sys/vfs/nfs/nfs_socket.c

   1 /*
   2  * Copyright (c) 1989, 1991, 1993, 1995
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Rick Macklem at The University of Guelph.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)nfs_socket.c        8.5 (Berkeley) 3/30/95
  37  * $FreeBSD: src/sys/nfs/nfs_socket.c,v 1.60.2.6 2003/03/26 01:44:46 alfred Exp $
  38  * $DragonFly: src/sys/vfs/nfs/nfs_socket.c,v 1.5 2003/07/19 21:14:45 dillon Exp $
  39  */
  40
  41 /*
  42  * Socket operations for use by nfs
  43  */
  44
  45 #include <sys/param.h>
  46 #include <sys/systm.h>
  47 #include <sys/proc.h>
  48 #include <sys/malloc.h>
  49 #include <sys/mount.h>
  50 #include <sys/kernel.h>
  51 #include <sys/mbuf.h>
  52 #include <sys/vnode.h>
  53 #include <sys/protosw.h>
  54 #include <sys/socket.h>
  55 #include <sys/socketvar.h>
  56 #include <sys/syslog.h>
  57 #include <sys/tprintf.h>
  58 #include <sys/sysctl.h>
  59 #include <sys/signalvar.h>
  60
  61 #include <netinet/in.h>
  62 #include <netinet/tcp.h>
  63
  64 #include <nfs/rpcv2.h>
  65 #include <nfs/nfsproto.h>
  66 #include <nfs/nfs.h>
  67 #include <nfs/xdr_subs.h>
  68 #include <nfs/nfsm_subs.h>
  69 #include <nfs/nfsmount.h>
  70 #include <nfs/nfsnode.h>
  71 #include <nfs/nfsrtt.h>
  72 #include <nfs/nqnfs.h>
  73
  74 #define TRUE    1
  75 #define FALSE   0
  76
  77 /*
  78  * Estimate rto for an nfs rpc sent via. an unreliable datagram.
  79  * Use the mean and mean deviation of rtt for the appropriate type of rpc
  80  * for the frequent rpcs and a default for the others.
  81  * The justification for doing "other" this way is that these rpcs
  82  * happen so infrequently that timer est. would probably be stale.
  83  * Also, since many of these rpcs are
  84  * non-idempotent, a conservative timeout is desired.
  85  * getattr, lookup - A+2D
  86  * read, write     - A+4D
  87  * other           - nm_timeo
  88  */
  89 #define NFS_RTO(n, t) \
  90         ((t) == 0 ? (n)->nm_timeo : \
  91          ((t) < 3 ? \
  92           (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \
  93           ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1)))
  94 #define NFS_SRTT(r)     (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1]
  95 #define NFS_SDRTT(r)    (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1]
  96 /*
  97  * External data, mostly RPC constants in XDR form
  98  */
  99 extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers,
 100         rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr,
 101         rpc_auth_kerb;
 102 extern u_int32_t nfs_prog, nqnfs_prog;
 103 extern time_t nqnfsstarttime;
 104 extern struct nfsstats nfsstats;
 105 extern int nfsv3_procid[NFS_NPROCS];
 106 extern int nfs_ticks;
 107
 108 /*
 109  * Defines which timer to use for the procnum.
 110  * 0 - default
 111  * 1 - getattr
 112  * 2 - lookup
 113  * 3 - read
 114  * 4 - write
 115  */
 116 static int proct[NFS_NPROCS] = {
 117         0, 1, 0, 2, 1, 3, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0,
 118         0, 0, 0,
 119 };
 120
 121 static int nfs_realign_test;
 122 static int nfs_realign_count;
 123 static int nfs_bufpackets = 4;
 124
 125 SYSCTL_DECL(_vfs_nfs);
 126
 127 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, "");
 128 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, "");
 129 SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0, "");
 130
 131
 132 /*
 133  * There is a congestion window for outstanding rpcs maintained per mount
 134  * point. The cwnd size is adjusted in roughly the way that:
 135  * Van Jacobson, Congestion avoidance and Control, In "Proceedings of
 136  * SIGCOMM '88". ACM, August 1988.
 137  * describes for TCP. The cwnd size is chopped in half on a retransmit timeout
 138  * and incremented by 1/cwnd when each rpc reply is received and a full cwnd
 139  * of rpcs is in progress.
 140  * (The sent count and cwnd are scaled for integer arith.)
 141  * Variants of "slow start" were tried and were found to be too much of a
 142  * performance hit (ave. rtt 3 times larger),
 143  * I suspect due to the large rtt that nfs rpcs have.
 144  */
 145 #define NFS_CWNDSCALE   256
 146 #define NFS_MAXCWND     (NFS_CWNDSCALE * 32)
 147 static int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, };
 148 int nfsrtton = 0;
 149 struct nfsrtt nfsrtt;
 150 struct callout_handle   nfs_timer_handle;
 151
 152 static int      nfs_msg __P((struct thread *,char *,char *));
 153 static int      nfs_rcvlock __P((struct nfsreq *));
 154 static void     nfs_rcvunlock __P((struct nfsreq *));
 155 static void     nfs_realign __P((struct mbuf **pm, int hsiz));
 156 static int      nfs_receive __P((struct nfsreq *rep, struct sockaddr **aname,
 157                                  struct mbuf **mp));
 158 static void     nfs_softterm __P((struct nfsreq *rep));
 159 static int      nfs_reconnect __P((struct nfsreq *rep));
 160 #ifndef NFS_NOSERVER
 161 static int      nfsrv_getstream __P((struct nfssvc_sock *,int));
 162
 163 int (*nfsrv3_procs[NFS_NPROCS]) __P((struct nfsrv_descript *nd,
 164                                     struct nfssvc_sock *slp,
 165                                     struct thread *td,
 166                                     struct mbuf **mreqp)) = {
 167         nfsrv_null,
 168         nfsrv_getattr,
 169         nfsrv_setattr,
 170         nfsrv_lookup,
 171         nfsrv3_access,
 172         nfsrv_readlink,
 173         nfsrv_read,
 174         nfsrv_write,
 175         nfsrv_create,
 176         nfsrv_mkdir,
 177         nfsrv_symlink,
 178         nfsrv_mknod,
 179         nfsrv_remove,
 180         nfsrv_rmdir,
 181         nfsrv_rename,
 182         nfsrv_link,
 183         nfsrv_readdir,
 184         nfsrv_readdirplus,
 185         nfsrv_statfs,
 186         nfsrv_fsinfo,
 187         nfsrv_pathconf,
 188         nfsrv_commit,
 189         nqnfsrv_getlease,
 190         nqnfsrv_vacated,
 191         nfsrv_noop,
 192         nfsrv_noop
 193 };
 194 #endif /* NFS_NOSERVER */
 195
 196 /*
 197  * Initialize sockets and congestion for a new NFS connection.
 198  * We do not free the sockaddr if error.
 199  */
 200 int
 201 nfs_connect(struct nfsmount *nmp, struct nfsreq *rep)
 202 {
 203         struct socket *so;
 204         int s, error, rcvreserve, sndreserve;
 205         int pktscale;
 206         struct sockaddr *saddr;
 207         struct sockaddr_in *sin;
 208         struct thread *td = &thread0; /* only used for socreate and sobind */
 209
 210         nmp->nm_so = (struct socket *)0;
 211         saddr = nmp->nm_nam;
 212         error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype,
 213                 nmp->nm_soproto, td);
 214         if (error)
 215                 goto bad;
 216         so = nmp->nm_so;
 217         nmp->nm_soflags = so->so_proto->pr_flags;
 218
 219         /*
 220          * Some servers require that the client port be a reserved port number.
 221          */
 222         if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) {
 223                 struct sockopt sopt;
 224                 int ip;
 225                 struct sockaddr_in ssin;
 226
 227                 bzero(&sopt, sizeof sopt);
 228                 ip = IP_PORTRANGE_LOW;
 229                 sopt.sopt_dir = SOPT_SET;
 230                 sopt.sopt_level = IPPROTO_IP;
 231                 sopt.sopt_name = IP_PORTRANGE;
 232                 sopt.sopt_val = (void *)&ip;
 233                 sopt.sopt_valsize = sizeof(ip);
 234                 sopt.sopt_td = NULL;
 235                 error = sosetopt(so, &sopt);
 236                 if (error)
 237                         goto bad;
 238                 bzero(&ssin, sizeof ssin);
 239                 sin = &ssin;
 240                 sin->sin_len = sizeof (struct sockaddr_in);
 241                 sin->sin_family = AF_INET;
 242                 sin->sin_addr.s_addr = INADDR_ANY;
 243                 sin->sin_port = htons(0);
 244                 error = sobind(so, (struct sockaddr *)sin, td);
 245                 if (error)
 246                         goto bad;
 247                 bzero(&sopt, sizeof sopt);
 248                 ip = IP_PORTRANGE_DEFAULT;
 249                 sopt.sopt_dir = SOPT_SET;
 250                 sopt.sopt_level = IPPROTO_IP;
 251                 sopt.sopt_name = IP_PORTRANGE;
 252                 sopt.sopt_val = (void *)&ip;
 253                 sopt.sopt_valsize = sizeof(ip);
 254                 sopt.sopt_td = NULL;
 255                 error = sosetopt(so, &sopt);
 256                 if (error)
 257                         goto bad;
 258         }
 259
 260         /*
 261          * Protocols that do not require connections may be optionally left
 262          * unconnected for servers that reply from a port other than NFS_PORT.
 263          */
 264         if (nmp->nm_flag & NFSMNT_NOCONN) {
 265                 if (nmp->nm_soflags & PR_CONNREQUIRED) {
 266                         error = ENOTCONN;
 267                         goto bad;
 268                 }
 269         } else {
 270                 error = soconnect(so, nmp->nm_nam, td);
 271                 if (error)
 272                         goto bad;
 273
 274                 /*
 275                  * Wait for the connection to complete. Cribbed from the
 276                  * connect system call but with the wait timing out so
 277                  * that interruptible mounts don't hang here for a long time.
 278                  */
 279                 s = splnet();
 280                 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
 281                         (void) tsleep((caddr_t)&so->so_timeo, 0,
 282                                 "nfscon", 2 * hz);
 283                         if ((so->so_state & SS_ISCONNECTING) &&
 284                             so->so_error == 0 && rep &&
 285                             (error = nfs_sigintr(nmp, rep, rep->r_td)) != 0){
 286                                 so->so_state &= ~SS_ISCONNECTING;
 287                                 splx(s);
 288                                 goto bad;
 289                         }
 290                 }
 291                 if (so->so_error) {
 292                         error = so->so_error;
 293                         so->so_error = 0;
 294                         splx(s);
 295                         goto bad;
 296                 }
 297                 splx(s);
 298         }
 299         so->so_rcv.sb_timeo = (5 * hz);
 300         so->so_snd.sb_timeo = (5 * hz);
 301
 302         /*
 303          * Get buffer reservation size from sysctl, but impose reasonable
 304          * limits.
 305          */
 306         pktscale = nfs_bufpackets;
 307         if (pktscale < 2)
 308                 pktscale = 2;
 309         if (pktscale > 64)
 310                 pktscale = 64;
 311
 312         if (nmp->nm_sotype == SOCK_DGRAM) {
 313                 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
 314                 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
 315                     NFS_MAXPKTHDR) * pktscale;
 316         } else if (nmp->nm_sotype == SOCK_SEQPACKET) {
 317                 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
 318                 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
 319                     NFS_MAXPKTHDR) * pktscale;
 320         } else {
 321                 if (nmp->nm_sotype != SOCK_STREAM)
 322                         panic("nfscon sotype");
 323                 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
 324                         struct sockopt sopt;
 325                         int val;
 326
 327                         bzero(&sopt, sizeof sopt);
 328                         sopt.sopt_level = SOL_SOCKET;
 329                         sopt.sopt_name = SO_KEEPALIVE;
 330                         sopt.sopt_val = &val;
 331                         sopt.sopt_valsize = sizeof val;
 332                         val = 1;
 333                         sosetopt(so, &sopt);
 334                 }
 335                 if (so->so_proto->pr_protocol == IPPROTO_TCP) {
 336                         struct sockopt sopt;
 337                         int val;
 338
 339                         bzero(&sopt, sizeof sopt);
 340                         sopt.sopt_level = IPPROTO_TCP;
 341                         sopt.sopt_name = TCP_NODELAY;
 342                         sopt.sopt_val = &val;
 343                         sopt.sopt_valsize = sizeof val;
 344                         val = 1;
 345                         sosetopt(so, &sopt);
 346                 }
 347                 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR +
 348                     sizeof (u_int32_t)) * pktscale;
 349                 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR +
 350                     sizeof (u_int32_t)) * pktscale;
 351         }
 352         error = soreserve(so, sndreserve, rcvreserve);
 353         if (error)
 354                 goto bad;
 355         so->so_rcv.sb_flags |= SB_NOINTR;
 356         so->so_snd.sb_flags |= SB_NOINTR;
 357
 358         /* Initialize other non-zero congestion variables */
 359         nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] =
 360                 nmp->nm_srtt[3] = (NFS_TIMEO << 3);
 361         nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] =
 362                 nmp->nm_sdrtt[3] = 0;
 363         nmp->nm_cwnd = NFS_MAXCWND / 2;     /* Initial send window */
 364         nmp->nm_sent = 0;
 365         nmp->nm_timeouts = 0;
 366         return (0);
 367
 368 bad:
 369         nfs_disconnect(nmp);
 370         return (error);
 371 }
 372
 373 /*
 374  * Reconnect routine:
 375  * Called when a connection is broken on a reliable protocol.
 376  * - clean up the old socket
 377  * - nfs_connect() again
 378  * - set R_MUSTRESEND for all outstanding requests on mount point
 379  * If this fails the mount point is DEAD!
 380  * nb: Must be called with the nfs_sndlock() set on the mount point.
 381  */
 382 static int
 383 nfs_reconnect(rep)
 384         register struct nfsreq *rep;
 385 {
 386         register struct nfsreq *rp;
 387         register struct nfsmount *nmp = rep->r_nmp;
 388         int error;
 389
 390         nfs_disconnect(nmp);
 391         while ((error = nfs_connect(nmp, rep)) != 0) {
 392                 if (error == EINTR || error == ERESTART)
 393                         return (EINTR);
 394                 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0);
 395         }
 396
 397         /*
 398          * Loop through outstanding request list and fix up all requests
 399          * on old socket.
 400          */
 401         for (rp = nfs_reqq.tqh_first; rp != 0; rp = rp->r_chain.tqe_next) {
 402                 if (rp->r_nmp == nmp)
 403                         rp->r_flags |= R_MUSTRESEND;
 404         }
 405         return (0);
 406 }
 407
 408 /*
 409  * NFS disconnect. Clean up and unlink.
 410  */
 411 void
 412 nfs_disconnect(nmp)
 413         register struct nfsmount *nmp;
 414 {
 415         register struct socket *so;
 416
 417         if (nmp->nm_so) {
 418                 so = nmp->nm_so;
 419                 nmp->nm_so = (struct socket *)0;
 420                 soshutdown(so, 2);
 421                 soclose(so);
 422         }
 423 }
 424
 425 void
 426 nfs_safedisconnect(nmp)
 427         struct nfsmount *nmp;
 428 {
 429         struct nfsreq dummyreq;
 430
 431         bzero(&dummyreq, sizeof(dummyreq));
 432         dummyreq.r_nmp = nmp;
 433         nfs_rcvlock(&dummyreq);
 434         nfs_disconnect(nmp);
 435         nfs_rcvunlock(&dummyreq);
 436 }
 437
 438 /*
 439  * This is the nfs send routine. For connection based socket types, it
 440  * must be called with an nfs_sndlock() on the socket.
 441  * "rep == NULL" indicates that it has been called from a server.
 442  * For the client side:
 443  * - return EINTR if the RPC is terminated, 0 otherwise
 444  * - set R_MUSTRESEND if the send fails for any reason
 445  * - do any cleanup required by recoverable socket errors (?)
 446  * For the server side:
 447  * - return EINTR or ERESTART if interrupted by a signal
 448  * - return EPIPE if a connection is lost for connection based sockets (TCP...)
 449  * - do any cleanup required by recoverable socket errors (?)
 450  */
 451 int
 452 nfs_send(so, nam, top, rep)
 453         register struct socket *so;
 454         struct sockaddr *nam;
 455         register struct mbuf *top;
 456         struct nfsreq *rep;
 457 {
 458         struct sockaddr *sendnam;
 459         int error, soflags, flags;
 460
 461         if (rep) {
 462                 if (rep->r_flags & R_SOFTTERM) {
 463                         m_freem(top);
 464                         return (EINTR);
 465                 }
 466                 if ((so = rep->r_nmp->nm_so) == NULL) {
 467                         rep->r_flags |= R_MUSTRESEND;
 468                         m_freem(top);
 469                         return (0);
 470                 }
 471                 rep->r_flags &= ~R_MUSTRESEND;
 472                 soflags = rep->r_nmp->nm_soflags;
 473         } else
 474                 soflags = so->so_proto->pr_flags;
 475         if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED))
 476                 sendnam = (struct sockaddr *)0;
 477         else
 478                 sendnam = nam;
 479         if (so->so_type == SOCK_SEQPACKET)
 480                 flags = MSG_EOR;
 481         else
 482                 flags = 0;
 483
 484         error = so->so_proto->pr_usrreqs->pru_sosend
 485                     (so, sendnam, 0, top, 0, flags, curthread /*XXX*/);
 486         /*
 487          * ENOBUFS for dgram sockets is transient and non fatal.
 488          * No need to log, and no need to break a soft mount.
 489          */
 490         if (error == ENOBUFS && so->so_type == SOCK_DGRAM) {
 491                 error = 0;
 492                 if (rep)                /* do backoff retransmit on client */
 493                         rep->r_flags |= R_MUSTRESEND;
 494         }
 495
 496         if (error) {
 497                 if (rep) {
 498                         log(LOG_INFO, "nfs send error %d for server %s\n",error,
 499                             rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
 500                         /*
 501                          * Deal with errors for the client side.
 502                          */
 503                         if (rep->r_flags & R_SOFTTERM)
 504                                 error = EINTR;
 505                         else
 506                                 rep->r_flags |= R_MUSTRESEND;
 507                 } else
 508                         log(LOG_INFO, "nfsd send error %d\n", error);
 509
 510                 /*
 511                  * Handle any recoverable (soft) socket errors here. (?)
 512                  */
 513                 if (error != EINTR && error != ERESTART &&
 514                         error != EWOULDBLOCK && error != EPIPE)
 515                         error = 0;
 516         }
 517         return (error);
 518 }
 519
 520 /*
 521  * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all
 522  * done by soreceive(), but for SOCK_STREAM we must deal with the Record
 523  * Mark and consolidate the data into a new mbuf list.
 524  * nb: Sometimes TCP passes the data up to soreceive() in long lists of
 525  *     small mbufs.
 526  * For SOCK_STREAM we must be very careful to read an entire record once
 527  * we have read any of it, even if the system call has been interrupted.
 528  */
 529 static int
 530 nfs_receive(struct nfsreq *rep, struct sockaddr **aname, struct mbuf **mp)
 531 {
 532         register struct socket *so;
 533         struct uio auio;
 534         struct iovec aio;
 535         register struct mbuf *m;
 536         struct mbuf *control;
 537         u_int32_t len;
 538         struct sockaddr **getnam;
 539         int error, sotype, rcvflg;
 540         struct thread *td = curthread;  /* XXX */
 541
 542         /*
 543          * Set up arguments for soreceive()
 544          */
 545         *mp = (struct mbuf *)0;
 546         *aname = (struct sockaddr *)0;
 547         sotype = rep->r_nmp->nm_sotype;
 548
 549         /*
 550          * For reliable protocols, lock against other senders/receivers
 551          * in case a reconnect is necessary.
 552          * For SOCK_STREAM, first get the Record Mark to find out how much
 553          * more there is to get.
 554          * We must lock the socket against other receivers
 555          * until we have an entire rpc request/reply.
 556          */
 557         if (sotype != SOCK_DGRAM) {
 558                 error = nfs_sndlock(rep);
 559                 if (error)
 560                         return (error);
 561 tryagain:
 562                 /*
 563                  * Check for fatal errors and resending request.
 564                  */
 565                 /*
 566                  * Ugh: If a reconnect attempt just happened, nm_so
 567                  * would have changed. NULL indicates a failed
 568                  * attempt that has essentially shut down this
 569                  * mount point.
 570                  */
 571                 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) {
 572                         nfs_sndunlock(rep);
 573                         return (EINTR);
 574                 }
 575                 so = rep->r_nmp->nm_so;
 576                 if (!so) {
 577                         error = nfs_reconnect(rep);
 578                         if (error) {
 579                                 nfs_sndunlock(rep);
 580                                 return (error);
 581                         }
 582                         goto tryagain;
 583                 }
 584                 while (rep->r_flags & R_MUSTRESEND) {
 585                         m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT);
 586                         nfsstats.rpcretries++;
 587                         error = nfs_send(so, rep->r_nmp->nm_nam, m, rep);
 588                         if (error) {
 589                                 if (error == EINTR || error == ERESTART ||
 590                                     (error = nfs_reconnect(rep)) != 0) {
 591                                         nfs_sndunlock(rep);
 592                                         return (error);
 593                                 }
 594                                 goto tryagain;
 595                         }
 596                 }
 597                 nfs_sndunlock(rep);
 598                 if (sotype == SOCK_STREAM) {
 599                         aio.iov_base = (caddr_t) &len;
 600                         aio.iov_len = sizeof(u_int32_t);
 601                         auio.uio_iov = &aio;
 602                         auio.uio_iovcnt = 1;
 603                         auio.uio_segflg = UIO_SYSSPACE;
 604                         auio.uio_rw = UIO_READ;
 605                         auio.uio_offset = 0;
 606                         auio.uio_resid = sizeof(u_int32_t);
 607                         auio.uio_td = td;
 608                         do {
 609                            rcvflg = MSG_WAITALL;
 610                            error = so->so_proto->pr_usrreqs->pru_soreceive
 611                                    (so, (struct sockaddr **)0, &auio,
 612                                     (struct mbuf **)0, (struct mbuf **)0,
 613                                     &rcvflg);
 614                            if (error == EWOULDBLOCK && rep) {
 615                                 if (rep->r_flags & R_SOFTTERM)
 616                                         return (EINTR);
 617                            }
 618                         } while (error == EWOULDBLOCK);
 619                         if (!error && auio.uio_resid > 0) {
 620                             /*
 621                              * Don't log a 0 byte receive; it means
 622                              * that the socket has been closed, and
 623                              * can happen during normal operation
 624                              * (forcible unmount or Solaris server).
 625                              */
 626                             if (auio.uio_resid != sizeof (u_int32_t))
 627                             log(LOG_INFO,
 628                                  "short receive (%d/%d) from nfs server %s\n",
 629                                  (int)(sizeof(u_int32_t) - auio.uio_resid),
 630                                  (int)sizeof(u_int32_t),
 631                                  rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
 632                             error = EPIPE;
 633                         }
 634                         if (error)
 635                                 goto errout;
 636                         len = ntohl(len) & ~0x80000000;
 637                         /*
 638                          * This is SERIOUS! We are out of sync with the sender
 639                          * and forcing a disconnect/reconnect is all I can do.
 640                          */
 641                         if (len > NFS_MAXPACKET) {
 642                             log(LOG_ERR, "%s (%d) from nfs server %s\n",
 643                                 "impossible packet length",
 644                                 len,
 645                                 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
 646                             error = EFBIG;
 647                             goto errout;
 648                         }
 649                         auio.uio_resid = len;
 650                         do {
 651                             rcvflg = MSG_WAITALL;
 652                             error =  so->so_proto->pr_usrreqs->pru_soreceive
 653                                     (so, (struct sockaddr **)0,
 654                                      &auio, mp, (struct mbuf **)0, &rcvflg);
 655                         } while (error == EWOULDBLOCK || error == EINTR ||
 656                                  error == ERESTART);
 657                         if (!error && auio.uio_resid > 0) {
 658                             if (len != auio.uio_resid)
 659                             log(LOG_INFO,
 660                                 "short receive (%d/%d) from nfs server %s\n",
 661                                 len - auio.uio_resid, len,
 662                                 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
 663                             error = EPIPE;
 664                         }
 665                 } else {
 666                         /*
 667                          * NB: Since uio_resid is big, MSG_WAITALL is ignored
 668                          * and soreceive() will return when it has either a
 669                          * control msg or a data msg.
 670                          * We have no use for control msg., but must grab them
 671                          * and then throw them away so we know what is going
 672                          * on.
 673                          */
 674                         auio.uio_resid = len = 100000000; /* Anything Big */
 675                         auio.uio_td = td;
 676                         do {
 677                             rcvflg = 0;
 678                             error =  so->so_proto->pr_usrreqs->pru_soreceive
 679                                     (so, (struct sockaddr **)0,
 680                                 &auio, mp, &control, &rcvflg);
 681                             if (control)
 682                                 m_freem(control);
 683                             if (error == EWOULDBLOCK && rep) {
 684                                 if (rep->r_flags & R_SOFTTERM)
 685                                         return (EINTR);
 686                             }
 687                         } while (error == EWOULDBLOCK ||
 688                                  (!error && *mp == NULL && control));
 689                         if ((rcvflg & MSG_EOR) == 0)
 690                                 printf("Egad!!\n");
 691                         if (!error && *mp == NULL)
 692                                 error = EPIPE;
 693                         len -= auio.uio_resid;
 694                 }
 695 errout:
 696                 if (error && error != EINTR && error != ERESTART) {
 697                         m_freem(*mp);
 698                         *mp = (struct mbuf *)0;
 699                         if (error != EPIPE)
 700                                 log(LOG_INFO,
 701                                     "receive error %d from nfs server %s\n",
 702                                     error,
 703                                  rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
 704                         error = nfs_sndlock(rep);
 705                         if (!error) {
 706                                 error = nfs_reconnect(rep);
 707                                 if (!error)
 708                                         goto tryagain;
 709                                 else
 710                                         nfs_sndunlock(rep);
 711                         }
 712                 }
 713         } else {
 714                 if ((so = rep->r_nmp->nm_so) == NULL)
 715                         return (EACCES);
 716                 if (so->so_state & SS_ISCONNECTED)
 717                         getnam = (struct sockaddr **)0;
 718                 else
 719                         getnam = aname;
 720                 auio.uio_resid = len = 1000000;
 721                 auio.uio_td = td;
 722                 do {
 723                         rcvflg = 0;
 724                         error =  so->so_proto->pr_usrreqs->pru_soreceive
 725                                 (so, getnam, &auio, mp,
 726                                 (struct mbuf **)0, &rcvflg);
 727                         if (error == EWOULDBLOCK &&
 728                             (rep->r_flags & R_SOFTTERM))
 729                                 return (EINTR);
 730                 } while (error == EWOULDBLOCK);
 731                 len -= auio.uio_resid;
 732         }
 733         if (error) {
 734                 m_freem(*mp);
 735                 *mp = (struct mbuf *)0;
 736         }
 737         /*
 738          * Search for any mbufs that are not a multiple of 4 bytes long
 739          * or with m_data not longword aligned.
 740          * These could cause pointer alignment problems, so copy them to
 741          * well aligned mbufs.
 742          */
 743         nfs_realign(mp, 5 * NFSX_UNSIGNED);
 744         return (error);
 745 }
 746
 747 /*
 748  * Implement receipt of reply on a socket.
 749  * We must search through the list of received datagrams matching them
 750  * with outstanding requests using the xid, until ours is found.
 751  */
 752 /* ARGSUSED */
 753 int
 754 nfs_reply(myrep)
 755         struct nfsreq *myrep;
 756 {
 757         register struct nfsreq *rep;
 758         register struct nfsmount *nmp = myrep->r_nmp;
 759         register int32_t t1;
 760         struct mbuf *mrep, *md;
 761         struct sockaddr *nam;
 762         u_int32_t rxid, *tl;
 763         caddr_t dpos, cp2;
 764         int error;
 765
 766         /*
 767          * Loop around until we get our own reply
 768          */
 769         for (;;) {
 770                 /*
 771                  * Lock against other receivers so that I don't get stuck in
 772                  * sbwait() after someone else has received my reply for me.
 773                  * Also necessary for connection based protocols to avoid
 774                  * race conditions during a reconnect.
 775                  * If nfs_rcvlock() returns EALREADY, that means that
 776                  * the reply has already been recieved by another
 777                  * process and we can return immediately.  In this
 778                  * case, the lock is not taken to avoid races with
 779                  * other processes.
 780                  */
 781                 error = nfs_rcvlock(myrep);
 782                 if (error == EALREADY)
 783                         return (0);
 784                 if (error)
 785                         return (error);
 786                 /*
 787                  * Get the next Rpc reply off the socket
 788                  */
 789                 error = nfs_receive(myrep, &nam, &mrep);
 790                 nfs_rcvunlock(myrep);
 791                 if (error) {
 792
 793                         /*
 794                          * Ignore routing errors on connectionless protocols??
 795                          */
 796                         if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) {
 797                                 nmp->nm_so->so_error = 0;
 798                                 if (myrep->r_flags & R_GETONEREP)
 799                                         return (0);
 800                                 continue;
 801                         }
 802                         return (error);
 803                 }
 804                 if (nam)
 805                         FREE(nam, M_SONAME);
 806
 807                 /*
 808                  * Get the xid and check that it is an rpc reply
 809                  */
 810                 md = mrep;
 811                 dpos = mtod(md, caddr_t);
 812                 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED);
 813                 rxid = *tl++;
 814                 if (*tl != rpc_reply) {
 815 #ifndef NFS_NOSERVER
 816                         if (nmp->nm_flag & NFSMNT_NQNFS) {
 817                                 if (nqnfs_callback(nmp, mrep, md, dpos))
 818                                         nfsstats.rpcinvalid++;
 819                         } else {
 820                                 nfsstats.rpcinvalid++;
 821                                 m_freem(mrep);
 822                         }
 823 #else
 824                         nfsstats.rpcinvalid++;
 825                         m_freem(mrep);
 826 #endif
 827 nfsmout:
 828                         if (myrep->r_flags & R_GETONEREP)
 829                                 return (0);
 830                         continue;
 831                 }
 832
 833                 /*
 834                  * Loop through the request list to match up the reply
 835                  * Iff no match, just drop the datagram
 836                  */
 837                 for (rep = nfs_reqq.tqh_first; rep != 0;
 838                     rep = rep->r_chain.tqe_next) {
 839                         if (rep->r_mrep == NULL && rxid == rep->r_xid) {
 840                                 /* Found it.. */
 841                                 rep->r_mrep = mrep;
 842                                 rep->r_md = md;
 843                                 rep->r_dpos = dpos;
 844                                 if (nfsrtton) {
 845                                         struct rttl *rt;
 846
 847                                         rt = &nfsrtt.rttl[nfsrtt.pos];
 848                                         rt->proc = rep->r_procnum;
 849                                         rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]);
 850                                         rt->sent = nmp->nm_sent;
 851                                         rt->cwnd = nmp->nm_cwnd;
 852                                         rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1];
 853                                         rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1];
 854                                         rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid;
 855                                         getmicrotime(&rt->tstamp);
 856                                         if (rep->r_flags & R_TIMING)
 857                                                 rt->rtt = rep->r_rtt;
 858                                         else
 859                                                 rt->rtt = 1000000;
 860                                         nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ;
 861                                 }
 862                                 /*
 863                                  * Update congestion window.
 864                                  * Do the additive increase of
 865                                  * one rpc/rtt.
 866                                  */
 867                                 if (nmp->nm_cwnd <= nmp->nm_sent) {
 868                                         nmp->nm_cwnd +=
 869                                            (NFS_CWNDSCALE * NFS_CWNDSCALE +
 870                                            (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd;
 871                                         if (nmp->nm_cwnd > NFS_MAXCWND)
 872                                                 nmp->nm_cwnd = NFS_MAXCWND;
 873                                 }
 874                                 if (rep->r_flags & R_SENT) {
 875                                         rep->r_flags &= ~R_SENT;
 876                                         nmp->nm_sent -= NFS_CWNDSCALE;
 877                                 }
 878                                 /*
 879                                  * Update rtt using a gain of 0.125 on the mean
 880                                  * and a gain of 0.25 on the deviation.
 881                                  */
 882                                 if (rep->r_flags & R_TIMING) {
 883                                         /*
 884                                          * Since the timer resolution of
 885                                          * NFS_HZ is so course, it can often
 886                                          * result in r_rtt == 0. Since
 887                                          * r_rtt == N means that the actual
 888                                          * rtt is between N+dt and N+2-dt ticks,
 889                                          * add 1.
 890                                          */
 891                                         t1 = rep->r_rtt + 1;
 892                                         t1 -= (NFS_SRTT(rep) >> 3);
 893                                         NFS_SRTT(rep) += t1;
 894                                         if (t1 < 0)
 895                                                 t1 = -t1;
 896                                         t1 -= (NFS_SDRTT(rep) >> 2);
 897                                         NFS_SDRTT(rep) += t1;
 898                                 }
 899                                 nmp->nm_timeouts = 0;
 900                                 break;
 901                         }
 902                 }
 903                 /*
 904                  * If not matched to a request, drop it.
 905                  * If it's mine, get out.
 906                  */
 907                 if (rep == 0) {
 908                         nfsstats.rpcunexpected++;
 909                         m_freem(mrep);
 910                 } else if (rep == myrep) {
 911                         if (rep->r_mrep == NULL)
 912                                 panic("nfsreply nil");
 913                         return (0);
 914                 }
 915                 if (myrep->r_flags & R_GETONEREP)
 916                         return (0);
 917         }
 918 }
 919
 920 /*
 921  * nfs_request - goes something like this
 922  *      - fill in request struct
 923  *      - links it into list
 924  *      - calls nfs_send() for first transmit
 925  *      - calls nfs_receive() to get reply
 926  *      - break down rpc header and return with nfs reply pointed to
 927  *        by mrep or error
 928  * nb: always frees up mreq mbuf list
 929  */
 930 int
 931 nfs_request(vp, mrest, procnum, td, cred, mrp, mdp, dposp)
 932         struct vnode *vp;
 933         struct mbuf *mrest;
 934         int procnum;
 935         struct thread *td;
 936         struct ucred *cred;
 937         struct mbuf **mrp;
 938         struct mbuf **mdp;
 939         caddr_t *dposp;
 940 {
 941         register struct mbuf *mrep, *m2;
 942         register struct nfsreq *rep;
 943         register u_int32_t *tl;
 944         register int i;
 945         struct nfsmount *nmp;
 946         struct mbuf *m, *md, *mheadend;
 947         struct nfsnode *np;
 948         char nickv[RPCX_NICKVERF];
 949         time_t reqtime, waituntil;
 950         caddr_t dpos, cp2;
 951         int t1, nqlflag, cachable, s, error = 0, mrest_len, auth_len, auth_type;
 952         int trylater_delay = NQ_TRYLATERDEL, trylater_cnt = 0, failed_auth = 0;
 953         int verf_len, verf_type;
 954         u_int32_t xid;
 955         u_quad_t frev;
 956         char *auth_str, *verf_str;
 957         NFSKERBKEY_T key;               /* save session key */
 958
 959         /* Reject requests while attempting a forced unmount. */
 960         if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) {
 961                 m_freem(mrest);
 962                 return (ESTALE);
 963         }
 964         nmp = VFSTONFS(vp->v_mount);
 965         MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK);
 966         rep->r_nmp = nmp;
 967         rep->r_vp = vp;
 968         rep->r_td = td;
 969         rep->r_procnum = procnum;
 970         i = 0;
 971         m = mrest;
 972         while (m) {
 973                 i += m->m_len;
 974                 m = m->m_next;
 975         }
 976         mrest_len = i;
 977
 978         /*
 979          * Get the RPC header with authorization.
 980          */
 981 kerbauth:
 982         verf_str = auth_str = (char *)0;
 983         if (nmp->nm_flag & NFSMNT_KERB) {
 984                 verf_str = nickv;
 985                 verf_len = sizeof (nickv);
 986                 auth_type = RPCAUTH_KERB4;
 987                 bzero((caddr_t)key, sizeof (key));
 988                 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str,
 989                         &auth_len, verf_str, verf_len)) {
 990                         error = nfs_getauth(nmp, rep, cred, &auth_str,
 991                                 &auth_len, verf_str, &verf_len, key);
 992                         if (error) {
 993                                 free((caddr_t)rep, M_NFSREQ);
 994                                 m_freem(mrest);
 995                                 return (error);
 996                         }
 997                 }
 998         } else {
 999                 auth_type = RPCAUTH_UNIX;
1000                 if (cred->cr_ngroups < 1)
1001                         panic("nfsreq nogrps");
1002                 auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ?
1003                         nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) +
1004                         5 * NFSX_UNSIGNED;
1005         }
1006         m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len,
1007              auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid);
1008         if (auth_str)
1009                 free(auth_str, M_TEMP);
1010
1011         /*
1012          * For stream protocols, insert a Sun RPC Record Mark.
1013          */
1014         if (nmp->nm_sotype == SOCK_STREAM) {
1015                 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT);
1016                 *mtod(m, u_int32_t *) = htonl(0x80000000 |
1017                          (m->m_pkthdr.len - NFSX_UNSIGNED));
1018         }
1019         rep->r_mreq = m;
1020         rep->r_xid = xid;
1021 tryagain:
1022         if (nmp->nm_flag & NFSMNT_SOFT)
1023                 rep->r_retry = nmp->nm_retry;
1024         else
1025                 rep->r_retry = NFS_MAXREXMIT + 1;       /* past clip limit */
1026         rep->r_rtt = rep->r_rexmit = 0;
1027         if (proct[procnum] > 0)
1028                 rep->r_flags = R_TIMING;
1029         else
1030                 rep->r_flags = 0;
1031         rep->r_mrep = NULL;
1032
1033         /*
1034          * Do the client side RPC.
1035          */
1036         nfsstats.rpcrequests++;
1037         /*
1038          * Chain request into list of outstanding requests. Be sure
1039          * to put it LAST so timer finds oldest requests first.
1040          */
1041         s = splsoftclock();
1042         TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain);
1043
1044         /* Get send time for nqnfs */
1045         reqtime = time_second;
1046
1047         /*
1048          * If backing off another request or avoiding congestion, don't
1049          * send this one now but let timer do it. If not timing a request,
1050          * do it now.
1051          */
1052         if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM ||
1053                 (nmp->nm_flag & NFSMNT_DUMBTIMR) ||
1054                 nmp->nm_sent < nmp->nm_cwnd)) {
1055                 splx(s);
1056                 if (nmp->nm_soflags & PR_CONNREQUIRED)
1057                         error = nfs_sndlock(rep);
1058                 if (!error) {
1059                         m2 = m_copym(m, 0, M_COPYALL, M_WAIT);
1060                         error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep);
1061                         if (nmp->nm_soflags & PR_CONNREQUIRED)
1062                                 nfs_sndunlock(rep);
1063                 }
1064                 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) {
1065                         nmp->nm_sent += NFS_CWNDSCALE;
1066                         rep->r_flags |= R_SENT;
1067                 }
1068         } else {
1069                 splx(s);
1070                 rep->r_rtt = -1;
1071         }
1072
1073         /*
1074          * Wait for the reply from our send or the timer's.
1075          */
1076         if (!error || error == EPIPE)
1077                 error = nfs_reply(rep);
1078
1079         /*
1080          * RPC done, unlink the request.
1081          */
1082         s = splsoftclock();
1083         TAILQ_REMOVE(&nfs_reqq, rep, r_chain);
1084         splx(s);
1085
1086         /*
1087          * Decrement the outstanding request count.
1088          */
1089         if (rep->r_flags & R_SENT) {
1090                 rep->r_flags &= ~R_SENT;        /* paranoia */
1091                 nmp->nm_sent -= NFS_CWNDSCALE;
1092         }
1093
1094         /*
1095          * If there was a successful reply and a tprintf msg.
1096          * tprintf a response.
1097          */
1098         if (!error && (rep->r_flags & R_TPRINTFMSG))
1099                 nfs_msg(rep->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname,
1100                     "is alive again");
1101         mrep = rep->r_mrep;
1102         md = rep->r_md;
1103         dpos = rep->r_dpos;
1104         if (error) {
1105                 m_freem(rep->r_mreq);
1106                 free((caddr_t)rep, M_NFSREQ);
1107                 return (error);
1108         }
1109
1110         /*
1111          * break down the rpc header and check if ok
1112          */
1113         nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1114         if (*tl++ == rpc_msgdenied) {
1115                 if (*tl == rpc_mismatch)
1116                         error = EOPNOTSUPP;
1117                 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) {
1118                         if (!failed_auth) {
1119                                 failed_auth++;
1120                                 mheadend->m_next = (struct mbuf *)0;
1121                                 m_freem(mrep);
1122                                 m_freem(rep->r_mreq);
1123                                 goto kerbauth;
1124                         } else
1125                                 error = EAUTH;
1126                 } else
1127                         error = EACCES;
1128                 m_freem(mrep);
1129                 m_freem(rep->r_mreq);
1130                 free((caddr_t)rep, M_NFSREQ);
1131                 return (error);
1132         }
1133
1134         /*
1135          * Grab any Kerberos verifier, otherwise just throw it away.
1136          */
1137         verf_type = fxdr_unsigned(int, *tl++);
1138         i = fxdr_unsigned(int32_t, *tl);
1139         if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) {
1140                 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep);
1141                 if (error)
1142                         goto nfsmout;
1143         } else if (i > 0)
1144                 nfsm_adv(nfsm_rndup(i));
1145         nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1146         /* 0 == ok */
1147         if (*tl == 0) {
1148                 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1149                 if (*tl != 0) {
1150                         error = fxdr_unsigned(int, *tl);
1151                         if ((nmp->nm_flag & NFSMNT_NFSV3) &&
1152                                 error == NFSERR_TRYLATER) {
1153                                 m_freem(mrep);
1154                                 error = 0;
1155                                 waituntil = time_second + trylater_delay;
1156                                 while (time_second < waituntil)
1157                                         (void) tsleep((caddr_t)&lbolt,
1158                                                 0, "nqnfstry", 0);
1159                                 trylater_delay *= nfs_backoff[trylater_cnt];
1160                                 if (trylater_cnt < 7)
1161                                         trylater_cnt++;
1162                                 goto tryagain;
1163                         }
1164
1165                         /*
1166                          * If the File Handle was stale, invalidate the
1167                          * lookup cache, just in case.
1168                          */
1169                         if (error == ESTALE)
1170                                 cache_purge(vp);
1171                         if (nmp->nm_flag & NFSMNT_NFSV3) {
1172                                 *mrp = mrep;
1173                                 *mdp = md;
1174                                 *dposp = dpos;
1175                                 error |= NFSERR_RETERR;
1176                         } else
1177                                 m_freem(mrep);
1178                         m_freem(rep->r_mreq);
1179                         free((caddr_t)rep, M_NFSREQ);
1180                         return (error);
1181                 }
1182
1183                 /*
1184                  * For nqnfs, get any lease in reply
1185                  */
1186                 if (nmp->nm_flag & NFSMNT_NQNFS) {
1187                         nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1188                         if (*tl) {
1189                                 np = VTONFS(vp);
1190                                 nqlflag = fxdr_unsigned(int, *tl);
1191                                 nfsm_dissect(tl, u_int32_t *, 4*NFSX_UNSIGNED);
1192                                 cachable = fxdr_unsigned(int, *tl++);
1193                                 reqtime += fxdr_unsigned(int, *tl++);
1194                                 if (reqtime > time_second) {
1195                                     frev = fxdr_hyper(tl);
1196                                     nqnfs_clientlease(nmp, np, nqlflag,
1197                                         cachable, reqtime, frev);
1198                                 }
1199                         }
1200                 }
1201                 *mrp = mrep;
1202                 *mdp = md;
1203                 *dposp = dpos;
1204                 m_freem(rep->r_mreq);
1205                 FREE((caddr_t)rep, M_NFSREQ);
1206                 return (0);
1207         }
1208         m_freem(mrep);
1209         error = EPROTONOSUPPORT;
1210 nfsmout:
1211         m_freem(rep->r_mreq);
1212         free((caddr_t)rep, M_NFSREQ);
1213         return (error);
1214 }
1215
1216 #ifndef NFS_NOSERVER
1217 /*
1218  * Generate the rpc reply header
1219  * siz arg. is used to decide if adding a cluster is worthwhile
1220  */
1221 int
1222 nfs_rephead(siz, nd, slp, err, cache, frev, mrq, mbp, bposp)
1223         int siz;
1224         struct nfsrv_descript *nd;
1225         struct nfssvc_sock *slp;
1226         int err;
1227         int cache;
1228         u_quad_t *frev;
1229         struct mbuf **mrq;
1230         struct mbuf **mbp;
1231         caddr_t *bposp;
1232 {
1233         register u_int32_t *tl;
1234         register struct mbuf *mreq;
1235         caddr_t bpos;
1236         struct mbuf *mb, *mb2;
1237
1238         MGETHDR(mreq, M_WAIT, MT_DATA);
1239         mb = mreq;
1240         /*
1241          * If this is a big reply, use a cluster else
1242          * try and leave leading space for the lower level headers.
1243          */
1244         siz += RPC_REPLYSIZ;
1245         if ((max_hdr + siz) >= MINCLSIZE) {
1246                 MCLGET(mreq, M_WAIT);
1247         } else
1248                 mreq->m_data += max_hdr;
1249         tl = mtod(mreq, u_int32_t *);
1250         mreq->m_len = 6 * NFSX_UNSIGNED;
1251         bpos = ((caddr_t)tl) + mreq->m_len;
1252         *tl++ = txdr_unsigned(nd->nd_retxid);
1253         *tl++ = rpc_reply;
1254         if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) {
1255                 *tl++ = rpc_msgdenied;
1256                 if (err & NFSERR_AUTHERR) {
1257                         *tl++ = rpc_autherr;
1258                         *tl = txdr_unsigned(err & ~NFSERR_AUTHERR);
1259                         mreq->m_len -= NFSX_UNSIGNED;
1260                         bpos -= NFSX_UNSIGNED;
1261                 } else {
1262                         *tl++ = rpc_mismatch;
1263                         *tl++ = txdr_unsigned(RPC_VER2);
1264                         *tl = txdr_unsigned(RPC_VER2);
1265                 }
1266         } else {
1267                 *tl++ = rpc_msgaccepted;
1268
1269                 /*
1270                  * For Kerberos authentication, we must send the nickname
1271                  * verifier back, otherwise just RPCAUTH_NULL.
1272                  */
1273                 if (nd->nd_flag & ND_KERBFULL) {
1274                     register struct nfsuid *nuidp;
1275                     struct timeval ktvin, ktvout;
1276
1277                     for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first;
1278                         nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1279                         if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid &&
1280                             (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp),
1281                              &nuidp->nu_haddr, nd->nd_nam2)))
1282                             break;
1283                     }
1284                     if (nuidp) {
1285                         ktvin.tv_sec =
1286                             txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1);
1287                         ktvin.tv_usec =
1288                             txdr_unsigned(nuidp->nu_timestamp.tv_usec);
1289
1290                         /*
1291                          * Encrypt the timestamp in ecb mode using the
1292                          * session key.
1293                          */
1294 #ifdef NFSKERB
1295                         XXX
1296 #endif
1297
1298                         *tl++ = rpc_auth_kerb;
1299                         *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED);
1300                         *tl = ktvout.tv_sec;
1301                         nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1302                         *tl++ = ktvout.tv_usec;
1303                         *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid);
1304                     } else {
1305                         *tl++ = 0;
1306                         *tl++ = 0;
1307                     }
1308                 } else {
1309                         *tl++ = 0;
1310                         *tl++ = 0;
1311                 }
1312                 switch (err) {
1313                 case EPROGUNAVAIL:
1314                         *tl = txdr_unsigned(RPC_PROGUNAVAIL);
1315                         break;
1316                 case EPROGMISMATCH:
1317                         *tl = txdr_unsigned(RPC_PROGMISMATCH);
1318                         nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1319                         if (nd->nd_flag & ND_NQNFS) {
1320                                 *tl++ = txdr_unsigned(3);
1321                                 *tl = txdr_unsigned(3);
1322                         } else {
1323                                 *tl++ = txdr_unsigned(2);
1324                                 *tl = txdr_unsigned(3);
1325                         }
1326                         break;
1327                 case EPROCUNAVAIL:
1328                         *tl = txdr_unsigned(RPC_PROCUNAVAIL);
1329                         break;
1330                 case EBADRPC:
1331                         *tl = txdr_unsigned(RPC_GARBAGE);
1332                         break;
1333                 default:
1334                         *tl = 0;
1335                         if (err != NFSERR_RETVOID) {
1336                                 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
1337                                 if (err)
1338                                     *tl = txdr_unsigned(nfsrv_errmap(nd, err));
1339                                 else
1340                                     *tl = 0;
1341                         }
1342                         break;
1343                 };
1344         }
1345
1346         /*
1347          * For nqnfs, piggyback lease as requested.
1348          */
1349         if ((nd->nd_flag & ND_NQNFS) && err == 0) {
1350                 if (nd->nd_flag & ND_LEASE) {
1351                         nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
1352                         *tl++ = txdr_unsigned(nd->nd_flag & ND_LEASE);
1353                         *tl++ = txdr_unsigned(cache);
1354                         *tl++ = txdr_unsigned(nd->nd_duration);
1355                         txdr_hyper(*frev, tl);
1356                 } else {
1357                         nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
1358                         *tl = 0;
1359                 }
1360         }
1361         if (mrq != NULL)
1362             *mrq = mreq;
1363         *mbp = mb;
1364         *bposp = bpos;
1365         if (err != 0 && err != NFSERR_RETVOID)
1366                 nfsstats.srvrpc_errs++;
1367         return (0);
1368 }
1369
1370
1371 #endif /* NFS_NOSERVER */
1372 /*
1373  * Nfs timer routine
1374  * Scan the nfsreq list and retranmit any requests that have timed out
1375  * To avoid retransmission attempts on STREAM sockets (in the future) make
1376  * sure to set the r_retry field to 0 (implies nm_retry == 0).
1377  */
1378 void
1379 nfs_timer(arg)
1380         void *arg;      /* never used */
1381 {
1382         register struct nfsreq *rep;
1383         register struct mbuf *m;
1384         register struct socket *so;
1385         register struct nfsmount *nmp;
1386         register int timeo;
1387         int s, error;
1388 #ifndef NFS_NOSERVER
1389         static long lasttime = 0;
1390         register struct nfssvc_sock *slp;
1391         u_quad_t cur_usec;
1392 #endif /* NFS_NOSERVER */
1393         struct thread *td = &thread0; /* XXX for credentials, will break if sleep */
1394
1395         s = splnet();
1396         for (rep = nfs_reqq.tqh_first; rep != 0; rep = rep->r_chain.tqe_next) {
1397                 nmp = rep->r_nmp;
1398                 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM))
1399                         continue;
1400                 if (nfs_sigintr(nmp, rep, rep->r_td)) {
1401                         nfs_softterm(rep);
1402                         continue;
1403                 }
1404                 if (rep->r_rtt >= 0) {
1405                         rep->r_rtt++;
1406                         if (nmp->nm_flag & NFSMNT_DUMBTIMR)
1407                                 timeo = nmp->nm_timeo;
1408                         else
1409                                 timeo = NFS_RTO(nmp, proct[rep->r_procnum]);
1410                         if (nmp->nm_timeouts > 0)
1411                                 timeo *= nfs_backoff[nmp->nm_timeouts - 1];
1412                         if (rep->r_rtt <= timeo)
1413                                 continue;
1414                         if (nmp->nm_timeouts < 8)
1415                                 nmp->nm_timeouts++;
1416                 }
1417                 /*
1418                  * Check for server not responding
1419                  */
1420                 if ((rep->r_flags & R_TPRINTFMSG) == 0 &&
1421                      rep->r_rexmit > nmp->nm_deadthresh) {
1422                         nfs_msg(rep->r_td,
1423                             nmp->nm_mountp->mnt_stat.f_mntfromname,
1424                             "not responding");
1425                         rep->r_flags |= R_TPRINTFMSG;
1426                 }
1427                 if (rep->r_rexmit >= rep->r_retry) {    /* too many */
1428                         nfsstats.rpctimeouts++;
1429                         nfs_softterm(rep);
1430                         continue;
1431                 }
1432                 if (nmp->nm_sotype != SOCK_DGRAM) {
1433                         if (++rep->r_rexmit > NFS_MAXREXMIT)
1434                                 rep->r_rexmit = NFS_MAXREXMIT;
1435                         continue;
1436                 }
1437                 if ((so = nmp->nm_so) == NULL)
1438                         continue;
1439
1440                 /*
1441                  * If there is enough space and the window allows..
1442                  *      Resend it
1443                  * Set r_rtt to -1 in case we fail to send it now.
1444                  */
1445                 rep->r_rtt = -1;
1446                 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len &&
1447                    ((nmp->nm_flag & NFSMNT_DUMBTIMR) ||
1448                     (rep->r_flags & R_SENT) ||
1449                     nmp->nm_sent < nmp->nm_cwnd) &&
1450                    (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){
1451                         if ((nmp->nm_flag & NFSMNT_NOCONN) == 0)
1452                             error = (*so->so_proto->pr_usrreqs->pru_send)
1453                                     (so, 0, m, (struct sockaddr *)0,
1454                                      (struct mbuf *)0, td);
1455                         else
1456                             error = (*so->so_proto->pr_usrreqs->pru_send)
1457                                     (so, 0, m, nmp->nm_nam, (struct mbuf *)0,
1458                                      td);
1459                         if (error) {
1460                                 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error))
1461                                         so->so_error = 0;
1462                         } else {
1463                                 /*
1464                                  * Iff first send, start timing
1465                                  * else turn timing off, backoff timer
1466                                  * and divide congestion window by 2.
1467                                  */
1468                                 if (rep->r_flags & R_SENT) {
1469                                         rep->r_flags &= ~R_TIMING;
1470                                         if (++rep->r_rexmit > NFS_MAXREXMIT)
1471                                                 rep->r_rexmit = NFS_MAXREXMIT;
1472                                         nmp->nm_cwnd >>= 1;
1473                                         if (nmp->nm_cwnd < NFS_CWNDSCALE)
1474                                                 nmp->nm_cwnd = NFS_CWNDSCALE;
1475                                         nfsstats.rpcretries++;
1476                                 } else {
1477                                         rep->r_flags |= R_SENT;
1478                                         nmp->nm_sent += NFS_CWNDSCALE;
1479                                 }
1480                                 rep->r_rtt = 0;
1481                         }
1482                 }
1483         }
1484 #ifndef NFS_NOSERVER
1485         /*
1486          * Call the nqnfs server timer once a second to handle leases.
1487          */
1488         if (lasttime != time_second) {
1489                 lasttime = time_second;
1490                 nqnfs_serverd();
1491         }
1492
1493         /*
1494          * Scan the write gathering queues for writes that need to be
1495          * completed now.
1496          */
1497         cur_usec = nfs_curusec();
1498         for (slp = nfssvc_sockhead.tqh_first; slp != 0;
1499             slp = slp->ns_chain.tqe_next) {
1500             if (slp->ns_tq.lh_first && slp->ns_tq.lh_first->nd_time<=cur_usec)
1501                 nfsrv_wakenfsd(slp);
1502         }
1503 #endif /* NFS_NOSERVER */
1504         splx(s);
1505         nfs_timer_handle = timeout(nfs_timer, (void *)0, nfs_ticks);
1506 }
1507
1508 /*
1509  * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
1510  * wait for all requests to complete. This is used by forced unmounts
1511  * to terminate any outstanding RPCs.
1512  */
1513 int
1514 nfs_nmcancelreqs(nmp)
1515         struct nfsmount *nmp;
1516 {
1517         struct nfsreq *req;
1518         int i, s;
1519
1520         s = splnet();
1521         TAILQ_FOREACH(req, &nfs_reqq, r_chain) {
1522                 if (nmp != req->r_nmp || req->r_mrep != NULL ||
1523                     (req->r_flags & R_SOFTTERM))
1524                         continue;
1525                 nfs_softterm(req);
1526         }
1527         splx(s);
1528
1529         for (i = 0; i < 30; i++) {
1530                 s = splnet();
1531                 TAILQ_FOREACH(req, &nfs_reqq, r_chain) {
1532                         if (nmp == req->r_nmp)
1533                                 break;
1534                 }
1535                 splx(s);
1536                 if (req == NULL)
1537                         return (0);
1538                 tsleep(&lbolt, 0, "nfscancel", 0);
1539         }
1540         return (EBUSY);
1541 }
1542
1543 /*
1544  * Flag a request as being about to terminate (due to NFSMNT_INT/NFSMNT_SOFT).
1545  * The nm_send count is decremented now to avoid deadlocks when the process in
1546  * soreceive() hasn't yet managed to send its own request.
1547  */
1548
1549 static void
1550 nfs_softterm(rep)
1551         struct nfsreq *rep;
1552 {
1553         rep->r_flags |= R_SOFTTERM;
1554
1555         if (rep->r_flags & R_SENT) {
1556                 rep->r_nmp->nm_sent -= NFS_CWNDSCALE;
1557                 rep->r_flags &= ~R_SENT;
1558         }
1559 }
1560
1561 /*
1562  * Test for a termination condition pending on the process.
1563  * This is used for NFSMNT_INT mounts.
1564  */
1565 int
1566 nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct thread *td)
1567 {
1568         sigset_t tmpset;
1569         struct proc *p;
1570
1571         if (rep && (rep->r_flags & R_SOFTTERM))
1572                 return (EINTR);
1573         /* Terminate all requests while attempting a forced unmount. */
1574         if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF)
1575                 return (EINTR);
1576         if (!(nmp->nm_flag & NFSMNT_INT))
1577                 return (0);
1578         KKASSERT(td);
1579         if ((p = td->td_proc) == NULL)
1580                 return (0);
1581
1582         tmpset = p->p_siglist;
1583         SIGSETNAND(tmpset, p->p_sigmask);
1584         SIGSETNAND(tmpset, p->p_sigignore);
1585         if (SIGNOTEMPTY(p->p_siglist) && NFSINT_SIGMASK(tmpset))
1586                 return (EINTR);
1587
1588         return (0);
1589 }
1590
1591 /*
1592  * Lock a socket against others.
1593  * Necessary for STREAM sockets to ensure you get an entire rpc request/reply
1594  * and also to avoid race conditions between the processes with nfs requests
1595  * in progress when a reconnect is necessary.
1596  */
1597 int
1598 nfs_sndlock(struct nfsreq *rep)
1599 {
1600         int *statep = &rep->r_nmp->nm_state;
1601         struct thread *td;
1602         int slpflag = 0, slptimeo = 0;
1603
1604         td = rep->r_td;
1605         if (rep->r_nmp->nm_flag & NFSMNT_INT)
1606                 slpflag = PCATCH;
1607         while (*statep & NFSSTA_SNDLOCK) {
1608                 if (nfs_sigintr(rep->r_nmp, rep, td))
1609                         return (EINTR);
1610                 *statep |= NFSSTA_WANTSND;
1611                 (void) tsleep((caddr_t)statep, slpflag,
1612                         "nfsndlck", slptimeo);
1613                 if (slpflag == PCATCH) {
1614                         slpflag = 0;
1615                         slptimeo = 2 * hz;
1616                 }
1617         }
1618         /* Always fail if our request has been cancelled. */
1619         if ((rep->r_flags & R_SOFTTERM))
1620                 return (EINTR);
1621         *statep |= NFSSTA_SNDLOCK;
1622         return (0);
1623 }
1624
1625 /*
1626  * Unlock the stream socket for others.
1627  */
1628 void
1629 nfs_sndunlock(rep)
1630         struct nfsreq *rep;
1631 {
1632         register int *statep = &rep->r_nmp->nm_state;
1633
1634         if ((*statep & NFSSTA_SNDLOCK) == 0)
1635                 panic("nfs sndunlock");
1636         *statep &= ~NFSSTA_SNDLOCK;
1637         if (*statep & NFSSTA_WANTSND) {
1638                 *statep &= ~NFSSTA_WANTSND;
1639                 wakeup((caddr_t)statep);
1640         }
1641 }
1642
1643 static int
1644 nfs_rcvlock(rep)
1645         register struct nfsreq *rep;
1646 {
1647         register int *statep = &rep->r_nmp->nm_state;
1648         int slpflag, slptimeo = 0;
1649
1650         if (rep->r_nmp->nm_flag & NFSMNT_INT)
1651                 slpflag = PCATCH;
1652         else
1653                 slpflag = 0;
1654         while (*statep & NFSSTA_RCVLOCK) {
1655                 if (nfs_sigintr(rep->r_nmp, rep, rep->r_td))
1656                         return (EINTR);
1657                 *statep |= NFSSTA_WANTRCV;
1658                 (void) tsleep((caddr_t)statep, slpflag, "nfsrcvlk", slptimeo);
1659                 /*
1660                  * If our reply was recieved while we were sleeping,
1661                  * then just return without taking the lock to avoid a
1662                  * situation where a single iod could 'capture' the
1663                  * recieve lock.
1664                  */
1665                 if (rep->r_mrep != NULL)
1666                         return (EALREADY);
1667                 if (slpflag == PCATCH) {
1668                         slpflag = 0;
1669                         slptimeo = 2 * hz;
1670                 }
1671         }
1672         *statep |= NFSSTA_RCVLOCK;
1673         return (0);
1674 }
1675
1676 /*
1677  * Unlock the stream socket for others.
1678  */
1679 static void
1680 nfs_rcvunlock(rep)
1681         register struct nfsreq *rep;
1682 {
1683         register int *statep = &rep->r_nmp->nm_state;
1684
1685         if ((*statep & NFSSTA_RCVLOCK) == 0)
1686                 panic("nfs rcvunlock");
1687         *statep &= ~NFSSTA_RCVLOCK;
1688         if (*statep & NFSSTA_WANTRCV) {
1689                 *statep &= ~NFSSTA_WANTRCV;
1690                 wakeup((caddr_t)statep);
1691         }
1692 }
1693
1694 /*
1695  *      nfs_realign:
1696  *
1697  *      Check for badly aligned mbuf data and realign by copying the unaligned
1698  *      portion of the data into a new mbuf chain and freeing the portions
1699  *      of the old chain that were replaced.
1700  *
1701  *      We cannot simply realign the data within the existing mbuf chain
1702  *      because the underlying buffers may contain other rpc commands and
1703  *      we cannot afford to overwrite them.
1704  *
1705  *      We would prefer to avoid this situation entirely.  The situation does
1706  *      not occur with NFS/UDP and is supposed to only occassionally occur
1707  *      with TCP.  Use vfs.nfs.realign_count and realign_test to check this.
1708  */
1709 static void
1710 nfs_realign(pm, hsiz)
1711         register struct mbuf **pm;
1712         int hsiz;
1713 {
1714         struct mbuf *m;
1715         struct mbuf *n = NULL;
1716         int off = 0;
1717
1718         ++nfs_realign_test;
1719
1720         while ((m = *pm) != NULL) {
1721                 if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) {
1722                         MGET(n, M_WAIT, MT_DATA);
1723                         if (m->m_len >= MINCLSIZE) {
1724                                 MCLGET(n, M_WAIT);
1725                         }
1726                         n->m_len = 0;
1727                         break;
1728                 }
1729                 pm = &m->m_next;
1730         }
1731
1732         /*
1733          * If n is non-NULL, loop on m copying data, then replace the
1734          * portion of the chain that had to be realigned.
1735          */
1736         if (n != NULL) {
1737                 ++nfs_realign_count;
1738                 while (m) {
1739                         m_copyback(n, off, m->m_len, mtod(m, caddr_t));
1740                         off += m->m_len;
1741                         m = m->m_next;
1742                 }
1743                 m_freem(*pm);
1744                 *pm = n;
1745         }
1746 }
1747
1748 #ifndef NFS_NOSERVER
1749
1750 /*
1751  * Parse an RPC request
1752  * - verify it
1753  * - fill in the cred struct.
1754  */
1755 int
1756 nfs_getreq(nd, nfsd, has_header)
1757         register struct nfsrv_descript *nd;
1758         struct nfsd *nfsd;
1759         int has_header;
1760 {
1761         register int len, i;
1762         register u_int32_t *tl;
1763         register int32_t t1;
1764         struct uio uio;
1765         struct iovec iov;
1766         caddr_t dpos, cp2, cp;
1767         u_int32_t nfsvers, auth_type;
1768         uid_t nickuid;
1769         int error = 0, nqnfs = 0, ticklen;
1770         struct mbuf *mrep, *md;
1771         register struct nfsuid *nuidp;
1772         struct timeval tvin, tvout;
1773 #if 0                           /* until encrypted keys are implemented */
1774         NFSKERBKEYSCHED_T keys; /* stores key schedule */
1775 #endif
1776
1777         mrep = nd->nd_mrep;
1778         md = nd->nd_md;
1779         dpos = nd->nd_dpos;
1780         if (has_header) {
1781                 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED);
1782                 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++);
1783                 if (*tl++ != rpc_call) {
1784                         m_freem(mrep);
1785                         return (EBADRPC);
1786                 }
1787         } else
1788                 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED);
1789         nd->nd_repstat = 0;
1790         nd->nd_flag = 0;
1791         if (*tl++ != rpc_vers) {
1792                 nd->nd_repstat = ERPCMISMATCH;
1793                 nd->nd_procnum = NFSPROC_NOOP;
1794                 return (0);
1795         }
1796         if (*tl != nfs_prog) {
1797                 if (*tl == nqnfs_prog)
1798                         nqnfs++;
1799                 else {
1800                         nd->nd_repstat = EPROGUNAVAIL;
1801                         nd->nd_procnum = NFSPROC_NOOP;
1802                         return (0);
1803                 }
1804         }
1805         tl++;
1806         nfsvers = fxdr_unsigned(u_int32_t, *tl++);
1807         if (((nfsvers < NFS_VER2 || nfsvers > NFS_VER3) && !nqnfs) ||
1808                 (nfsvers != NQNFS_VER3 && nqnfs)) {
1809                 nd->nd_repstat = EPROGMISMATCH;
1810                 nd->nd_procnum = NFSPROC_NOOP;
1811                 return (0);
1812         }
1813         if (nqnfs)
1814                 nd->nd_flag = (ND_NFSV3 | ND_NQNFS);
1815         else if (nfsvers == NFS_VER3)
1816                 nd->nd_flag = ND_NFSV3;
1817         nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++);
1818         if (nd->nd_procnum == NFSPROC_NULL)
1819                 return (0);
1820         if (nd->nd_procnum >= NFS_NPROCS ||
1821                 (!nqnfs && nd->nd_procnum >= NQNFSPROC_GETLEASE) ||
1822                 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) {
1823                 nd->nd_repstat = EPROCUNAVAIL;
1824                 nd->nd_procnum = NFSPROC_NOOP;
1825                 return (0);
1826         }
1827         if ((nd->nd_flag & ND_NFSV3) == 0)
1828                 nd->nd_procnum = nfsv3_procid[nd->nd_procnum];
1829         auth_type = *tl++;
1830         len = fxdr_unsigned(int, *tl++);
1831         if (len < 0 || len > RPCAUTH_MAXSIZ) {
1832                 m_freem(mrep);
1833                 return (EBADRPC);
1834         }
1835
1836         nd->nd_flag &= ~ND_KERBAUTH;
1837         /*
1838          * Handle auth_unix or auth_kerb.
1839          */
1840         if (auth_type == rpc_auth_unix) {
1841                 len = fxdr_unsigned(int, *++tl);
1842                 if (len < 0 || len > NFS_MAXNAMLEN) {
1843                         m_freem(mrep);
1844                         return (EBADRPC);
1845                 }
1846                 nfsm_adv(nfsm_rndup(len));
1847                 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1848                 bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred));
1849                 nd->nd_cr.cr_ref = 1;
1850                 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++);
1851                 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++);
1852                 len = fxdr_unsigned(int, *tl);
1853                 if (len < 0 || len > RPCAUTH_UNIXGIDS) {
1854                         m_freem(mrep);
1855                         return (EBADRPC);
1856                 }
1857                 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED);
1858                 for (i = 1; i <= len; i++)
1859                     if (i < NGROUPS)
1860                         nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++);
1861                     else
1862                         tl++;
1863                 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1);
1864                 if (nd->nd_cr.cr_ngroups > 1)
1865                     nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups);
1866                 len = fxdr_unsigned(int, *++tl);
1867                 if (len < 0 || len > RPCAUTH_MAXSIZ) {
1868                         m_freem(mrep);
1869                         return (EBADRPC);
1870                 }
1871                 if (len > 0)
1872                         nfsm_adv(nfsm_rndup(len));
1873         } else if (auth_type == rpc_auth_kerb) {
1874                 switch (fxdr_unsigned(int, *tl++)) {
1875                 case RPCAKN_FULLNAME:
1876                         ticklen = fxdr_unsigned(int, *tl);
1877                         *((u_int32_t *)nfsd->nfsd_authstr) = *tl;
1878                         uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED;
1879                         nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED;
1880                         if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) {
1881                                 m_freem(mrep);
1882                                 return (EBADRPC);
1883                         }
1884                         uio.uio_offset = 0;
1885                         uio.uio_iov = &iov;
1886                         uio.uio_iovcnt = 1;
1887                         uio.uio_segflg = UIO_SYSSPACE;
1888                         iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4];
1889                         iov.iov_len = RPCAUTH_MAXSIZ - 4;
1890                         nfsm_mtouio(&uio, uio.uio_resid);
1891                         nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1892                         if (*tl++ != rpc_auth_kerb ||
1893                                 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) {
1894                                 printf("Bad kerb verifier\n");
1895                                 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
1896                                 nd->nd_procnum = NFSPROC_NOOP;
1897                                 return (0);
1898                         }
1899                         nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED);
1900                         tl = (u_int32_t *)cp;
1901                         if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) {
1902                                 printf("Not fullname kerb verifier\n");
1903                                 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
1904                                 nd->nd_procnum = NFSPROC_NOOP;
1905                                 return (0);
1906                         }
1907                         cp += NFSX_UNSIGNED;
1908                         bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED);
1909                         nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED;
1910                         nd->nd_flag |= ND_KERBFULL;
1911                         nfsd->nfsd_flag |= NFSD_NEEDAUTH;
1912                         break;
1913                 case RPCAKN_NICKNAME:
1914                         if (len != 2 * NFSX_UNSIGNED) {
1915                                 printf("Kerb nickname short\n");
1916                                 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED);
1917                                 nd->nd_procnum = NFSPROC_NOOP;
1918                                 return (0);
1919                         }
1920                         nickuid = fxdr_unsigned(uid_t, *tl);
1921                         nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1922                         if (*tl++ != rpc_auth_kerb ||
1923                                 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) {
1924                                 printf("Kerb nick verifier bad\n");
1925                                 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
1926                                 nd->nd_procnum = NFSPROC_NOOP;
1927                                 return (0);
1928                         }
1929                         nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1930                         tvin.tv_sec = *tl++;
1931                         tvin.tv_usec = *tl;
1932
1933                         for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first;
1934                             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1935                                 if (nuidp->nu_cr.cr_uid == nickuid &&
1936                                     (!nd->nd_nam2 ||
1937                                      netaddr_match(NU_NETFAM(nuidp),
1938                                       &nuidp->nu_haddr, nd->nd_nam2)))
1939                                         break;
1940                         }
1941                         if (!nuidp) {
1942                                 nd->nd_repstat =
1943                                         (NFSERR_AUTHERR|AUTH_REJECTCRED);
1944                                 nd->nd_procnum = NFSPROC_NOOP;
1945                                 return (0);
1946                         }
1947
1948                         /*
1949                          * Now, decrypt the timestamp using the session key
1950                          * and validate it.
1951                          */
1952 #ifdef NFSKERB
1953                         XXX
1954 #endif
1955
1956                         tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec);
1957                         tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec);
1958                         if (nuidp->nu_expire < time_second ||
1959                             nuidp->nu_timestamp.tv_sec > tvout.tv_sec ||
1960                             (nuidp->nu_timestamp.tv_sec == tvout.tv_sec &&
1961                              nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) {
1962                                 nuidp->nu_expire = 0;
1963                                 nd->nd_repstat =
1964                                     (NFSERR_AUTHERR|AUTH_REJECTVERF);
1965                                 nd->nd_procnum = NFSPROC_NOOP;
1966                                 return (0);
1967                         }
1968                         nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr);
1969                         nd->nd_flag |= ND_KERBNICK;
1970                 };
1971         } else {
1972                 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED);
1973                 nd->nd_procnum = NFSPROC_NOOP;
1974                 return (0);
1975         }
1976
1977         /*
1978          * For nqnfs, get piggybacked lease request.
1979          */
1980         if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) {
1981                 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1982                 nd->nd_flag |= fxdr_unsigned(int, *tl);
1983                 if (nd->nd_flag & ND_LEASE) {
1984                         nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1985                         nd->nd_duration = fxdr_unsigned(int32_t, *tl);
1986                 } else
1987                         nd->nd_duration = NQ_MINLEASE;
1988         } else
1989                 nd->nd_duration = NQ_MINLEASE;
1990         nd->nd_md = md;
1991         nd->nd_dpos = dpos;
1992         return (0);
1993 nfsmout:
1994         return (error);
1995 }
1996
1997 #endif
1998
1999 /*
2000  * Send a message to the originating process's terminal.  The thread and/or
2001  * process may be NULL.  YYY the thread should not be NULL but there may
2002  * still be some uio_td's that are still being passed as NULL through to
2003  * nfsm_request().
2004  */
2005 static int
2006 nfs_msg(struct thread *td, char *server, char *msg)
2007 {
2008         tpr_t tpr;
2009
2010         if (td && td->td_proc)
2011                 tpr = tprintf_open(td->td_proc);
2012         else
2013                 tpr = NULL;
2014         tprintf(tpr, "nfs server %s: %s\n", server, msg);
2015         tprintf_close(tpr);
2016         return (0);
2017 }
2018
2019 #ifndef NFS_NOSERVER
2020 /*
2021  * Socket upcall routine for the nfsd sockets.
2022  * The caddr_t arg is a pointer to the "struct nfssvc_sock".
2023  * Essentially do as much as possible non-blocking, else punt and it will
2024  * be called with M_WAIT from an nfsd.
2025  */
2026 void
2027 nfsrv_rcv(so, arg, waitflag)
2028         struct socket *so;
2029         void *arg;
2030         int waitflag;
2031 {
2032         register struct nfssvc_sock *slp = (struct nfssvc_sock *)arg;
2033         register struct mbuf *m;
2034         struct mbuf *mp;
2035         struct sockaddr *nam;
2036         struct uio auio;
2037         int flags, error;
2038
2039         if ((slp->ns_flag & SLP_VALID) == 0)
2040                 return;
2041 #ifdef notdef
2042         /*
2043          * Define this to test for nfsds handling this under heavy load.
2044          */
2045         if (waitflag == M_DONTWAIT) {
2046                 slp->ns_flag |= SLP_NEEDQ; goto dorecs;
2047         }
2048 #endif
2049         auio.uio_td = NULL;
2050         if (so->so_type == SOCK_STREAM) {
2051                 /*
2052                  * If there are already records on the queue, defer soreceive()
2053                  * to an nfsd so that there is feedback to the TCP layer that
2054                  * the nfs servers are heavily loaded.
2055                  */
2056                 if (STAILQ_FIRST(&slp->ns_rec) && waitflag == M_DONTWAIT) {
2057                         slp->ns_flag |= SLP_NEEDQ;
2058                         goto dorecs;
2059                 }
2060
2061                 /*
2062                  * Do soreceive().
2063                  */
2064                 auio.uio_resid = 1000000000;
2065                 flags = MSG_DONTWAIT;
2066                 error = so->so_proto->pr_usrreqs->pru_soreceive
2067                         (so, &nam, &auio, &mp, (struct mbuf **)0, &flags);
2068                 if (error || mp == (struct mbuf *)0) {
2069                         if (error == EWOULDBLOCK)
2070                                 slp->ns_flag |= SLP_NEEDQ;
2071                         else
2072                                 slp->ns_flag |= SLP_DISCONN;
2073                         goto dorecs;
2074                 }
2075                 m = mp;
2076                 if (slp->ns_rawend) {
2077                         slp->ns_rawend->m_next = m;
2078                         slp->ns_cc += 1000000000 - auio.uio_resid;
2079                 } else {
2080                         slp->ns_raw = m;
2081                         slp->ns_cc = 1000000000 - auio.uio_resid;
2082                 }
2083                 while (m->m_next)
2084                         m = m->m_next;
2085                 slp->ns_rawend = m;
2086
2087                 /*
2088                  * Now try and parse record(s) out of the raw stream data.
2089                  */
2090                 error = nfsrv_getstream(slp, waitflag);
2091                 if (error) {
2092                         if (error == EPERM)
2093                                 slp->ns_flag |= SLP_DISCONN;
2094                         else
2095                                 slp->ns_flag |= SLP_NEEDQ;
2096                 }
2097         } else {
2098                 do {
2099                         auio.uio_resid = 1000000000;
2100                         flags = MSG_DONTWAIT;
2101                         error = so->so_proto->pr_usrreqs->pru_soreceive
2102                                 (so, &nam, &auio, &mp,
2103                                                 (struct mbuf **)0, &flags);
2104                         if (mp) {
2105                                 struct nfsrv_rec *rec;
2106                                 rec = malloc(sizeof(struct nfsrv_rec),
2107                                              M_NFSRVDESC, waitflag);
2108                                 if (!rec) {
2109                                         if (nam)
2110                                                 FREE(nam, M_SONAME);
2111                                         m_freem(mp);
2112                                         continue;
2113                                 }
2114                                 nfs_realign(&mp, 10 * NFSX_UNSIGNED);
2115                                 rec->nr_address = nam;
2116                                 rec->nr_packet = mp;
2117                                 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link);
2118                         }
2119                         if (error) {
2120                                 if ((so->so_proto->pr_flags & PR_CONNREQUIRED)
2121                                         && error != EWOULDBLOCK) {
2122                                         slp->ns_flag |= SLP_DISCONN;
2123                                         goto dorecs;
2124                                 }
2125                         }
2126                 } while (mp);
2127         }
2128
2129         /*
2130          * Now try and process the request records, non-blocking.
2131          */
2132 dorecs:
2133         if (waitflag == M_DONTWAIT &&
2134                 (STAILQ_FIRST(&slp->ns_rec)
2135                  || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN))))
2136                 nfsrv_wakenfsd(slp);
2137 }
2138
2139 /*
2140  * Try and extract an RPC request from the mbuf data list received on a
2141  * stream socket. The "waitflag" argument indicates whether or not it
2142  * can sleep.
2143  */
2144 static int
2145 nfsrv_getstream(slp, waitflag)
2146         register struct nfssvc_sock *slp;
2147         int waitflag;
2148 {
2149         register struct mbuf *m, **mpp;
2150         register char *cp1, *cp2;
2151         register int len;
2152         struct mbuf *om, *m2, *recm;
2153         u_int32_t recmark;
2154
2155         if (slp->ns_flag & SLP_GETSTREAM)
2156                 panic("nfs getstream");
2157         slp->ns_flag |= SLP_GETSTREAM;
2158         for (;;) {
2159             if (slp->ns_reclen == 0) {
2160                 if (slp->ns_cc < NFSX_UNSIGNED) {
2161                         slp->ns_flag &= ~SLP_GETSTREAM;
2162                         return (0);
2163                 }
2164                 m = slp->ns_raw;
2165                 if (m->m_len >= NFSX_UNSIGNED) {
2166                         bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED);
2167                         m->m_data += NFSX_UNSIGNED;
2168                         m->m_len -= NFSX_UNSIGNED;
2169                 } else {
2170                         cp1 = (caddr_t)&recmark;
2171                         cp2 = mtod(m, caddr_t);
2172                         while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) {
2173                                 while (m->m_len == 0) {
2174                                         m = m->m_next;
2175                                         cp2 = mtod(m, caddr_t);
2176                                 }
2177                                 *cp1++ = *cp2++;
2178                                 m->m_data++;
2179                                 m->m_len--;
2180                         }
2181                 }
2182                 slp->ns_cc -= NFSX_UNSIGNED;
2183                 recmark = ntohl(recmark);
2184                 slp->ns_reclen = recmark & ~0x80000000;
2185                 if (recmark & 0x80000000)
2186                         slp->ns_flag |= SLP_LASTFRAG;
2187                 else
2188                         slp->ns_flag &= ~SLP_LASTFRAG;
2189                 if (slp->ns_reclen > NFS_MAXPACKET) {
2190                         slp->ns_flag &= ~SLP_GETSTREAM;
2191                         return (EPERM);
2192                 }
2193             }
2194
2195             /*
2196              * Now get the record part.
2197              *
2198              * Note that slp->ns_reclen may be 0.  Linux sometimes
2199              * generates 0-length RPCs
2200              */
2201             recm = NULL;
2202             if (slp->ns_cc == slp->ns_reclen) {
2203                 recm = slp->ns_raw;
2204                 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0;
2205                 slp->ns_cc = slp->ns_reclen = 0;
2206             } else if (slp->ns_cc > slp->ns_reclen) {
2207                 len = 0;
2208                 m = slp->ns_raw;
2209                 om = (struct mbuf *)0;
2210
2211                 while (len < slp->ns_reclen) {
2212                         if ((len + m->m_len) > slp->ns_reclen) {
2213                                 m2 = m_copym(m, 0, slp->ns_reclen - len,
2214                                         waitflag);
2215                                 if (m2) {
2216                                         if (om) {
2217                                                 om->m_next = m2;
2218                                                 recm = slp->ns_raw;
2219                                         } else
2220                                                 recm = m2;
2221                                         m->m_data += slp->ns_reclen - len;
2222                                         m->m_len -= slp->ns_reclen - len;
2223                                         len = slp->ns_reclen;
2224                                 } else {
2225                                         slp->ns_flag &= ~SLP_GETSTREAM;
2226                                         return (EWOULDBLOCK);
2227                                 }
2228                         } else if ((len + m->m_len) == slp->ns_reclen) {
2229                                 om = m;
2230                                 len += m->m_len;
2231                                 m = m->m_next;
2232                                 recm = slp->ns_raw;
2233                                 om->m_next = (struct mbuf *)0;
2234                         } else {
2235                                 om = m;
2236                                 len += m->m_len;
2237                                 m = m->m_next;
2238                         }
2239                 }
2240                 slp->ns_raw = m;
2241                 slp->ns_cc -= len;
2242                 slp->ns_reclen = 0;
2243             } else {
2244                 slp->ns_flag &= ~SLP_GETSTREAM;
2245                 return (0);
2246             }
2247
2248             /*
2249              * Accumulate the fragments into a record.
2250              */
2251             mpp = &slp->ns_frag;
2252             while (*mpp)
2253                 mpp = &((*mpp)->m_next);
2254             *mpp = recm;
2255             if (slp->ns_flag & SLP_LASTFRAG) {
2256                 struct nfsrv_rec *rec;
2257                 rec = malloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, waitflag);
2258                 if (!rec) {
2259                     m_freem(slp->ns_frag);
2260                 } else {
2261                     nfs_realign(&slp->ns_frag, 10 * NFSX_UNSIGNED);
2262                     rec->nr_address = (struct sockaddr *)0;
2263                     rec->nr_packet = slp->ns_frag;
2264                     STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link);
2265                 }
2266                 slp->ns_frag = (struct mbuf *)0;
2267             }
2268         }
2269 }
2270
2271 /*
2272  * Parse an RPC header.
2273  */
2274 int
2275 nfsrv_dorec(slp, nfsd, ndp)
2276         register struct nfssvc_sock *slp;
2277         struct nfsd *nfsd;
2278         struct nfsrv_descript **ndp;
2279 {
2280         struct nfsrv_rec *rec;
2281         register struct mbuf *m;
2282         struct sockaddr *nam;
2283         register struct nfsrv_descript *nd;
2284         int error;
2285
2286         *ndp = NULL;
2287         if ((slp->ns_flag & SLP_VALID) == 0 || !STAILQ_FIRST(&slp->ns_rec))
2288                 return (ENOBUFS);
2289         rec = STAILQ_FIRST(&slp->ns_rec);
2290         STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
2291         nam = rec->nr_address;
2292         m = rec->nr_packet;
2293         free(rec, M_NFSRVDESC);
2294         MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript),
2295                 M_NFSRVDESC, M_WAITOK);
2296         nd->nd_md = nd->nd_mrep = m;
2297         nd->nd_nam2 = nam;
2298         nd->nd_dpos = mtod(m, caddr_t);
2299         error = nfs_getreq(nd, nfsd, TRUE);
2300         if (error) {
2301                 if (nam) {
2302                         FREE(nam, M_SONAME);
2303                 }
2304                 free((caddr_t)nd, M_NFSRVDESC);
2305                 return (error);
2306         }
2307         *ndp = nd;
2308         nfsd->nfsd_nd = nd;
2309         return (0);
2310 }
2311
2312 /*
2313  * Search for a sleeping nfsd and wake it up.
2314  * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the
2315  * running nfsds will go look for the work in the nfssvc_sock list.
2316  */
2317 void
2318 nfsrv_wakenfsd(slp)
2319         struct nfssvc_sock *slp;
2320 {
2321         register struct nfsd *nd;
2322
2323         if ((slp->ns_flag & SLP_VALID) == 0)
2324                 return;
2325         for (nd = nfsd_head.tqh_first; nd != 0; nd = nd->nfsd_chain.tqe_next) {
2326                 if (nd->nfsd_flag & NFSD_WAITING) {
2327                         nd->nfsd_flag &= ~NFSD_WAITING;
2328                         if (nd->nfsd_slp)
2329                                 panic("nfsd wakeup");
2330                         slp->ns_sref++;
2331                         nd->nfsd_slp = slp;
2332                         wakeup((caddr_t)nd);
2333                         return;
2334                 }
2335         }
2336         slp->ns_flag |= SLP_DOREC;
2337         nfsd_head_flag |= NFSD_CHECKSLP;
2338 }
2339 #endif /* NFS_NOSERVER */