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 1.13 2004/03/05 16:57:16 hsu 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/resourcevar.h>
  55 #include <sys/socket.h>
  56 #include <sys/socketvar.h>
  57 #include <sys/socketops.h>
  58 #include <sys/syslog.h>
  59 #include <sys/thread.h>
  60 #include <sys/tprintf.h>
  61 #include <sys/sysctl.h>
  62 #include <sys/signalvar.h>
  63
  64 #include <netinet/in.h>
  65 #include <netinet/tcp.h>
  66
  67 #include "rpcv2.h"
  68 #include "nfsproto.h"
  69 #include "nfs.h"
  70 #include "xdr_subs.h"
  71 #include "nfsm_subs.h"
  72 #include "nfsmount.h"
  73 #include "nfsnode.h"
  74 #include "nfsrtt.h"
  75 #include "nqnfs.h"
  76
  77 #define TRUE    1
  78 #define FALSE   0
  79
  80 /*
  81  * Estimate rto for an nfs rpc sent via. an unreliable datagram.
  82  * Use the mean and mean deviation of rtt for the appropriate type of rpc
  83  * for the frequent rpcs and a default for the others.
  84  * The justification for doing "other" this way is that these rpcs
  85  * happen so infrequently that timer est. would probably be stale.
  86  * Also, since many of these rpcs are
  87  * non-idempotent, a conservative timeout is desired.
  88  * getattr, lookup - A+2D
  89  * read, write     - A+4D
  90  * other           - nm_timeo
  91  */
  92 #define NFS_RTO(n, t) \
  93         ((t) == 0 ? (n)->nm_timeo : \
  94          ((t) < 3 ? \
  95           (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \
  96           ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1)))
  97 #define NFS_SRTT(r)     (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1]
  98 #define NFS_SDRTT(r)    (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1]
  99 /*
 100  * External data, mostly RPC constants in XDR form
 101  */
 102 extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers,
 103         rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr,
 104         rpc_auth_kerb;
 105 extern u_int32_t nfs_prog, nqnfs_prog;
 106 extern time_t nqnfsstarttime;
 107 extern struct nfsstats nfsstats;
 108 extern int nfsv3_procid[NFS_NPROCS];
 109 extern int nfs_ticks;
 110
 111 /*
 112  * Defines which timer to use for the procnum.
 113  * 0 - default
 114  * 1 - getattr
 115  * 2 - lookup
 116  * 3 - read
 117  * 4 - write
 118  */
 119 static int proct[NFS_NPROCS] = {
 120         0, 1, 0, 2, 1, 3, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0,
 121         0, 0, 0,
 122 };
 123
 124 static int nfs_realign_test;
 125 static int nfs_realign_count;
 126 static int nfs_bufpackets = 4;
 127
 128 SYSCTL_DECL(_vfs_nfs);
 129
 130 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, "");
 131 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, "");
 132 SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0, "");
 133
 134
 135 /*
 136  * There is a congestion window for outstanding rpcs maintained per mount
 137  * point. The cwnd size is adjusted in roughly the way that:
 138  * Van Jacobson, Congestion avoidance and Control, In "Proceedings of
 139  * SIGCOMM '88". ACM, August 1988.
 140  * describes for TCP. The cwnd size is chopped in half on a retransmit timeout
 141  * and incremented by 1/cwnd when each rpc reply is received and a full cwnd
 142  * of rpcs is in progress.
 143  * (The sent count and cwnd are scaled for integer arith.)
 144  * Variants of "slow start" were tried and were found to be too much of a
 145  * performance hit (ave. rtt 3 times larger),
 146  * I suspect due to the large rtt that nfs rpcs have.
 147  */
 148 #define NFS_CWNDSCALE   256
 149 #define NFS_MAXCWND     (NFS_CWNDSCALE * 32)
 150 static int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, };
 151 int nfsrtton = 0;
 152 struct nfsrtt nfsrtt;
 153 struct callout_handle   nfs_timer_handle;
 154
 155 static int      nfs_msg (struct thread *,char *,char *);
 156 static int      nfs_rcvlock (struct nfsreq *);
 157 static void     nfs_rcvunlock (struct nfsreq *);
 158 static void     nfs_realign (struct mbuf **pm, int hsiz);
 159 static int      nfs_receive (struct nfsreq *rep, struct sockaddr **aname,
 160                                  struct mbuf **mp);
 161 static void     nfs_softterm (struct nfsreq *rep);
 162 static int      nfs_reconnect (struct nfsreq *rep);
 163 #ifndef NFS_NOSERVER
 164 static int      nfsrv_getstream (struct nfssvc_sock *,int);
 165
 166 int (*nfsrv3_procs[NFS_NPROCS]) (struct nfsrv_descript *nd,
 167                                     struct nfssvc_sock *slp,
 168                                     struct thread *td,
 169                                     struct mbuf **mreqp) = {
 170         nfsrv_null,
 171         nfsrv_getattr,
 172         nfsrv_setattr,
 173         nfsrv_lookup,
 174         nfsrv3_access,
 175         nfsrv_readlink,
 176         nfsrv_read,
 177         nfsrv_write,
 178         nfsrv_create,
 179         nfsrv_mkdir,
 180         nfsrv_symlink,
 181         nfsrv_mknod,
 182         nfsrv_remove,
 183         nfsrv_rmdir,
 184         nfsrv_rename,
 185         nfsrv_link,
 186         nfsrv_readdir,
 187         nfsrv_readdirplus,
 188         nfsrv_statfs,
 189         nfsrv_fsinfo,
 190         nfsrv_pathconf,
 191         nfsrv_commit,
 192         nqnfsrv_getlease,
 193         nqnfsrv_vacated,
 194         nfsrv_noop,
 195         nfsrv_noop
 196 };
 197 #endif /* NFS_NOSERVER */
 198
 199 /*
 200  * Initialize sockets and congestion for a new NFS connection.
 201  * We do not free the sockaddr if error.
 202  */
 203 int
 204 nfs_connect(struct nfsmount *nmp, struct nfsreq *rep)
 205 {
 206         struct socket *so;
 207         int s, error, rcvreserve, sndreserve;
 208         int pktscale;
 209         struct sockaddr *saddr;
 210         struct sockaddr_in *sin;
 211         struct thread *td = &thread0; /* only used for socreate and sobind */
 212
 213         nmp->nm_so = (struct socket *)0;
 214         saddr = nmp->nm_nam;
 215         error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype,
 216                 nmp->nm_soproto, td);
 217         if (error)
 218                 goto bad;
 219         so = nmp->nm_so;
 220         nmp->nm_soflags = so->so_proto->pr_flags;
 221
 222         /*
 223          * Some servers require that the client port be a reserved port number.
 224          */
 225         if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) {
 226                 struct sockopt sopt;
 227                 int ip;
 228                 struct sockaddr_in ssin;
 229
 230                 bzero(&sopt, sizeof sopt);
 231                 ip = IP_PORTRANGE_LOW;
 232                 sopt.sopt_dir = SOPT_SET;
 233                 sopt.sopt_level = IPPROTO_IP;
 234                 sopt.sopt_name = IP_PORTRANGE;
 235                 sopt.sopt_val = (void *)&ip;
 236                 sopt.sopt_valsize = sizeof(ip);
 237                 sopt.sopt_td = NULL;
 238                 error = sosetopt(so, &sopt);
 239                 if (error)
 240                         goto bad;
 241                 bzero(&ssin, sizeof ssin);
 242                 sin = &ssin;
 243                 sin->sin_len = sizeof (struct sockaddr_in);
 244                 sin->sin_family = AF_INET;
 245                 sin->sin_addr.s_addr = INADDR_ANY;
 246                 sin->sin_port = htons(0);
 247                 error = sobind(so, (struct sockaddr *)sin, td);
 248                 if (error)
 249                         goto bad;
 250                 bzero(&sopt, sizeof sopt);
 251                 ip = IP_PORTRANGE_DEFAULT;
 252                 sopt.sopt_dir = SOPT_SET;
 253                 sopt.sopt_level = IPPROTO_IP;
 254                 sopt.sopt_name = IP_PORTRANGE;
 255                 sopt.sopt_val = (void *)&ip;
 256                 sopt.sopt_valsize = sizeof(ip);
 257                 sopt.sopt_td = NULL;
 258                 error = sosetopt(so, &sopt);
 259                 if (error)
 260                         goto bad;
 261         }
 262
 263         /*
 264          * Protocols that do not require connections may be optionally left
 265          * unconnected for servers that reply from a port other than NFS_PORT.
 266          */
 267         if (nmp->nm_flag & NFSMNT_NOCONN) {
 268                 if (nmp->nm_soflags & PR_CONNREQUIRED) {
 269                         error = ENOTCONN;
 270                         goto bad;
 271                 }
 272         } else {
 273                 error = soconnect(so, nmp->nm_nam, td);
 274                 if (error)
 275                         goto bad;
 276
 277                 /*
 278                  * Wait for the connection to complete. Cribbed from the
 279                  * connect system call but with the wait timing out so
 280                  * that interruptible mounts don't hang here for a long time.
 281                  */
 282                 s = splnet();
 283                 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
 284                         (void) tsleep((caddr_t)&so->so_timeo, 0,
 285                                 "nfscon", 2 * hz);
 286                         if ((so->so_state & SS_ISCONNECTING) &&
 287                             so->so_error == 0 && rep &&
 288                             (error = nfs_sigintr(nmp, rep, rep->r_td)) != 0){
 289                                 so->so_state &= ~SS_ISCONNECTING;
 290                                 splx(s);
 291                                 goto bad;
 292                         }
 293                 }
 294                 if (so->so_error) {
 295                         error = so->so_error;
 296                         so->so_error = 0;
 297                         splx(s);
 298                         goto bad;
 299                 }
 300                 splx(s);
 301         }
 302         so->so_rcv.sb_timeo = (5 * hz);
 303         so->so_snd.sb_timeo = (5 * hz);
 304
 305         /*
 306          * Get buffer reservation size from sysctl, but impose reasonable
 307          * limits.
 308          */
 309         pktscale = nfs_bufpackets;
 310         if (pktscale < 2)
 311                 pktscale = 2;
 312         if (pktscale > 64)
 313                 pktscale = 64;
 314
 315         if (nmp->nm_sotype == SOCK_DGRAM) {
 316                 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
 317                 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
 318                     NFS_MAXPKTHDR) * pktscale;
 319         } else if (nmp->nm_sotype == SOCK_SEQPACKET) {
 320                 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
 321                 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
 322                     NFS_MAXPKTHDR) * pktscale;
 323         } else {
 324                 if (nmp->nm_sotype != SOCK_STREAM)
 325                         panic("nfscon sotype");
 326                 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
 327                         struct sockopt sopt;
 328                         int val;
 329
 330                         bzero(&sopt, sizeof sopt);
 331                         sopt.sopt_level = SOL_SOCKET;
 332                         sopt.sopt_name = SO_KEEPALIVE;
 333                         sopt.sopt_val = &val;
 334                         sopt.sopt_valsize = sizeof val;
 335                         val = 1;
 336                         sosetopt(so, &sopt);
 337                 }
 338                 if (so->so_proto->pr_protocol == IPPROTO_TCP) {
 339                         struct sockopt sopt;
 340                         int val;
 341
 342                         bzero(&sopt, sizeof sopt);
 343                         sopt.sopt_level = IPPROTO_TCP;
 344                         sopt.sopt_name = TCP_NODELAY;
 345                         sopt.sopt_val = &val;
 346                         sopt.sopt_valsize = sizeof val;
 347                         val = 1;
 348                         sosetopt(so, &sopt);
 349                 }
 350                 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR +
 351                     sizeof (u_int32_t)) * pktscale;
 352                 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR +
 353                     sizeof (u_int32_t)) * pktscale;
 354         }
 355         error = soreserve(so, sndreserve, rcvreserve,
 356                           &td->td_proc->p_rlimit[RLIMIT_SBSIZE]);
 357         if (error)
 358                 goto bad;
 359         so->so_rcv.sb_flags |= SB_NOINTR;
 360         so->so_snd.sb_flags |= SB_NOINTR;
 361
 362         /* Initialize other non-zero congestion variables */
 363         nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] =
 364                 nmp->nm_srtt[3] = (NFS_TIMEO << 3);
 365         nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] =
 366                 nmp->nm_sdrtt[3] = 0;
 367         nmp->nm_cwnd = NFS_MAXCWND / 2;     /* Initial send window */
 368         nmp->nm_sent = 0;
 369         nmp->nm_timeouts = 0;
 370         return (0);
 371
 372 bad:
 373         nfs_disconnect(nmp);
 374         return (error);
 375 }
 376
 377 /*
 378  * Reconnect routine:
 379  * Called when a connection is broken on a reliable protocol.
 380  * - clean up the old socket
 381  * - nfs_connect() again
 382  * - set R_MUSTRESEND for all outstanding requests on mount point
 383  * If this fails the mount point is DEAD!
 384  * nb: Must be called with the nfs_sndlock() set on the mount point.
 385  */
 386 static int
 387 nfs_reconnect(rep)
 388         struct nfsreq *rep;
 389 {
 390         struct nfsreq *rp;
 391         struct nfsmount *nmp = rep->r_nmp;
 392         int error;
 393
 394         nfs_disconnect(nmp);
 395         while ((error = nfs_connect(nmp, rep)) != 0) {
 396                 if (error == EINTR || error == ERESTART)
 397                         return (EINTR);
 398                 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0);
 399         }
 400
 401         /*
 402          * Loop through outstanding request list and fix up all requests
 403          * on old socket.
 404          */
 405         for (rp = nfs_reqq.tqh_first; rp != 0; rp = rp->r_chain.tqe_next) {
 406                 if (rp->r_nmp == nmp)
 407                         rp->r_flags |= R_MUSTRESEND;
 408         }
 409         return (0);
 410 }
 411
 412 /*
 413  * NFS disconnect. Clean up and unlink.
 414  */
 415 void
 416 nfs_disconnect(nmp)
 417         struct nfsmount *nmp;
 418 {
 419         struct socket *so;
 420
 421         if (nmp->nm_so) {
 422                 so = nmp->nm_so;
 423                 nmp->nm_so = (struct socket *)0;
 424                 soshutdown(so, 2);
 425                 soclose(so);
 426         }
 427 }
 428
 429 void
 430 nfs_safedisconnect(nmp)
 431         struct nfsmount *nmp;
 432 {
 433         struct nfsreq dummyreq;
 434
 435         bzero(&dummyreq, sizeof(dummyreq));
 436         dummyreq.r_nmp = nmp;
 437         dummyreq.r_td = NULL;
 438         nfs_rcvlock(&dummyreq);
 439         nfs_disconnect(nmp);
 440         nfs_rcvunlock(&dummyreq);
 441 }
 442
 443 /*
 444  * This is the nfs send routine. For connection based socket types, it
 445  * must be called with an nfs_sndlock() on the socket.
 446  * "rep == NULL" indicates that it has been called from a server.
 447  * For the client side:
 448  * - return EINTR if the RPC is terminated, 0 otherwise
 449  * - set R_MUSTRESEND if the send fails for any reason
 450  * - do any cleanup required by recoverable socket errors (?)
 451  * For the server side:
 452  * - return EINTR or ERESTART if interrupted by a signal
 453  * - return EPIPE if a connection is lost for connection based sockets (TCP...)
 454  * - do any cleanup required by recoverable socket errors (?)
 455  */
 456 int
 457 nfs_send(so, nam, top, rep)
 458         struct socket *so;
 459         struct sockaddr *nam;
 460         struct mbuf *top;
 461         struct nfsreq *rep;
 462 {
 463         struct sockaddr *sendnam;
 464         int error, soflags, flags;
 465
 466         if (rep) {
 467                 if (rep->r_flags & R_SOFTTERM) {
 468                         m_freem(top);
 469                         return (EINTR);
 470                 }
 471                 if ((so = rep->r_nmp->nm_so) == NULL) {
 472                         rep->r_flags |= R_MUSTRESEND;
 473                         m_freem(top);
 474                         return (0);
 475                 }
 476                 rep->r_flags &= ~R_MUSTRESEND;
 477                 soflags = rep->r_nmp->nm_soflags;
 478         } else
 479                 soflags = so->so_proto->pr_flags;
 480         if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED))
 481                 sendnam = (struct sockaddr *)0;
 482         else
 483                 sendnam = nam;
 484         if (so->so_type == SOCK_SEQPACKET)
 485                 flags = MSG_EOR;
 486         else
 487                 flags = 0;
 488
 489         error = so_pru_sosend(so, sendnam, NULL, top, NULL, flags,
 490             curthread /*XXX*/);
 491         /*
 492          * ENOBUFS for dgram sockets is transient and non fatal.
 493          * No need to log, and no need to break a soft mount.
 494          */
 495         if (error == ENOBUFS && so->so_type == SOCK_DGRAM) {
 496                 error = 0;
 497                 if (rep)                /* do backoff retransmit on client */
 498                         rep->r_flags |= R_MUSTRESEND;
 499         }
 500
 501         if (error) {
 502                 if (rep) {
 503                         log(LOG_INFO, "nfs send error %d for server %s\n",error,
 504                             rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
 505                         /*
 506                          * Deal with errors for the client side.
 507                          */
 508                         if (rep->r_flags & R_SOFTTERM)
 509                                 error = EINTR;
 510                         else
 511                                 rep->r_flags |= R_MUSTRESEND;
 512                 } else
 513                         log(LOG_INFO, "nfsd send error %d\n", error);
 514
 515                 /*
 516                  * Handle any recoverable (soft) socket errors here. (?)
 517                  */
 518                 if (error != EINTR && error != ERESTART &&
 519                         error != EWOULDBLOCK && error != EPIPE)
 520                         error = 0;
 521         }
 522         return (error);
 523 }
 524
 525 /*
 526  * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all
 527  * done by soreceive(), but for SOCK_STREAM we must deal with the Record
 528  * Mark and consolidate the data into a new mbuf list.
 529  * nb: Sometimes TCP passes the data up to soreceive() in long lists of
 530  *     small mbufs.
 531  * For SOCK_STREAM we must be very careful to read an entire record once
 532  * we have read any of it, even if the system call has been interrupted.
 533  */
 534 static int
 535 nfs_receive(struct nfsreq *rep, struct sockaddr **aname, struct mbuf **mp)
 536 {
 537         struct socket *so;
 538         struct uio auio;
 539         struct iovec aio;
 540         struct mbuf *m;
 541         struct mbuf *control;
 542         u_int32_t len;
 543         struct sockaddr **getnam;
 544         int error, sotype, rcvflg;
 545         struct thread *td = curthread;  /* XXX */
 546
 547         /*
 548          * Set up arguments for soreceive()
 549          */
 550         *mp = (struct mbuf *)0;
 551         *aname = (struct sockaddr *)0;
 552         sotype = rep->r_nmp->nm_sotype;
 553
 554         /*
 555          * For reliable protocols, lock against other senders/receivers
 556          * in case a reconnect is necessary.
 557          * For SOCK_STREAM, first get the Record Mark to find out how much
 558          * more there is to get.
 559          * We must lock the socket against other receivers
 560          * until we have an entire rpc request/reply.
 561          */
 562         if (sotype != SOCK_DGRAM) {
 563                 error = nfs_sndlock(rep);
 564                 if (error)
 565                         return (error);
 566 tryagain:
 567                 /*
 568                  * Check for fatal errors and resending request.
 569                  */
 570                 /*
 571                  * Ugh: If a reconnect attempt just happened, nm_so
 572                  * would have changed. NULL indicates a failed
 573                  * attempt that has essentially shut down this
 574                  * mount point.
 575                  */
 576                 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) {
 577                         nfs_sndunlock(rep);
 578                         return (EINTR);
 579                 }
 580                 so = rep->r_nmp->nm_so;
 581                 if (!so) {
 582                         error = nfs_reconnect(rep);
 583                         if (error) {
 584                                 nfs_sndunlock(rep);
 585                                 return (error);
 586                         }
 587                         goto tryagain;
 588                 }
 589                 while (rep->r_flags & R_MUSTRESEND) {
 590                         m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT);
 591                         nfsstats.rpcretries++;
 592                         error = nfs_send(so, rep->r_nmp->nm_nam, m, rep);
 593                         if (error) {
 594                                 if (error == EINTR || error == ERESTART ||
 595                                     (error = nfs_reconnect(rep)) != 0) {
 596                                         nfs_sndunlock(rep);
 597                                         return (error);
 598                                 }
 599                                 goto tryagain;
 600                         }
 601                 }
 602                 nfs_sndunlock(rep);
 603                 if (sotype == SOCK_STREAM) {
 604                         aio.iov_base = (caddr_t) &len;
 605                         aio.iov_len = sizeof(u_int32_t);
 606                         auio.uio_iov = &aio;
 607                         auio.uio_iovcnt = 1;
 608                         auio.uio_segflg = UIO_SYSSPACE;
 609                         auio.uio_rw = UIO_READ;
 610                         auio.uio_offset = 0;
 611                         auio.uio_resid = sizeof(u_int32_t);
 612                         auio.uio_td = td;
 613                         do {
 614                            rcvflg = MSG_WAITALL;
 615                            error = so_pru_soreceive(so, NULL, &auio, NULL,
 616                                NULL, &rcvflg);
 617                            if (error == EWOULDBLOCK && rep) {
 618                                 if (rep->r_flags & R_SOFTTERM)
 619                                         return (EINTR);
 620                            }
 621                         } while (error == EWOULDBLOCK);
 622                         if (!error && auio.uio_resid > 0) {
 623                             /*
 624                              * Don't log a 0 byte receive; it means
 625                              * that the socket has been closed, and
 626                              * can happen during normal operation
 627                              * (forcible unmount or Solaris server).
 628                              */
 629                             if (auio.uio_resid != sizeof (u_int32_t))
 630                             log(LOG_INFO,
 631                                  "short receive (%d/%d) from nfs server %s\n",
 632                                  (int)(sizeof(u_int32_t) - auio.uio_resid),
 633                                  (int)sizeof(u_int32_t),
 634                                  rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
 635                             error = EPIPE;
 636                         }
 637                         if (error)
 638                                 goto errout;
 639                         len = ntohl(len) & ~0x80000000;
 640                         /*
 641                          * This is SERIOUS! We are out of sync with the sender
 642                          * and forcing a disconnect/reconnect is all I can do.
 643                          */
 644                         if (len > NFS_MAXPACKET) {
 645                             log(LOG_ERR, "%s (%d) from nfs server %s\n",
 646                                 "impossible packet length",
 647                                 len,
 648                                 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
 649                             error = EFBIG;
 650                             goto errout;
 651                         }
 652                         auio.uio_resid = len;
 653                         do {
 654                             rcvflg = MSG_WAITALL;
 655                             error =  so_pru_soreceive(so, NULL, &auio, mp,
 656                                 NULL, &rcvflg);
 657                         } while (error == EWOULDBLOCK || error == EINTR ||
 658                                  error == ERESTART);
 659                         if (!error && auio.uio_resid > 0) {
 660                             if (len != auio.uio_resid)
 661                             log(LOG_INFO,
 662                                 "short receive (%d/%d) from nfs server %s\n",
 663                                 len - auio.uio_resid, len,
 664                                 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
 665                             error = EPIPE;
 666                         }
 667                 } else {
 668                         /*
 669                          * NB: Since uio_resid is big, MSG_WAITALL is ignored
 670                          * and soreceive() will return when it has either a
 671                          * control msg or a data msg.
 672                          * We have no use for control msg., but must grab them
 673                          * and then throw them away so we know what is going
 674                          * on.
 675                          */
 676                         auio.uio_resid = len = 100000000; /* Anything Big */
 677                         auio.uio_td = td;
 678                         do {
 679                             rcvflg = 0;
 680                             error =  so_pru_soreceive(so, NULL, &auio, mp,
 681                                 &control, &rcvflg);
 682                             if (control)
 683                                 m_freem(control);
 684                             if (error == EWOULDBLOCK && rep) {
 685                                 if (rep->r_flags & R_SOFTTERM)
 686                                         return (EINTR);
 687                             }
 688                         } while (error == EWOULDBLOCK ||
 689                                  (!error && *mp == NULL && control));
 690                         if ((rcvflg & MSG_EOR) == 0)
 691                                 printf("Egad!!\n");
 692                         if (!error && *mp == NULL)
 693                                 error = EPIPE;
 694                         len -= auio.uio_resid;
 695                 }
 696 errout:
 697                 if (error && error != EINTR && error != ERESTART) {
 698                         m_freem(*mp);
 699                         *mp = (struct mbuf *)0;
 700                         if (error != EPIPE)
 701                                 log(LOG_INFO,
 702                                     "receive error %d from nfs server %s\n",
 703                                     error,
 704                                  rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
 705                         error = nfs_sndlock(rep);
 706                         if (!error) {
 707                                 error = nfs_reconnect(rep);
 708                                 if (!error)
 709                                         goto tryagain;
 710                                 else
 711                                         nfs_sndunlock(rep);
 712                         }
 713                 }
 714         } else {
 715                 if ((so = rep->r_nmp->nm_so) == NULL)
 716                         return (EACCES);
 717                 if (so->so_state & SS_ISCONNECTED)
 718                         getnam = (struct sockaddr **)0;
 719                 else
 720                         getnam = aname;
 721                 auio.uio_resid = len = 1000000;
 722                 auio.uio_td = td;
 723                 do {
 724                         rcvflg = 0;
 725                         error =  so_pru_soreceive(so, getnam, &auio, mp, NULL,
 726                             &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         struct nfsreq *rep;
 758         struct nfsmount *nmp = myrep->r_nmp;
 759         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         struct mbuf *mrep, *m2;
 942         struct nfsreq *rep;
 943         u_int32_t *tl;
 944         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                 if (m == NULL)
1017                         return (ENOBUFS);
1018                 *mtod(m, u_int32_t *) = htonl(0x80000000 |
1019                          (m->m_pkthdr.len - NFSX_UNSIGNED));
1020         }
1021         rep->r_mreq = m;
1022         rep->r_xid = xid;
1023 tryagain:
1024         if (nmp->nm_flag & NFSMNT_SOFT)
1025                 rep->r_retry = nmp->nm_retry;
1026         else
1027                 rep->r_retry = NFS_MAXREXMIT + 1;       /* past clip limit */
1028         rep->r_rtt = rep->r_rexmit = 0;
1029         if (proct[procnum] > 0)
1030                 rep->r_flags = R_TIMING;
1031         else
1032                 rep->r_flags = 0;
1033         rep->r_mrep = NULL;
1034
1035         /*
1036          * Do the client side RPC.
1037          */
1038         nfsstats.rpcrequests++;
1039         /*
1040          * Chain request into list of outstanding requests. Be sure
1041          * to put it LAST so timer finds oldest requests first.
1042          */
1043         s = splsoftclock();
1044         TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain);
1045
1046         /* Get send time for nqnfs */
1047         reqtime = time_second;
1048
1049         /*
1050          * If backing off another request or avoiding congestion, don't
1051          * send this one now but let timer do it. If not timing a request,
1052          * do it now.
1053          */
1054         if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM ||
1055                 (nmp->nm_flag & NFSMNT_DUMBTIMR) ||
1056                 nmp->nm_sent < nmp->nm_cwnd)) {
1057                 splx(s);
1058                 if (nmp->nm_soflags & PR_CONNREQUIRED)
1059                         error = nfs_sndlock(rep);
1060                 if (!error) {
1061                         m2 = m_copym(m, 0, M_COPYALL, M_WAIT);
1062                         error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep);
1063                         if (nmp->nm_soflags & PR_CONNREQUIRED)
1064                                 nfs_sndunlock(rep);
1065                 }
1066                 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) {
1067                         nmp->nm_sent += NFS_CWNDSCALE;
1068                         rep->r_flags |= R_SENT;
1069                 }
1070         } else {
1071                 splx(s);
1072                 rep->r_rtt = -1;
1073         }
1074
1075         /*
1076          * Wait for the reply from our send or the timer's.
1077          */
1078         if (!error || error == EPIPE)
1079                 error = nfs_reply(rep);
1080
1081         /*
1082          * RPC done, unlink the request.
1083          */
1084         s = splsoftclock();
1085         TAILQ_REMOVE(&nfs_reqq, rep, r_chain);
1086         splx(s);
1087
1088         /*
1089          * Decrement the outstanding request count.
1090          */
1091         if (rep->r_flags & R_SENT) {
1092                 rep->r_flags &= ~R_SENT;        /* paranoia */
1093                 nmp->nm_sent -= NFS_CWNDSCALE;
1094         }
1095
1096         /*
1097          * If there was a successful reply and a tprintf msg.
1098          * tprintf a response.
1099          */
1100         if (!error && (rep->r_flags & R_TPRINTFMSG))
1101                 nfs_msg(rep->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname,
1102                     "is alive again");
1103         mrep = rep->r_mrep;
1104         md = rep->r_md;
1105         dpos = rep->r_dpos;
1106         if (error) {
1107                 m_freem(rep->r_mreq);
1108                 free((caddr_t)rep, M_NFSREQ);
1109                 return (error);
1110         }
1111
1112         /*
1113          * break down the rpc header and check if ok
1114          */
1115         nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1116         if (*tl++ == rpc_msgdenied) {
1117                 if (*tl == rpc_mismatch)
1118                         error = EOPNOTSUPP;
1119                 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) {
1120                         if (!failed_auth) {
1121                                 failed_auth++;
1122                                 mheadend->m_next = (struct mbuf *)0;
1123                                 m_freem(mrep);
1124                                 m_freem(rep->r_mreq);
1125                                 goto kerbauth;
1126                         } else
1127                                 error = EAUTH;
1128                 } else
1129                         error = EACCES;
1130                 m_freem(mrep);
1131                 m_freem(rep->r_mreq);
1132                 free((caddr_t)rep, M_NFSREQ);
1133                 return (error);
1134         }
1135
1136         /*
1137          * Grab any Kerberos verifier, otherwise just throw it away.
1138          */
1139         verf_type = fxdr_unsigned(int, *tl++);
1140         i = fxdr_unsigned(int32_t, *tl);
1141         if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) {
1142                 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep);
1143                 if (error)
1144                         goto nfsmout;
1145         } else if (i > 0)
1146                 nfsm_adv(nfsm_rndup(i));
1147         nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1148         /* 0 == ok */
1149         if (*tl == 0) {
1150                 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1151                 if (*tl != 0) {
1152                         error = fxdr_unsigned(int, *tl);
1153                         if ((nmp->nm_flag & NFSMNT_NFSV3) &&
1154                                 error == NFSERR_TRYLATER) {
1155                                 m_freem(mrep);
1156                                 error = 0;
1157                                 waituntil = time_second + trylater_delay;
1158                                 while (time_second < waituntil)
1159                                         (void) tsleep((caddr_t)&lbolt,
1160                                                 0, "nqnfstry", 0);
1161                                 trylater_delay *= nfs_backoff[trylater_cnt];
1162                                 if (trylater_cnt < 7)
1163                                         trylater_cnt++;
1164                                 goto tryagain;
1165                         }
1166
1167                         /*
1168                          * If the File Handle was stale, invalidate the
1169                          * lookup cache, just in case.
1170                          */
1171                         if (error == ESTALE)
1172                                 cache_purge(vp);
1173                         if (nmp->nm_flag & NFSMNT_NFSV3) {
1174                                 *mrp = mrep;
1175                                 *mdp = md;
1176                                 *dposp = dpos;
1177                                 error |= NFSERR_RETERR;
1178                         } else
1179                                 m_freem(mrep);
1180                         m_freem(rep->r_mreq);
1181                         free((caddr_t)rep, M_NFSREQ);
1182                         return (error);
1183                 }
1184
1185                 /*
1186                  * For nqnfs, get any lease in reply
1187                  */
1188                 if (nmp->nm_flag & NFSMNT_NQNFS) {
1189                         nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1190                         if (*tl) {
1191                                 np = VTONFS(vp);
1192                                 nqlflag = fxdr_unsigned(int, *tl);
1193                                 nfsm_dissect(tl, u_int32_t *, 4*NFSX_UNSIGNED);
1194                                 cachable = fxdr_unsigned(int, *tl++);
1195                                 reqtime += fxdr_unsigned(int, *tl++);
1196                                 if (reqtime > time_second) {
1197                                     frev = fxdr_hyper(tl);
1198                                     nqnfs_clientlease(nmp, np, nqlflag,
1199                                         cachable, reqtime, frev);
1200                                 }
1201                         }
1202                 }
1203                 *mrp = mrep;
1204                 *mdp = md;
1205                 *dposp = dpos;
1206                 m_freem(rep->r_mreq);
1207                 FREE((caddr_t)rep, M_NFSREQ);
1208                 return (0);
1209         }
1210         m_freem(mrep);
1211         error = EPROTONOSUPPORT;
1212 nfsmout:
1213         m_freem(rep->r_mreq);
1214         free((caddr_t)rep, M_NFSREQ);
1215         return (error);
1216 }
1217
1218 #ifndef NFS_NOSERVER
1219 /*
1220  * Generate the rpc reply header
1221  * siz arg. is used to decide if adding a cluster is worthwhile
1222  */
1223 int
1224 nfs_rephead(siz, nd, slp, err, cache, frev, mrq, mbp, bposp)
1225         int siz;
1226         struct nfsrv_descript *nd;
1227         struct nfssvc_sock *slp;
1228         int err;
1229         int cache;
1230         u_quad_t *frev;
1231         struct mbuf **mrq;
1232         struct mbuf **mbp;
1233         caddr_t *bposp;
1234 {
1235         u_int32_t *tl;
1236         struct mbuf *mreq;
1237         caddr_t bpos;
1238         struct mbuf *mb, *mb2;
1239
1240         MGETHDR(mreq, M_WAIT, MT_DATA);
1241         mb = mreq;
1242         /*
1243          * If this is a big reply, use a cluster else
1244          * try and leave leading space for the lower level headers.
1245          */
1246         siz += RPC_REPLYSIZ;
1247         if ((max_hdr + siz) >= MINCLSIZE) {
1248                 MCLGET(mreq, M_WAIT);
1249         } else
1250                 mreq->m_data += max_hdr;
1251         tl = mtod(mreq, u_int32_t *);
1252         mreq->m_len = 6 * NFSX_UNSIGNED;
1253         bpos = ((caddr_t)tl) + mreq->m_len;
1254         *tl++ = txdr_unsigned(nd->nd_retxid);
1255         *tl++ = rpc_reply;
1256         if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) {
1257                 *tl++ = rpc_msgdenied;
1258                 if (err & NFSERR_AUTHERR) {
1259                         *tl++ = rpc_autherr;
1260                         *tl = txdr_unsigned(err & ~NFSERR_AUTHERR);
1261                         mreq->m_len -= NFSX_UNSIGNED;
1262                         bpos -= NFSX_UNSIGNED;
1263                 } else {
1264                         *tl++ = rpc_mismatch;
1265                         *tl++ = txdr_unsigned(RPC_VER2);
1266                         *tl = txdr_unsigned(RPC_VER2);
1267                 }
1268         } else {
1269                 *tl++ = rpc_msgaccepted;
1270
1271                 /*
1272                  * For Kerberos authentication, we must send the nickname
1273                  * verifier back, otherwise just RPCAUTH_NULL.
1274                  */
1275                 if (nd->nd_flag & ND_KERBFULL) {
1276                     struct nfsuid *nuidp;
1277                     struct timeval ktvin, ktvout;
1278
1279                     for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first;
1280                         nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1281                         if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid &&
1282                             (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp),
1283                              &nuidp->nu_haddr, nd->nd_nam2)))
1284                             break;
1285                     }
1286                     if (nuidp) {
1287                         ktvin.tv_sec =
1288                             txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1);
1289                         ktvin.tv_usec =
1290                             txdr_unsigned(nuidp->nu_timestamp.tv_usec);
1291
1292                         /*
1293                          * Encrypt the timestamp in ecb mode using the
1294                          * session key.
1295                          */
1296 #ifdef NFSKERB
1297                         XXX
1298 #endif
1299
1300                         *tl++ = rpc_auth_kerb;
1301                         *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED);
1302                         *tl = ktvout.tv_sec;
1303                         nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1304                         *tl++ = ktvout.tv_usec;
1305                         *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid);
1306                     } else {
1307                         *tl++ = 0;
1308                         *tl++ = 0;
1309                     }
1310                 } else {
1311                         *tl++ = 0;
1312                         *tl++ = 0;
1313                 }
1314                 switch (err) {
1315                 case EPROGUNAVAIL:
1316                         *tl = txdr_unsigned(RPC_PROGUNAVAIL);
1317                         break;
1318                 case EPROGMISMATCH:
1319                         *tl = txdr_unsigned(RPC_PROGMISMATCH);
1320                         nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1321                         if (nd->nd_flag & ND_NQNFS) {
1322                                 *tl++ = txdr_unsigned(3);
1323                                 *tl = txdr_unsigned(3);
1324                         } else {
1325                                 *tl++ = txdr_unsigned(2);
1326                                 *tl = txdr_unsigned(3);
1327                         }
1328                         break;
1329                 case EPROCUNAVAIL:
1330                         *tl = txdr_unsigned(RPC_PROCUNAVAIL);
1331                         break;
1332                 case EBADRPC:
1333                         *tl = txdr_unsigned(RPC_GARBAGE);
1334                         break;
1335                 default:
1336                         *tl = 0;
1337                         if (err != NFSERR_RETVOID) {
1338                                 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
1339                                 if (err)
1340                                     *tl = txdr_unsigned(nfsrv_errmap(nd, err));
1341                                 else
1342                                     *tl = 0;
1343                         }
1344                         break;
1345                 };
1346         }
1347
1348         /*
1349          * For nqnfs, piggyback lease as requested.
1350          */
1351         if ((nd->nd_flag & ND_NQNFS) && err == 0) {
1352                 if (nd->nd_flag & ND_LEASE) {
1353                         nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
1354                         *tl++ = txdr_unsigned(nd->nd_flag & ND_LEASE);
1355                         *tl++ = txdr_unsigned(cache);
1356                         *tl++ = txdr_unsigned(nd->nd_duration);
1357                         txdr_hyper(*frev, tl);
1358                 } else {
1359                         nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
1360                         *tl = 0;
1361                 }
1362         }
1363         if (mrq != NULL)
1364             *mrq = mreq;
1365         *mbp = mb;
1366         *bposp = bpos;
1367         if (err != 0 && err != NFSERR_RETVOID)
1368                 nfsstats.srvrpc_errs++;
1369         return (0);
1370 }
1371
1372
1373 #endif /* NFS_NOSERVER */
1374 /*
1375  * Nfs timer routine
1376  * Scan the nfsreq list and retranmit any requests that have timed out
1377  * To avoid retransmission attempts on STREAM sockets (in the future) make
1378  * sure to set the r_retry field to 0 (implies nm_retry == 0).
1379  */
1380 void
1381 nfs_timer(arg)
1382         void *arg;      /* never used */
1383 {
1384         struct nfsreq *rep;
1385         struct mbuf *m;
1386         struct socket *so;
1387         struct nfsmount *nmp;
1388         int timeo;
1389         int s, error;
1390 #ifndef NFS_NOSERVER
1391         static long lasttime = 0;
1392         struct nfssvc_sock *slp;
1393         u_quad_t cur_usec;
1394 #endif /* NFS_NOSERVER */
1395         struct thread *td = &thread0; /* XXX for credentials, will break if sleep */
1396
1397         s = splnet();
1398         for (rep = nfs_reqq.tqh_first; rep != 0; rep = rep->r_chain.tqe_next) {
1399                 nmp = rep->r_nmp;
1400                 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM))
1401                         continue;
1402                 if (nfs_sigintr(nmp, rep, rep->r_td)) {
1403                         nfs_softterm(rep);
1404                         continue;
1405                 }
1406                 if (rep->r_rtt >= 0) {
1407                         rep->r_rtt++;
1408                         if (nmp->nm_flag & NFSMNT_DUMBTIMR)
1409                                 timeo = nmp->nm_timeo;
1410                         else
1411                                 timeo = NFS_RTO(nmp, proct[rep->r_procnum]);
1412                         if (nmp->nm_timeouts > 0)
1413                                 timeo *= nfs_backoff[nmp->nm_timeouts - 1];
1414                         if (rep->r_rtt <= timeo)
1415                                 continue;
1416                         if (nmp->nm_timeouts < 8)
1417                                 nmp->nm_timeouts++;
1418                 }
1419                 /*
1420                  * Check for server not responding
1421                  */
1422                 if ((rep->r_flags & R_TPRINTFMSG) == 0 &&
1423                      rep->r_rexmit > nmp->nm_deadthresh) {
1424                         nfs_msg(rep->r_td,
1425                             nmp->nm_mountp->mnt_stat.f_mntfromname,
1426                             "not responding");
1427                         rep->r_flags |= R_TPRINTFMSG;
1428                 }
1429                 if (rep->r_rexmit >= rep->r_retry) {    /* too many */
1430                         nfsstats.rpctimeouts++;
1431                         nfs_softterm(rep);
1432                         continue;
1433                 }
1434                 if (nmp->nm_sotype != SOCK_DGRAM) {
1435                         if (++rep->r_rexmit > NFS_MAXREXMIT)
1436                                 rep->r_rexmit = NFS_MAXREXMIT;
1437                         continue;
1438                 }
1439                 if ((so = nmp->nm_so) == NULL)
1440                         continue;
1441
1442                 /*
1443                  * If there is enough space and the window allows..
1444                  *      Resend it
1445                  * Set r_rtt to -1 in case we fail to send it now.
1446                  */
1447                 rep->r_rtt = -1;
1448                 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len &&
1449                    ((nmp->nm_flag & NFSMNT_DUMBTIMR) ||
1450                     (rep->r_flags & R_SENT) ||
1451                     nmp->nm_sent < nmp->nm_cwnd) &&
1452                    (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){
1453                         if ((nmp->nm_flag & NFSMNT_NOCONN) == 0)
1454                             error = so_pru_send(so, 0, m, (struct sockaddr *)0,
1455                                      (struct mbuf *)0, td);
1456                         else
1457                             error = so_pru_send(so, 0, m, nmp->nm_nam,
1458                                 (struct mbuf *)0, 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         /* td might be NULL YYY */
1579         if (td == NULL || (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         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         struct nfsreq *rep;
1646 {
1647         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         struct nfsreq *rep;
1682 {
1683         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         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         struct nfsrv_descript *nd;
1758         struct nfsd *nfsd;
1759         int has_header;
1760 {
1761         int len, i;
1762         u_int32_t *tl;
1763         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         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         struct nfssvc_sock *slp = (struct nfssvc_sock *)arg;
2033         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_pru_soreceive(so, &nam, &auio, &mp, NULL, &flags);
2067                 if (error || mp == (struct mbuf *)0) {
2068                         if (error == EWOULDBLOCK)
2069                                 slp->ns_flag |= SLP_NEEDQ;
2070                         else
2071                                 slp->ns_flag |= SLP_DISCONN;
2072                         goto dorecs;
2073                 }
2074                 m = mp;
2075                 if (slp->ns_rawend) {
2076                         slp->ns_rawend->m_next = m;
2077                         slp->ns_cc += 1000000000 - auio.uio_resid;
2078                 } else {
2079                         slp->ns_raw = m;
2080                         slp->ns_cc = 1000000000 - auio.uio_resid;
2081                 }
2082                 while (m->m_next)
2083                         m = m->m_next;
2084                 slp->ns_rawend = m;
2085
2086                 /*
2087                  * Now try and parse record(s) out of the raw stream data.
2088                  */
2089                 error = nfsrv_getstream(slp, waitflag);
2090                 if (error) {
2091                         if (error == EPERM)
2092                                 slp->ns_flag |= SLP_DISCONN;
2093                         else
2094                                 slp->ns_flag |= SLP_NEEDQ;
2095                 }
2096         } else {
2097                 do {
2098                         auio.uio_resid = 1000000000;
2099                         flags = MSG_DONTWAIT;
2100                         error = so_pru_soreceive(so, &nam, &auio, &mp, NULL,
2101                             &flags);
2102                         if (mp) {
2103                                 struct nfsrv_rec *rec;
2104                                 int mf = (waitflag & M_DONTWAIT) ?
2105                                             M_NOWAIT : M_WAITOK;
2106                                 rec = malloc(sizeof(struct nfsrv_rec),
2107                                              M_NFSRVDESC, mf);
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         struct nfssvc_sock *slp;
2147         int waitflag;
2148 {
2149         struct mbuf *m, **mpp;
2150         char *cp1, *cp2;
2151         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                 int mf = (waitflag & M_DONTWAIT) ? M_NOWAIT : M_WAITOK;
2258                 rec = malloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, mf);
2259                 if (!rec) {
2260                     m_freem(slp->ns_frag);
2261                 } else {
2262                     nfs_realign(&slp->ns_frag, 10 * NFSX_UNSIGNED);
2263                     rec->nr_address = (struct sockaddr *)0;
2264                     rec->nr_packet = slp->ns_frag;
2265                     STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link);
2266                 }
2267                 slp->ns_frag = (struct mbuf *)0;
2268             }
2269         }
2270 }
2271
2272 /*
2273  * Parse an RPC header.
2274  */
2275 int
2276 nfsrv_dorec(slp, nfsd, ndp)
2277         struct nfssvc_sock *slp;
2278         struct nfsd *nfsd;
2279         struct nfsrv_descript **ndp;
2280 {
2281         struct nfsrv_rec *rec;
2282         struct mbuf *m;
2283         struct sockaddr *nam;
2284         struct nfsrv_descript *nd;
2285         int error;
2286
2287         *ndp = NULL;
2288         if ((slp->ns_flag & SLP_VALID) == 0 || !STAILQ_FIRST(&slp->ns_rec))
2289                 return (ENOBUFS);
2290         rec = STAILQ_FIRST(&slp->ns_rec);
2291         STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
2292         nam = rec->nr_address;
2293         m = rec->nr_packet;
2294         free(rec, M_NFSRVDESC);
2295         MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript),
2296                 M_NFSRVDESC, M_WAITOK);
2297         nd->nd_md = nd->nd_mrep = m;
2298         nd->nd_nam2 = nam;
2299         nd->nd_dpos = mtod(m, caddr_t);
2300         error = nfs_getreq(nd, nfsd, TRUE);
2301         if (error) {
2302                 if (nam) {
2303                         FREE(nam, M_SONAME);
2304                 }
2305                 free((caddr_t)nd, M_NFSRVDESC);
2306                 return (error);
2307         }
2308         *ndp = nd;
2309         nfsd->nfsd_nd = nd;
2310         return (0);
2311 }
2312
2313 /*
2314  * Search for a sleeping nfsd and wake it up.
2315  * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the
2316  * running nfsds will go look for the work in the nfssvc_sock list.
2317  */
2318 void
2319 nfsrv_wakenfsd(slp)
2320         struct nfssvc_sock *slp;
2321 {
2322         struct nfsd *nd;
2323
2324         if ((slp->ns_flag & SLP_VALID) == 0)
2325                 return;
2326         for (nd = nfsd_head.tqh_first; nd != 0; nd = nd->nfsd_chain.tqe_next) {
2327                 if (nd->nfsd_flag & NFSD_WAITING) {
2328                         nd->nfsd_flag &= ~NFSD_WAITING;
2329                         if (nd->nfsd_slp)
2330                                 panic("nfsd wakeup");
2331                         slp->ns_sref++;
2332                         nd->nfsd_slp = slp;
2333                         wakeup((caddr_t)nd);
2334                         return;
2335                 }
2336         }
2337         slp->ns_flag |= SLP_DOREC;
2338         nfsd_head_flag |= NFSD_CHECKSLP;
2339 }
2340 #endif /* NFS_NOSERVER */