt - rt->rt_srtt;
  624                                         rt->rt_srtt += error / 8;
  625                                         error = abs(error) - rt->rt_deviate;
  626                                         rt->rt_deviate += error / 4;
  627                                 }
  628                                 rt->rt_rtxcur = rt->rt_srtt + 4*rt->rt_deviate;
  629                         }
  630 
  631                         break;
  632                 }
  633 
  634                 /*
  635                  * The sleep returned an error so our request is still
  636                  * on the list. If we got EWOULDBLOCK, we may want to
  637                  * re-send the request.
  638                  */
  639                 if (error != EWOULDBLOCK) {
  640                         errp->re_errno = error;
  641                         if (error == EINTR || error == ERESTART)
  642                                 errp->re_status = stat = RPC_INTR;
  643                         else
  644                                 errp->re_status = stat = RPC_CANTRECV;
  645                         goto out;
  646                 }
  647 
  648                 time_waited = ticks - starttime;
  649 
  650                 /* Check for timeout. */
  651                 if (time_waited > timeout) {
  652                         errp->re_errno = EWOULDBLOCK;
  653                         errp->re_status = stat = RPC_TIMEDOUT;
  654                         goto out;
  655                 }
  656 
  657                 /* Retransmit if necessary. */          
  658                 if (time_waited >= next_sendtime) {
  659                         cu->cu_cwnd /= 2;
  660                         if (cu->cu_cwnd < CWNDSCALE)
  661                                 cu->cu_cwnd = CWNDSCALE;
  662                         if (ext && ext->rc_feedback) {
  663                                 mtx_unlock(&cs->cs_lock);
  664                                 if (retrans == 0)
  665                                         ext->rc_feedback(FEEDBACK_REXMIT1,
  666                                             proc, ext->rc_feedback_arg);
  667                                 else
  668                                         ext->rc_feedback(FEEDBACK_REXMIT2,
  669                                             proc, ext->rc_feedback_arg);
  670                                 mtx_lock(&cs->cs_lock);
  671                         }
  672                         if (cu->cu_closing || cu->cu_closed) {
  673                                 errp->re_errno = ESHUTDOWN;
  674                                 errp->re_status = stat = RPC_CANTRECV;
  675                                 goto out;
  676                         }
  677                         retrans++;
  678                         /* update retransmit_time */
  679                         if (retransmit_time < RPC_MAX_BACKOFF * hz)
  680                                 retransmit_time = 2 * retransmit_time;
  681                         next_sendtime += retransmit_time;
  682                         goto send_again;
  683                 }
  684                 cu->cu_sent += CWNDSCALE;
  685                 TAILQ_INSERT_TAIL(&cs->cs_pending, cr, cr_link);
  686         }
  687 
  688 got_reply:
  689         /*
  690          * Now decode and validate the response. We need to drop the
  691          * lock since xdr_replymsg may end up sleeping in malloc.
  692          */
  693         mtx_unlock(&cs->cs_lock);
  694 
  695         if (ext && ext->rc_feedback)
  696                 ext->rc_feedback(FEEDBACK_OK, proc, ext->rc_feedback_arg);
  697 
  698         xdrmbuf_create(&xdrs, cr->cr_mrep, XDR_DECODE);
  699         ok = xdr_replymsg(&xdrs, &reply_msg);
  700         cr->cr_mrep = NULL;
  701 
  702         if (ok) {
  703                 if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
  704                     (reply_msg.acpted_rply.ar_stat == SUCCESS))
  705                         errp->re_status = stat = RPC_SUCCESS;
  706                 else
  707                         stat = _seterr_reply(&reply_msg, &(cu->cu_error));
  708 
  709                 if (errp->re_status == RPC_SUCCESS) {
  710                         results = xdrmbuf_getall(&xdrs);
  711                         if (! AUTH_VALIDATE(auth, xid,
  712                                 &reply_msg.acpted_rply.ar_verf,
  713                                 &results)) {
  714                                 errp->re_status = stat = RPC_AUTHERROR;
  715                                 errp->re_why = AUTH_INVALIDRESP;
  716                                 if (retrans &&
  717                                     auth->ah_cred.oa_flavor == RPCSEC_GSS) {
  718                                         /*
  719                                          * If we retransmitted, its
  720                                          * possible that we will
  721                                          * receive a reply for one of
  722                                          * the earlier transmissions
  723                                          * (which will use an older
  724                                          * RPCSEC_GSS sequence
  725                                          * number). In this case, just
  726                                          * go back and listen for a
  727                                          * new reply. We could keep a
  728                                          * record of all the seq
  729                                          * numbers we have transmitted
  730                                          * so far so that we could
  731                                          * accept a reply for any of
  732                                          * them here.
  733                                          */
  734                                         XDR_DESTROY(&xdrs);
  735                                         mtx_lock(&cs->cs_lock);
  736                                         cu->cu_sent += CWNDSCALE;
  737                                         TAILQ_INSERT_TAIL(&cs->cs_pending,
  738                                             cr, cr_link);
  739                                         cr->cr_mrep = NULL;
  740                                         goto get_reply;
  741                                 }
  742                         } else {
  743                                 *resultsp = results;
  744                         }
  745                 }               /* end successful completion */
  746                 /*
  747                  * If unsuccessful AND error is an authentication error
  748                  * then refresh credentials and try again, else break
  749                  */
  750                 else if (stat == RPC_AUTHERROR)
  751                         /* maybe our credentials need to be refreshed ... */
  752                         if (nrefreshes > 0 &&
  753                             AUTH_REFRESH(auth, &reply_msg)) {
  754                                 nrefreshes--;
  755                                 XDR_DESTROY(&xdrs);
  756                                 mtx_lock(&cs->cs_lock);
  757                                 goto call_again;
  758                         }
  759                 /* end of unsuccessful completion */
  760         }       /* end of valid reply message */
  761         else {
  762                 errp->re_status = stat = RPC_CANTDECODERES;
  763 
  764         }
  765         XDR_DESTROY(&xdrs);
  766         mtx_lock(&cs->cs_lock);
  767 out:
  768         mtx_assert(&cs->cs_lock, MA_OWNED);
  769 
  770         if (mreq)
  771                 m_freem(mreq);
  772         if (cr->cr_mrep)
  773                 m_freem(cr->cr_mrep);
  774 
  775         cu->cu_threads--;
  776         if (cu->cu_closing)
  777                 wakeup(cu);
  778                 
  779         mtx_unlock(&cs->cs_lock);
  780 
  781         if (auth && stat != RPC_SUCCESS)
  782                 AUTH_VALIDATE(auth, xid, NULL, NULL);
  783 
  784         free(cr, M_RPC);
  785 
  786         return (stat);
  787 }
  788 
  789 static void
  790 clnt_dg_geterr(CLIENT *cl, struct rpc_err *errp)
  791 {
  792         struct cu_data *cu = (struct cu_data *)cl->cl_private;
  793 
  794         *errp = cu->cu_error;
  795 }
  796 
  797 static bool_t
  798 clnt_dg_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr)
  799 {
  800         XDR xdrs;
  801         bool_t dummy;
  802 
  803         xdrs.x_op = XDR_FREE;
  804         dummy = (*xdr_res)(&xdrs, res_ptr);
  805 
  806         return (dummy);
  807 }
  808 
  809 /*ARGSUSED*/
  810 static void
  811 clnt_dg_abort(CLIENT *h)
  812 {
  813 }
  814 
  815 static bool_t
  816 clnt_dg_control(CLIENT *cl, u_int request, void *info)
  817 {
  818         struct cu_data *cu = (struct cu_data *)cl->cl_private;
  819         struct cu_socket *cs;
  820         struct sockaddr *addr;
  821 
  822         cs = cu->cu_socket->so_rcv.sb_upcallarg;
  823         mtx_lock(&cs->cs_lock);
  824 
  825         switch (request) {
  826         case CLSET_FD_CLOSE:
  827                 cu->cu_closeit = TRUE;
  828                 mtx_unlock(&cs->cs_lock);
  829                 return (TRUE);
  830         case CLSET_FD_NCLOSE:
  831                 cu->cu_closeit = FALSE;
  832                 mtx_unlock(&cs->cs_lock);
  833                 return (TRUE);
  834         }
  835 
  836         /* for other requests which use info */
  837         if (info == NULL) {
  838                 mtx_unlock(&cs->cs_lock);
  839                 return (FALSE);
  840         }
  841         switch (request) {
  842         case CLSET_TIMEOUT:
  843                 if (time_not_ok((struct timeval *)info)) {
  844                         mtx_unlock(&cs->cs_lock);
  845                         return (FALSE);
  846                 }
  847                 cu->cu_total = *(struct timeval *)info;
  848                 break;
  849         case CLGET_TIMEOUT:
  850                 *(struct timeval *)info = cu->cu_total;
  851                 break;
  852         case CLSET_RETRY_TIMEOUT:
  853                 if (time_not_ok((struct timeval *)info)) {
  854                         mtx_unlock(&cs->cs_lock);
  855                         return (FALSE);
  856                 }
  857                 cu->cu_wait = *(struct timeval *)info;
  858                 break;
  859         case CLGET_RETRY_TIMEOUT:
  860                 *(struct timeval *)info = cu->cu_wait;
  861                 break;
  862         case CLGET_SVC_ADDR:
  863                 /*
  864                  * Slightly different semantics to userland - we use
  865                  * sockaddr instead of netbuf.
  866                  */
  867                 memcpy(info, &cu->cu_raddr, cu->cu_raddr.ss_len);
  868                 break;
  869         case CLSET_SVC_ADDR:            /* set to new address */
  870                 addr = (struct sockaddr *)info;
  871                 (void) memcpy(&cu->cu_raddr, addr, addr->sa_len);
  872                 break;
  873         case CLGET_XID:
  874                 *(uint32_t *)info = atomic_load_32(&rpc_xid);
  875                 break;
  876 
  877         case CLSET_XID:
  878                 /* This will set the xid of the NEXT call */
  879                 /* decrement by 1 as clnt_dg_call() increments once */
  880                 atomic_store_32(&rpc_xid, *(uint32_t *)info - 1);
  881                 break;
  882 
  883         case CLGET_VERS:
  884                 /*
  885                  * This RELIES on the information that, in the call body,
  886                  * the version number field is the fifth field from the
  887                  * beginning of the RPC header. MUST be changed if the
  888                  * call_struct is changed
  889                  */
  890                 *(uint32_t *)info =
  891                     ntohl(*(uint32_t *)(void *)(cu->cu_mcallc +
  892                     4 * BYTES_PER_XDR_UNIT));
  893                 break;
  894 
  895         case CLSET_VERS:
  896                 *(uint32_t *)(void *)(cu->cu_mcallc + 4 * BYTES_PER_XDR_UNIT)
  897                         = htonl(*(uint32_t *)info);
  898                 break;
  899 
  900         case CLGET_PROG:
  901                 /*
  902                  * This RELIES on the information that, in the call body,
  903                  * the program number field is the fourth field from the
  904                  * beginning of the RPC header. MUST be changed if the
  905                  * call_struct is changed
  906                  */
  907                 *(uint32_t *)info =
  908                     ntohl(*(uint32_t *)(void *)(cu->cu_mcallc +
  909                     3 * BYTES_PER_XDR_UNIT));
  910                 break;
  911 
  912         case CLSET_PROG:
  913                 *(uint32_t *)(void *)(cu->cu_mcallc + 3 * BYTES_PER_XDR_UNIT)
  914                         = htonl(*(uint32_t *)info);
  915                 break;
  916         case CLSET_ASYNC:
  917                 cu->cu_async = *(int *)info;
  918                 break;
  919         case CLSET_CONNECT:
  920                 cu->cu_connect = *(int *)info;
  921                 break;
  922         case CLSET_WAITCHAN:
  923                 cu->cu_waitchan = (const char *)info;
  924                 break;
  925         case CLGET_WAITCHAN:
  926                 *(const char **) info = cu->cu_waitchan;
  927                 break;
  928         case CLSET_INTERRUPTIBLE:
  929                 if (*(int *) info)
  930                         cu->cu_waitflag = PCATCH;
  931                 else
  932                         cu->cu_waitflag = 0;
  933                 break;
  934         case CLGET_INTERRUPTIBLE:
  935                 if (cu->cu_waitflag)
  936                         *(int *) info = TRUE;
  937                 else
  938                         *(int *) info = FALSE;
  939                 break;
  940         default:
  941                 mtx_unlock(&cs->cs_lock);
  942                 return (FALSE);
  943         }
  944         mtx_unlock(&cs->cs_lock);
  945         return (TRUE);
  946 }
  947 
  948 static void
  949 clnt_dg_close(CLIENT *cl)
  950 {
  951         struct cu_data *cu = (struct cu_data *)cl->cl_private;
  952         struct cu_socket *cs;
  953         struct cu_request *cr;
  954 
  955         cs = cu->cu_socket->so_rcv.sb_upcallarg;
  956         mtx_lock(&cs->cs_lock);
  957 
  958         if (cu->cu_closed) {
  959                 mtx_unlock(&cs->cs_lock);
  960                 return;
  961         }
  962 
  963         if (cu->cu_closing) {
  964                 while (cu->cu_closing)
  965                         msleep(cu, &cs->cs_lock, 0, "rpcclose", 0);
  966                 KASSERT(cu->cu_closed, ("client should be closed"));
  967                 mtx_unlock(&cs->cs_lock);
  968                 return;
  969         }
  970 
  971         /*
  972          * Abort any pending requests and wait until everyone
  973          * has finished with clnt_vc_call.
  974          */
  975         cu->cu_closing = TRUE;
  976         TAILQ_FOREACH(cr, &cs->cs_pending, cr_link) {
  977                 if (cr->cr_client == cl) {
  978                         cr->cr_xid = 0;
  979                         cr->cr_error = ESHUTDOWN;
  980                         wakeup(cr);
  981                 }
  982         }
  983 
  984         while (cu->cu_threads)
  985                 msleep(cu, &cs->cs_lock, 0, "rpcclose", 0);
  986 
  987         cu->cu_closing = FALSE;
  988         cu->cu_closed = TRUE;
  989 
  990         mtx_unlock(&cs->cs_lock);
  991         wakeup(cu);
  992 }
  993 
  994 static void
  995 clnt_dg_destroy(CLIENT *cl)
  996 {
  997         struct cu_data *cu = (struct cu_data *)cl->cl_private;
  998         struct cu_socket *cs;
  999         struct socket *so = NULL;
 1000         bool_t lastsocketref;
 1001 
 1002         cs = cu->cu_socket->so_rcv.sb_upcallarg;
 1003         clnt_dg_close(cl);
 1004 
 1005         SOCKBUF_LOCK(&cu->cu_socket->so_rcv);
 1006         mtx_lock(&cs->cs_lock);
 1007 
 1008         cs->cs_refs--;
 1009         if (cs->cs_refs == 0) {
 1010                 mtx_unlock(&cs->cs_lock);
 1011                 soupcall_clear(cu->cu_socket, SO_RCV);
 1012                 clnt_dg_upcallsdone(cu->cu_socket, cs);
 1013                 SOCKBUF_UNLOCK(&cu->cu_socket->so_rcv);
 1014                 mtx_destroy(&cs->cs_lock);
 1015                 mem_free(cs, sizeof(*cs));
 1016                 lastsocketref = TRUE;
 1017         } else {
 1018                 mtx_unlock(&cs->cs_lock);
 1019                 SOCKBUF_UNLOCK(&cu->cu_socket->so_rcv);
 1020                 lastsocketref = FALSE;
 1021         }
 1022 
 1023         if (cu->cu_closeit && lastsocketref) {
 1024                 so = cu->cu_socket;
 1025                 cu->cu_socket = NULL;
 1026         }
 1027 
 1028         if (so)
 1029                 soclose(so);
 1030 
 1031         if (cl->cl_netid && cl->cl_netid[0])
 1032                 mem_free(cl->cl_netid, strlen(cl->cl_netid) +1);
 1033         if (cl->cl_tp && cl->cl_tp[0])
 1034                 mem_free(cl->cl_tp, strlen(cl->cl_tp) +1);
 1035         mem_free(cu, sizeof (*cu));
 1036         mem_free(cl, sizeof (CLIENT));
 1037 }
 1038 
 1039 /*
 1040  * Make sure that the time is not garbage.  -1 value is allowed.
 1041  */
 1042 static bool_t
 1043 time_not_ok(struct timeval *t)
 1044 {
 1045         return (t->tv_sec < -1 || t->tv_sec > 100000000 ||
 1046                 t->tv_usec < -1 || t->tv_usec > 1000000);
 1047 }
 1048 
 1049 int
 1050 clnt_dg_soupcall(struct socket *so, void *arg, int waitflag)
 1051 {
 1052         struct cu_socket *cs = (struct cu_socket *) arg;
 1053         struct uio uio;
 1054         struct mbuf *m;
 1055         struct mbuf *control;
 1056         struct cu_request *cr;
 1057         int error, rcvflag, foundreq;
 1058         uint32_t xid;
 1059 
 1060         cs->cs_upcallrefs++;
 1061         uio.uio_resid = 1000000000;
 1062         uio.uio_td = curthread;
 1063         do {
 1064                 SOCKBUF_UNLOCK(&so->so_rcv);
 1065                 m = NULL;
 1066                 control = NULL;
 1067                 rcvflag = MSG_DONTWAIT;
 1068                 error = soreceive(so, NULL, &uio, &m, &control, &rcvflag);
 1069                 if (control)
 1070                         m_freem(control);
 1071                 SOCKBUF_LOCK(&so->so_rcv);
 1072 
 1073                 if (error == EWOULDBLOCK)
 1074                         break;
 1075 
 1076                 /*
 1077                  * If there was an error, wake up all pending
 1078                  * requests.
 1079                  */
 1080                 if (error) {
 1081                         mtx_lock(&cs->cs_lock);
 1082                         TAILQ_FOREACH(cr, &cs->cs_pending, cr_link) {
 1083                                 cr->cr_xid = 0;
 1084                                 cr->cr_error = error;
 1085                                 wakeup(cr);
 1086                         }
 1087                         mtx_unlock(&cs->cs_lock);
 1088                         break;
 1089                 }
 1090 
 1091                 /*
 1092                  * The XID is in the first uint32_t of the reply.
 1093                  */
 1094                 if (m->m_len < sizeof(xid) && m_length(m, NULL) < sizeof(xid)) {
 1095                         /*
 1096                          * Should never happen.
 1097                          */
 1098                         m_freem(m);
 1099                         continue;
 1100                 }
 1101 
 1102                 m_copydata(m, 0, sizeof(xid), (char *)&xid);
 1103                 xid = ntohl(xid);
 1104 
 1105                 /*
 1106                  * Attempt to match this reply with a pending request.
 1107                  */
 1108                 mtx_lock(&cs->cs_lock);
 1109                 foundreq = 0;
 1110                 TAILQ_FOREACH(cr, &cs->cs_pending, cr_link) {
 1111                         if (cr->cr_xid == xid) {
 1112                                 /*
 1113                                  * This one matches. We leave the
 1114                                  * reply mbuf in cr->cr_mrep. Set the
 1115                                  * XID to zero so that we will ignore
 1116                                  * any duplicated replies that arrive
 1117                                  * before clnt_dg_call removes it from
 1118                                  * the queue.
 1119                                  */
 1120                                 cr->cr_xid = 0;
 1121                                 cr->cr_mrep = m;
 1122                                 cr->cr_error = 0;
 1123                                 foundreq = 1;
 1124                                 wakeup(cr);
 1125                                 break;
 1126                         }
 1127                 }
 1128                 mtx_unlock(&cs->cs_lock);
 1129 
 1130                 /*
 1131                  * If we didn't find the matching request, just drop
 1132                  * it - its probably a repeated reply.
 1133                  */
 1134                 if (!foundreq)
 1135                         m_freem(m);
 1136         } while (m);
 1137         cs->cs_upcallrefs--;
 1138         if (cs->cs_upcallrefs < 0)
 1139                 panic("rpcdg upcall refcnt");
 1140         if (cs->cs_upcallrefs == 0)
 1141                 wakeup(&cs->cs_upcallrefs);
 1142         return (SU_OK);
 1143 }
 1144 
 1145 /*
 1146  * Wait for all upcalls in progress to complete.
 1147  */
 1148 static void
 1149 clnt_dg_upcallsdone(struct socket *so, struct cu_socket *cs)
 1150 {
 1151 
 1152         SOCKBUF_LOCK_ASSERT(&so->so_rcv);
 1153 
 1154         while (cs->cs_upcallrefs > 0)
 1155                 (void) msleep(&cs->cs_upcallrefs, SOCKBUF_MTX(&so->so_rcv), 0,
 1156                     "rpcdgup", 0);
 1157 }

Cache object: da6025923a68ad97cb2b9f1971b4b33d


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