sys/fs/nfs/nfs_commonkrpc.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  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 /*
  38  * Socket operations for use by nfs
  39  */
  40
  41 #include "opt_kgssapi.h"
  42 #include "opt_nfs.h"
  43
  44 #include <sys/param.h>
  45 #include <sys/systm.h>
  46 #include <sys/kernel.h>
  47 #include <sys/limits.h>
  48 #include <sys/lock.h>
  49 #include <sys/malloc.h>
  50 #include <sys/mbuf.h>
  51 #include <sys/mount.h>
  52 #include <sys/mutex.h>
  53 #include <sys/proc.h>
  54 #include <sys/signalvar.h>
  55 #include <sys/syscallsubr.h>
  56 #include <sys/sysctl.h>
  57 #include <sys/syslog.h>
  58 #include <sys/vnode.h>
  59
  60 #include <rpc/rpc.h>
  61 #include <rpc/krpc.h>
  62
  63 #include <kgssapi/krb5/kcrypto.h>
  64
  65 #include <fs/nfs/nfsport.h>
  66
  67 #ifdef KDTRACE_HOOKS
  68 #include <sys/dtrace_bsd.h>
  69
  70 dtrace_nfsclient_nfs23_start_probe_func_t
  71                 dtrace_nfscl_nfs234_start_probe;
  72
  73 dtrace_nfsclient_nfs23_done_probe_func_t
  74                 dtrace_nfscl_nfs234_done_probe;
  75
  76 /*
  77  * Registered probes by RPC type.
  78  */
  79 uint32_t        nfscl_nfs2_start_probes[NFSV41_NPROCS + 1];
  80 uint32_t        nfscl_nfs2_done_probes[NFSV41_NPROCS + 1];
  81
  82 uint32_t        nfscl_nfs3_start_probes[NFSV41_NPROCS + 1];
  83 uint32_t        nfscl_nfs3_done_probes[NFSV41_NPROCS + 1];
  84
  85 uint32_t        nfscl_nfs4_start_probes[NFSV41_NPROCS + 1];
  86 uint32_t        nfscl_nfs4_done_probes[NFSV41_NPROCS + 1];
  87 #endif
  88
  89 NFSSTATESPINLOCK;
  90 NFSREQSPINLOCK;
  91 NFSDLOCKMUTEX;
  92 NFSCLSTATEMUTEX;
  93 extern struct nfsstatsv1 nfsstatsv1;
  94 extern struct nfsreqhead nfsd_reqq;
  95 extern int nfscl_ticks;
  96 extern void (*ncl_call_invalcaches)(struct vnode *);
  97 extern int nfs_numnfscbd;
  98 extern int nfscl_debuglevel;
  99
 100 SVCPOOL         *nfscbd_pool;
 101 static int      nfsrv_gsscallbackson = 0;
 102 static int      nfs_bufpackets = 4;
 103 static int      nfs_reconnects;
 104 static int      nfs3_jukebox_delay = 10;
 105 static int      nfs_skip_wcc_data_onerr = 1;
 106
 107 SYSCTL_DECL(_vfs_nfs);
 108
 109 SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0,
 110     "Buffer reservation size 2 < x < 64");
 111 SYSCTL_INT(_vfs_nfs, OID_AUTO, reconnects, CTLFLAG_RD, &nfs_reconnects, 0,
 112     "Number of times the nfs client has had to reconnect");
 113 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs3_jukebox_delay, CTLFLAG_RW, &nfs3_jukebox_delay, 0,
 114     "Number of seconds to delay a retry after receiving EJUKEBOX");
 115 SYSCTL_INT(_vfs_nfs, OID_AUTO, skip_wcc_data_onerr, CTLFLAG_RW, &nfs_skip_wcc_data_onerr, 0,
 116     "Disable weak cache consistency checking when server returns an error");
 117
 118 static void     nfs_down(struct nfsmount *, struct thread *, const char *,
 119     int, int);
 120 static void     nfs_up(struct nfsmount *, struct thread *, const char *,
 121     int, int);
 122 static int      nfs_msg(struct thread *, const char *, const char *, int);
 123
 124 struct nfs_cached_auth {
 125         int             ca_refs; /* refcount, including 1 from the cache */
 126         uid_t           ca_uid;  /* uid that corresponds to this auth */
 127         AUTH            *ca_auth; /* RPC auth handle */
 128 };
 129
 130 static int nfsv2_procid[NFS_V3NPROCS] = {
 131         NFSV2PROC_NULL,
 132         NFSV2PROC_GETATTR,
 133         NFSV2PROC_SETATTR,
 134         NFSV2PROC_LOOKUP,
 135         NFSV2PROC_NOOP,
 136         NFSV2PROC_READLINK,
 137         NFSV2PROC_READ,
 138         NFSV2PROC_WRITE,
 139         NFSV2PROC_CREATE,
 140         NFSV2PROC_MKDIR,
 141         NFSV2PROC_SYMLINK,
 142         NFSV2PROC_CREATE,
 143         NFSV2PROC_REMOVE,
 144         NFSV2PROC_RMDIR,
 145         NFSV2PROC_RENAME,
 146         NFSV2PROC_LINK,
 147         NFSV2PROC_READDIR,
 148         NFSV2PROC_NOOP,
 149         NFSV2PROC_STATFS,
 150         NFSV2PROC_NOOP,
 151         NFSV2PROC_NOOP,
 152         NFSV2PROC_NOOP,
 153 };
 154
 155 /*
 156  * Initialize sockets and congestion for a new NFS connection.
 157  * We do not free the sockaddr if error.
 158  */
 159 int
 160 newnfs_connect(struct nfsmount *nmp, struct nfssockreq *nrp,
 161     struct ucred *cred, NFSPROC_T *p, int callback_retry_mult)
 162 {
 163         int rcvreserve, sndreserve;
 164         int pktscale;
 165         struct sockaddr *saddr;
 166         struct ucred *origcred;
 167         CLIENT *client;
 168         struct netconfig *nconf;
 169         struct socket *so;
 170         int one = 1, retries, error = 0;
 171         struct thread *td = curthread;
 172         SVCXPRT *xprt;
 173         struct timeval timo;
 174
 175         /*
 176          * We need to establish the socket using the credentials of
 177          * the mountpoint.  Some parts of this process (such as
 178          * sobind() and soconnect()) will use the curent thread's
 179          * credential instead of the socket credential.  To work
 180          * around this, temporarily change the current thread's
 181          * credential to that of the mountpoint.
 182          *
 183          * XXX: It would be better to explicitly pass the correct
 184          * credential to sobind() and soconnect().
 185          */
 186         origcred = td->td_ucred;
 187
 188         /*
 189          * Use the credential in nr_cred, if not NULL.
 190          */
 191         if (nrp->nr_cred != NULL)
 192                 td->td_ucred = nrp->nr_cred;
 193         else
 194                 td->td_ucred = cred;
 195         saddr = nrp->nr_nam;
 196
 197         if (saddr->sa_family == AF_INET)
 198                 if (nrp->nr_sotype == SOCK_DGRAM)
 199                         nconf = getnetconfigent("udp");
 200                 else
 201                         nconf = getnetconfigent("tcp");
 202         else
 203                 if (nrp->nr_sotype == SOCK_DGRAM)
 204                         nconf = getnetconfigent("udp6");
 205                 else
 206                         nconf = getnetconfigent("tcp6");
 207
 208         pktscale = nfs_bufpackets;
 209         if (pktscale < 2)
 210                 pktscale = 2;
 211         if (pktscale > 64)
 212                 pktscale = 64;
 213         /*
 214          * soreserve() can fail if sb_max is too small, so shrink pktscale
 215          * and try again if there is an error.
 216          * Print a log message suggesting increasing sb_max.
 217          * Creating a socket and doing this is necessary since, if the
 218          * reservation sizes are too large and will make soreserve() fail,
 219          * the connection will work until a large send is attempted and
 220          * then it will loop in the krpc code.
 221          */
 222         so = NULL;
 223         saddr = NFSSOCKADDR(nrp->nr_nam, struct sockaddr *);
 224         error = socreate(saddr->sa_family, &so, nrp->nr_sotype,
 225             nrp->nr_soproto, td->td_ucred, td);
 226         if (error) {
 227                 td->td_ucred = origcred;
 228                 goto out;
 229         }
 230         do {
 231             if (error != 0 && pktscale > 2)
 232                 pktscale--;
 233             if (nrp->nr_sotype == SOCK_DGRAM) {
 234                 if (nmp != NULL) {
 235                         sndreserve = (NFS_MAXDGRAMDATA + NFS_MAXPKTHDR) *
 236                             pktscale;
 237                         rcvreserve = (NFS_MAXDGRAMDATA + NFS_MAXPKTHDR) *
 238                             pktscale;
 239                 } else {
 240                         sndreserve = rcvreserve = 1024 * pktscale;
 241                 }
 242             } else {
 243                 if (nrp->nr_sotype != SOCK_STREAM)
 244                         panic("nfscon sotype");
 245                 if (nmp != NULL) {
 246                         sndreserve = (NFS_MAXBSIZE + NFS_MAXPKTHDR +
 247                             sizeof (u_int32_t)) * pktscale;
 248                         rcvreserve = (NFS_MAXBSIZE + NFS_MAXPKTHDR +
 249                             sizeof (u_int32_t)) * pktscale;
 250                 } else {
 251                         sndreserve = rcvreserve = 1024 * pktscale;
 252                 }
 253             }
 254             error = soreserve(so, sndreserve, rcvreserve);
 255         } while (error != 0 && pktscale > 2);
 256         soclose(so);
 257         if (error) {
 258                 td->td_ucred = origcred;
 259                 goto out;
 260         }
 261
 262         client = clnt_reconnect_create(nconf, saddr, nrp->nr_prog,
 263             nrp->nr_vers, sndreserve, rcvreserve);
 264         CLNT_CONTROL(client, CLSET_WAITCHAN, "nfsreq");
 265         if (nmp != NULL) {
 266                 if ((nmp->nm_flag & NFSMNT_INT))
 267                         CLNT_CONTROL(client, CLSET_INTERRUPTIBLE, &one);
 268                 if ((nmp->nm_flag & NFSMNT_RESVPORT))
 269                         CLNT_CONTROL(client, CLSET_PRIVPORT, &one);
 270                 if (NFSHASSOFT(nmp)) {
 271                         if (nmp->nm_sotype == SOCK_DGRAM)
 272                                 /*
 273                                  * For UDP, the large timeout for a reconnect
 274                                  * will be set to "nm_retry * nm_timeo / 2", so
 275                                  * we only want to do 2 reconnect timeout
 276                                  * retries.
 277                                  */
 278                                 retries = 2;
 279                         else
 280                                 retries = nmp->nm_retry;
 281                 } else
 282                         retries = INT_MAX;
 283                 if (NFSHASNFSV4N(nmp)) {
 284                         /*
 285                          * Make sure the nfscbd_pool doesn't get destroyed
 286                          * while doing this.
 287                          */
 288                         NFSD_LOCK();
 289                         if (nfs_numnfscbd > 0) {
 290                                 nfs_numnfscbd++;
 291                                 NFSD_UNLOCK();
 292                                 xprt = svc_vc_create_backchannel(nfscbd_pool);
 293                                 CLNT_CONTROL(client, CLSET_BACKCHANNEL, xprt);
 294                                 NFSD_LOCK();
 295                                 nfs_numnfscbd--;
 296                                 if (nfs_numnfscbd == 0)
 297                                         wakeup(&nfs_numnfscbd);
 298                         }
 299                         NFSD_UNLOCK();
 300                 }
 301         } else {
 302                 /*
 303                  * Three cases:
 304                  * - Null RPC callback to client
 305                  * - Non-Null RPC callback to client, wait a little longer
 306                  * - upcalls to nfsuserd and gssd (clp == NULL)
 307                  */
 308                 if (callback_retry_mult == 0) {
 309                         retries = NFSV4_UPCALLRETRY;
 310                         CLNT_CONTROL(client, CLSET_PRIVPORT, &one);
 311                 } else {
 312                         retries = NFSV4_CALLBACKRETRY * callback_retry_mult;
 313                 }
 314         }
 315         CLNT_CONTROL(client, CLSET_RETRIES, &retries);
 316
 317         if (nmp != NULL) {
 318                 /*
 319                  * For UDP, there are 2 timeouts:
 320                  * - CLSET_RETRY_TIMEOUT sets the initial timeout for the timer
 321                  *   that does a retransmit of an RPC request using the same
 322                  *   socket and xid. This is what you normally want to do,
 323                  *   since NFS servers depend on "same xid" for their
 324                  *   Duplicate Request Cache.
 325                  * - timeout specified in CLNT_CALL_MBUF(), which specifies when
 326                  *   retransmits on the same socket should fail and a fresh
 327                  *   socket created. Each of these timeouts counts as one
 328                  *   CLSET_RETRIES as set above.
 329                  * Set the initial retransmit timeout for UDP. This timeout
 330                  * doesn't exist for TCP and the following call just fails,
 331                  * which is ok.
 332                  */
 333                 timo.tv_sec = nmp->nm_timeo / NFS_HZ;
 334                 timo.tv_usec = (nmp->nm_timeo % NFS_HZ) * 1000000 / NFS_HZ;
 335                 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, &timo);
 336         }
 337
 338         mtx_lock(&nrp->nr_mtx);
 339         if (nrp->nr_client != NULL) {
 340                 mtx_unlock(&nrp->nr_mtx);
 341                 /*
 342                  * Someone else already connected.
 343                  */
 344                 CLNT_RELEASE(client);
 345         } else {
 346                 nrp->nr_client = client;
 347                 /*
 348                  * Protocols that do not require connections may be optionally
 349                  * left unconnected for servers that reply from a port other
 350                  * than NFS_PORT.
 351                  */
 352                 if (nmp == NULL || (nmp->nm_flag & NFSMNT_NOCONN) == 0) {
 353                         mtx_unlock(&nrp->nr_mtx);
 354                         CLNT_CONTROL(client, CLSET_CONNECT, &one);
 355                 } else
 356                         mtx_unlock(&nrp->nr_mtx);
 357         }
 358
 359
 360         /* Restore current thread's credentials. */
 361         td->td_ucred = origcred;
 362
 363 out:
 364         NFSEXITCODE(error);
 365         return (error);
 366 }
 367
 368 /*
 369  * NFS disconnect. Clean up and unlink.
 370  */
 371 void
 372 newnfs_disconnect(struct nfssockreq *nrp)
 373 {
 374         CLIENT *client;
 375
 376         mtx_lock(&nrp->nr_mtx);
 377         if (nrp->nr_client != NULL) {
 378                 client = nrp->nr_client;
 379                 nrp->nr_client = NULL;
 380                 mtx_unlock(&nrp->nr_mtx);
 381                 rpc_gss_secpurge_call(client);
 382                 CLNT_CLOSE(client);
 383                 CLNT_RELEASE(client);
 384         } else {
 385                 mtx_unlock(&nrp->nr_mtx);
 386         }
 387 }
 388
 389 static AUTH *
 390 nfs_getauth(struct nfssockreq *nrp, int secflavour, char *clnt_principal,
 391     char *srv_principal, gss_OID mech_oid, struct ucred *cred)
 392 {
 393         rpc_gss_service_t svc;
 394         AUTH *auth;
 395
 396         switch (secflavour) {
 397         case RPCSEC_GSS_KRB5:
 398         case RPCSEC_GSS_KRB5I:
 399         case RPCSEC_GSS_KRB5P:
 400                 if (!mech_oid) {
 401                         if (!rpc_gss_mech_to_oid_call("kerberosv5", &mech_oid))
 402                                 return (NULL);
 403                 }
 404                 if (secflavour == RPCSEC_GSS_KRB5)
 405                         svc = rpc_gss_svc_none;
 406                 else if (secflavour == RPCSEC_GSS_KRB5I)
 407                         svc = rpc_gss_svc_integrity;
 408                 else
 409                         svc = rpc_gss_svc_privacy;
 410
 411                 if (clnt_principal == NULL)
 412                         auth = rpc_gss_secfind_call(nrp->nr_client, cred,
 413                             srv_principal, mech_oid, svc);
 414                 else {
 415                         auth = rpc_gss_seccreate_call(nrp->nr_client, cred,
 416                             clnt_principal, srv_principal, "kerberosv5",
 417                             svc, NULL, NULL, NULL);
 418                         return (auth);
 419                 }
 420                 if (auth != NULL)
 421                         return (auth);
 422                 /* fallthrough */
 423         case AUTH_SYS:
 424         default:
 425                 return (authunix_create(cred));
 426
 427         }
 428 }
 429
 430 /*
 431  * Callback from the RPC code to generate up/down notifications.
 432  */
 433
 434 struct nfs_feedback_arg {
 435         struct nfsmount *nf_mount;
 436         int             nf_lastmsg;     /* last tprintf */
 437         int             nf_tprintfmsg;
 438         struct thread   *nf_td;
 439 };
 440
 441 static void
 442 nfs_feedback(int type, int proc, void *arg)
 443 {
 444         struct nfs_feedback_arg *nf = (struct nfs_feedback_arg *) arg;
 445         struct nfsmount *nmp = nf->nf_mount;
 446         time_t now;
 447
 448         switch (type) {
 449         case FEEDBACK_REXMIT2:
 450         case FEEDBACK_RECONNECT:
 451                 now = NFSD_MONOSEC;
 452                 if (nf->nf_lastmsg + nmp->nm_tprintf_delay < now) {
 453                         nfs_down(nmp, nf->nf_td,
 454                             "not responding", 0, NFSSTA_TIMEO);
 455                         nf->nf_tprintfmsg = TRUE;
 456                         nf->nf_lastmsg = now;
 457                 }
 458                 break;
 459
 460         case FEEDBACK_OK:
 461                 nfs_up(nf->nf_mount, nf->nf_td,
 462                     "is alive again", NFSSTA_TIMEO, nf->nf_tprintfmsg);
 463                 break;
 464         }
 465 }
 466
 467 /*
 468  * newnfs_request - goes something like this
 469  *      - does the rpc by calling the krpc layer
 470  *      - break down rpc header and return with nfs reply
 471  * nb: always frees up nd_mreq mbuf list
 472  */
 473 int
 474 newnfs_request(struct nfsrv_descript *nd, struct nfsmount *nmp,
 475     struct nfsclient *clp, struct nfssockreq *nrp, vnode_t vp,
 476     struct thread *td, struct ucred *cred, u_int32_t prog, u_int32_t vers,
 477     u_char *retsum, int toplevel, u_int64_t *xidp, struct nfsclsession *dssep)
 478 {
 479         uint32_t retseq, retval, slotseq, *tl;
 480         time_t waituntil;
 481         int i = 0, j = 0, opcnt, set_sigset = 0, slot;
 482         int trycnt, error = 0, usegssname = 0, secflavour = AUTH_SYS;
 483         int freeslot, maxslot, reterr, slotpos, timeo;
 484         u_int16_t procnum;
 485         u_int trylater_delay = 1;
 486         struct nfs_feedback_arg nf;
 487         struct timeval timo;
 488         AUTH *auth;
 489         struct rpc_callextra ext;
 490         enum clnt_stat stat;
 491         struct nfsreq *rep = NULL;
 492         char *srv_principal = NULL, *clnt_principal = NULL;
 493         sigset_t oldset;
 494         struct ucred *authcred;
 495         struct nfsclsession *sep;
 496         uint8_t sessionid[NFSX_V4SESSIONID];
 497
 498         sep = dssep;
 499         if (xidp != NULL)
 500                 *xidp = 0;
 501         /* Reject requests while attempting a forced unmount. */
 502         if (nmp != NULL && (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF)) {
 503                 m_freem(nd->nd_mreq);
 504                 return (ESTALE);
 505         }
 506
 507         /*
 508          * Set authcred, which is used to acquire RPC credentials to
 509          * the cred argument, by default. The crhold() should not be
 510          * necessary, but will ensure that some future code change
 511          * doesn't result in the credential being free'd prematurely.
 512          */
 513         authcred = crhold(cred);
 514
 515         /* For client side interruptible mounts, mask off the signals. */
 516         if (nmp != NULL && td != NULL && NFSHASINT(nmp)) {
 517                 newnfs_set_sigmask(td, &oldset);
 518                 set_sigset = 1;
 519         }
 520
 521         /*
 522          * XXX if not already connected call nfs_connect now. Longer
 523          * term, change nfs_mount to call nfs_connect unconditionally
 524          * and let clnt_reconnect_create handle reconnects.
 525          */
 526         if (nrp->nr_client == NULL)
 527                 newnfs_connect(nmp, nrp, cred, td, 0);
 528
 529         /*
 530          * For a client side mount, nmp is != NULL and clp == NULL. For
 531          * server calls (callbacks or upcalls), nmp == NULL.
 532          */
 533         if (clp != NULL) {
 534                 NFSLOCKSTATE();
 535                 if ((clp->lc_flags & LCL_GSS) && nfsrv_gsscallbackson) {
 536                         secflavour = RPCSEC_GSS_KRB5;
 537                         if (nd->nd_procnum != NFSPROC_NULL) {
 538                                 if (clp->lc_flags & LCL_GSSINTEGRITY)
 539                                         secflavour = RPCSEC_GSS_KRB5I;
 540                                 else if (clp->lc_flags & LCL_GSSPRIVACY)
 541                                         secflavour = RPCSEC_GSS_KRB5P;
 542                         }
 543                 }
 544                 NFSUNLOCKSTATE();
 545         } else if (nmp != NULL && NFSHASKERB(nmp) &&
 546              nd->nd_procnum != NFSPROC_NULL) {
 547                 if (NFSHASALLGSSNAME(nmp) && nmp->nm_krbnamelen > 0)
 548                         nd->nd_flag |= ND_USEGSSNAME;
 549                 if ((nd->nd_flag & ND_USEGSSNAME) != 0) {
 550                         /*
 551                          * If there is a client side host based credential,
 552                          * use that, otherwise use the system uid, if set.
 553                          * The system uid is in the nmp->nm_sockreq.nr_cred
 554                          * credentials.
 555                          */
 556                         if (nmp->nm_krbnamelen > 0) {
 557                                 usegssname = 1;
 558                                 clnt_principal = nmp->nm_krbname;
 559                         } else if (nmp->nm_uid != (uid_t)-1) {
 560                                 KASSERT(nmp->nm_sockreq.nr_cred != NULL,
 561                                     ("newnfs_request: NULL nr_cred"));
 562                                 crfree(authcred);
 563                                 authcred = crhold(nmp->nm_sockreq.nr_cred);
 564                         }
 565                 } else if (nmp->nm_krbnamelen == 0 &&
 566                     nmp->nm_uid != (uid_t)-1 && cred->cr_uid == (uid_t)0) {
 567                         /*
 568                          * If there is no host based principal name and
 569                          * the system uid is set and this is root, use the
 570                          * system uid, since root won't have user
 571                          * credentials in a credentials cache file.
 572                          * The system uid is in the nmp->nm_sockreq.nr_cred
 573                          * credentials.
 574                          */
 575                         KASSERT(nmp->nm_sockreq.nr_cred != NULL,
 576                             ("newnfs_request: NULL nr_cred"));
 577                         crfree(authcred);
 578                         authcred = crhold(nmp->nm_sockreq.nr_cred);
 579                 }
 580                 if (NFSHASINTEGRITY(nmp))
 581                         secflavour = RPCSEC_GSS_KRB5I;
 582                 else if (NFSHASPRIVACY(nmp))
 583                         secflavour = RPCSEC_GSS_KRB5P;
 584                 else
 585                         secflavour = RPCSEC_GSS_KRB5;
 586                 srv_principal = NFSMNT_SRVKRBNAME(nmp);
 587         } else if (nmp != NULL && !NFSHASKERB(nmp) &&
 588             nd->nd_procnum != NFSPROC_NULL &&
 589             (nd->nd_flag & ND_USEGSSNAME) != 0) {
 590                 /*
 591                  * Use the uid that did the mount when the RPC is doing
 592                  * NFSv4 system operations, as indicated by the
 593                  * ND_USEGSSNAME flag, for the AUTH_SYS case.
 594                  * The credentials in nm_sockreq.nr_cred were used for the
 595                  * mount.
 596                  */
 597                 KASSERT(nmp->nm_sockreq.nr_cred != NULL,
 598                     ("newnfs_request: NULL nr_cred"));
 599                 crfree(authcred);
 600                 authcred = crhold(nmp->nm_sockreq.nr_cred);
 601         }
 602
 603         if (nmp != NULL) {
 604                 bzero(&nf, sizeof(struct nfs_feedback_arg));
 605                 nf.nf_mount = nmp;
 606                 nf.nf_td = td;
 607                 nf.nf_lastmsg = NFSD_MONOSEC -
 608                     ((nmp->nm_tprintf_delay)-(nmp->nm_tprintf_initial_delay));
 609         }
 610
 611         if (nd->nd_procnum == NFSPROC_NULL)
 612                 auth = authnone_create();
 613         else if (usegssname) {
 614                 /*
 615                  * For this case, the authenticator is held in the
 616                  * nfssockreq structure, so don't release the reference count
 617                  * held on it. --> Don't AUTH_DESTROY() it in this function.
 618                  */
 619                 if (nrp->nr_auth == NULL)
 620                         nrp->nr_auth = nfs_getauth(nrp, secflavour,
 621                             clnt_principal, srv_principal, NULL, authcred);
 622                 else
 623                         rpc_gss_refresh_auth_call(nrp->nr_auth);
 624                 auth = nrp->nr_auth;
 625         } else
 626                 auth = nfs_getauth(nrp, secflavour, NULL,
 627                     srv_principal, NULL, authcred);
 628         crfree(authcred);
 629         if (auth == NULL) {
 630                 m_freem(nd->nd_mreq);
 631                 if (set_sigset)
 632                         newnfs_restore_sigmask(td, &oldset);
 633                 return (EACCES);
 634         }
 635         bzero(&ext, sizeof(ext));
 636         ext.rc_auth = auth;
 637         if (nmp != NULL) {
 638                 ext.rc_feedback = nfs_feedback;
 639                 ext.rc_feedback_arg = &nf;
 640         }
 641
 642         procnum = nd->nd_procnum;
 643         if ((nd->nd_flag & ND_NFSV4) &&
 644             nd->nd_procnum != NFSPROC_NULL &&
 645             nd->nd_procnum != NFSV4PROC_CBCOMPOUND)
 646                 procnum = NFSV4PROC_COMPOUND;
 647
 648         if (nmp != NULL) {
 649                 NFSINCRGLOBAL(nfsstatsv1.rpcrequests);
 650
 651                 /* Map the procnum to the old NFSv2 one, as required. */
 652                 if ((nd->nd_flag & ND_NFSV2) != 0) {
 653                         if (nd->nd_procnum < NFS_V3NPROCS)
 654                                 procnum = nfsv2_procid[nd->nd_procnum];
 655                         else
 656                                 procnum = NFSV2PROC_NOOP;
 657                 }
 658
 659                 /*
 660                  * Now only used for the R_DONTRECOVER case, but until that is
 661                  * supported within the krpc code, I need to keep a queue of
 662                  * outstanding RPCs for nfsv4 client requests.
 663                  */
 664                 if ((nd->nd_flag & ND_NFSV4) && procnum == NFSV4PROC_COMPOUND)
 665                         MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq),
 666                             M_NFSDREQ, M_WAITOK);
 667 #ifdef KDTRACE_HOOKS
 668                 if (dtrace_nfscl_nfs234_start_probe != NULL) {
 669                         uint32_t probe_id;
 670                         int probe_procnum;
 671
 672                         if (nd->nd_flag & ND_NFSV4) {
 673                                 probe_id =
 674                                     nfscl_nfs4_start_probes[nd->nd_procnum];
 675                                 probe_procnum = nd->nd_procnum;
 676                         } else if (nd->nd_flag & ND_NFSV3) {
 677                                 probe_id = nfscl_nfs3_start_probes[procnum];
 678                                 probe_procnum = procnum;
 679                         } else {
 680                                 probe_id =
 681                                     nfscl_nfs2_start_probes[nd->nd_procnum];
 682                                 probe_procnum = procnum;
 683                         }
 684                         if (probe_id != 0)
 685                                 (dtrace_nfscl_nfs234_start_probe)
 686                                     (probe_id, vp, nd->nd_mreq, cred,
 687                                      probe_procnum);
 688                 }
 689 #endif
 690         }
 691         trycnt = 0;
 692         freeslot = -1;          /* Set to slot that needs to be free'd */
 693 tryagain:
 694         slot = -1;              /* Slot that needs a sequence# increment. */
 695         /*
 696          * This timeout specifies when a new socket should be created,
 697          * along with new xid values. For UDP, this should be done
 698          * infrequently, since retransmits of RPC requests should normally
 699          * use the same xid.
 700          */
 701         if (nmp == NULL) {
 702                 timo.tv_usec = 0;
 703                 if (clp == NULL)
 704                         timo.tv_sec = NFSV4_UPCALLTIMEO;
 705                 else
 706                         timo.tv_sec = NFSV4_CALLBACKTIMEO;
 707         } else {
 708                 if (nrp->nr_sotype != SOCK_DGRAM) {
 709                         timo.tv_usec = 0;
 710                         if ((nmp->nm_flag & NFSMNT_NFSV4))
 711                                 timo.tv_sec = INT_MAX;
 712                         else
 713                                 timo.tv_sec = NFS_TCPTIMEO;
 714                 } else {
 715                         if (NFSHASSOFT(nmp)) {
 716                                 /*
 717                                  * CLSET_RETRIES is set to 2, so this should be
 718                                  * half of the total timeout required.
 719                                  */
 720                                 timeo = nmp->nm_retry * nmp->nm_timeo / 2;
 721                                 if (timeo < 1)
 722                                         timeo = 1;
 723                                 timo.tv_sec = timeo / NFS_HZ;
 724                                 timo.tv_usec = (timeo % NFS_HZ) * 1000000 /
 725                                     NFS_HZ;
 726                         } else {
 727                                 /* For UDP hard mounts, use a large value. */
 728                                 timo.tv_sec = NFS_MAXTIMEO / NFS_HZ;
 729                                 timo.tv_usec = 0;
 730                         }
 731                 }
 732
 733                 if (rep != NULL) {
 734                         rep->r_flags = 0;
 735                         rep->r_nmp = nmp;
 736                         /*
 737                          * Chain request into list of outstanding requests.
 738                          */
 739                         NFSLOCKREQ();
 740                         TAILQ_INSERT_TAIL(&nfsd_reqq, rep, r_chain);
 741                         NFSUNLOCKREQ();
 742                 }
 743         }
 744
 745         nd->nd_mrep = NULL;
 746         if (clp != NULL && sep != NULL)
 747                 stat = clnt_bck_call(nrp->nr_client, &ext, procnum,
 748                     nd->nd_mreq, &nd->nd_mrep, timo, sep->nfsess_xprt);
 749         else
 750                 stat = CLNT_CALL_MBUF(nrp->nr_client, &ext, procnum,
 751                     nd->nd_mreq, &nd->nd_mrep, timo);
 752
 753         if (rep != NULL) {
 754                 /*
 755                  * RPC done, unlink the request.
 756                  */
 757                 NFSLOCKREQ();
 758                 TAILQ_REMOVE(&nfsd_reqq, rep, r_chain);
 759                 NFSUNLOCKREQ();
 760         }
 761
 762         /*
 763          * If there was a successful reply and a tprintf msg.
 764          * tprintf a response.
 765          */
 766         if (stat == RPC_SUCCESS) {
 767                 error = 0;
 768         } else if (stat == RPC_TIMEDOUT) {
 769                 NFSINCRGLOBAL(nfsstatsv1.rpctimeouts);
 770                 error = ETIMEDOUT;
 771         } else if (stat == RPC_VERSMISMATCH) {
 772                 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
 773                 error = EOPNOTSUPP;
 774         } else if (stat == RPC_PROGVERSMISMATCH) {
 775                 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
 776                 error = EPROTONOSUPPORT;
 777         } else if (stat == RPC_INTR) {
 778                 error = EINTR;
 779         } else {
 780                 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
 781                 error = EACCES;
 782         }
 783         if (error) {
 784                 m_freem(nd->nd_mreq);
 785                 if (usegssname == 0)
 786                         AUTH_DESTROY(auth);
 787                 if (rep != NULL)
 788                         FREE((caddr_t)rep, M_NFSDREQ);
 789                 if (set_sigset)
 790                         newnfs_restore_sigmask(td, &oldset);
 791                 return (error);
 792         }
 793
 794         KASSERT(nd->nd_mrep != NULL, ("mrep shouldn't be NULL if no error\n"));
 795
 796         /*
 797          * Search for any mbufs that are not a multiple of 4 bytes long
 798          * or with m_data not longword aligned.
 799          * These could cause pointer alignment problems, so copy them to
 800          * well aligned mbufs.
 801          */
 802         newnfs_realign(&nd->nd_mrep, M_WAITOK);
 803         nd->nd_md = nd->nd_mrep;
 804         nd->nd_dpos = NFSMTOD(nd->nd_md, caddr_t);
 805         nd->nd_repstat = 0;
 806         if (nd->nd_procnum != NFSPROC_NULL &&
 807             nd->nd_procnum != NFSV4PROC_CBNULL) {
 808                 /* If sep == NULL, set it to the default in nmp. */
 809                 if (sep == NULL && nmp != NULL)
 810                         sep = nfsmnt_mdssession(nmp);
 811                 /*
 812                  * and now the actual NFS xdr.
 813                  */
 814                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 815                 nd->nd_repstat = fxdr_unsigned(u_int32_t, *tl);
 816                 if (nd->nd_repstat >= 10000)
 817                         NFSCL_DEBUG(1, "proc=%d reps=%d\n", (int)nd->nd_procnum,
 818                             (int)nd->nd_repstat);
 819
 820                 /*
 821                  * Get rid of the tag, return count and SEQUENCE result for
 822                  * NFSv4.
 823                  */
 824                 if ((nd->nd_flag & ND_NFSV4) != 0) {
 825                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 826                         i = fxdr_unsigned(int, *tl);
 827                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
 828                         if (error)
 829                                 goto nfsmout;
 830                         NFSM_DISSECT(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 831                         opcnt = fxdr_unsigned(int, *tl++);
 832                         i = fxdr_unsigned(int, *tl++);
 833                         j = fxdr_unsigned(int, *tl);
 834                         if (j >= 10000)
 835                                 NFSCL_DEBUG(1, "fop=%d fst=%d\n", i, j);
 836                         /*
 837                          * If the first op is Sequence, free up the slot.
 838                          */
 839                         if ((nmp != NULL && i == NFSV4OP_SEQUENCE && j != 0) ||
 840                             (clp != NULL && i == NFSV4OP_CBSEQUENCE && j != 0))
 841                                 NFSCL_DEBUG(1, "failed seq=%d\n", j);
 842                         if ((nmp != NULL && i == NFSV4OP_SEQUENCE && j == 0) ||
 843                             (clp != NULL && i == NFSV4OP_CBSEQUENCE && j == 0)
 844                             ) {
 845                                 if (i == NFSV4OP_SEQUENCE)
 846                                         NFSM_DISSECT(tl, uint32_t *,
 847                                             NFSX_V4SESSIONID +
 848                                             5 * NFSX_UNSIGNED);
 849                                 else
 850                                         NFSM_DISSECT(tl, uint32_t *,
 851                                             NFSX_V4SESSIONID +
 852                                             4 * NFSX_UNSIGNED);
 853                                 mtx_lock(&sep->nfsess_mtx);
 854                                 if (bcmp(tl, sep->nfsess_sessionid,
 855                                     NFSX_V4SESSIONID) == 0) {
 856                                         tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
 857                                         retseq = fxdr_unsigned(uint32_t, *tl++);
 858                                         slot = fxdr_unsigned(int, *tl++);
 859                                         freeslot = slot;
 860                                         if (retseq != sep->nfsess_slotseq[slot])
 861                                                 printf("retseq diff 0x%x\n",
 862                                                     retseq);
 863                                         retval = fxdr_unsigned(uint32_t, *++tl);
 864                                         if ((retval + 1) < sep->nfsess_foreslots
 865                                             )
 866                                                 sep->nfsess_foreslots = (retval
 867                                                     + 1);
 868                                         else if ((retval + 1) >
 869                                             sep->nfsess_foreslots)
 870                                                 sep->nfsess_foreslots = (retval
 871                                                     < 64) ? (retval + 1) : 64;
 872                                 }
 873                                 mtx_unlock(&sep->nfsess_mtx);
 874
 875                                 /* Grab the op and status for the next one. */
 876                                 if (opcnt > 1) {
 877                                         NFSM_DISSECT(tl, uint32_t *,
 878                                             2 * NFSX_UNSIGNED);
 879                                         i = fxdr_unsigned(int, *tl++);
 880                                         j = fxdr_unsigned(int, *tl);
 881                                 }
 882                         }
 883                 }
 884                 if (nd->nd_repstat != 0) {
 885                         if (nd->nd_repstat == NFSERR_BADSESSION &&
 886                             nmp != NULL && dssep == NULL) {
 887                                 /*
 888                                  * If this is a client side MDS RPC, mark
 889                                  * the MDS session defunct and initiate
 890                                  * recovery, as required.
 891                                  * The nfsess_defunct field is protected by
 892                                  * the NFSLOCKMNT()/nm_mtx lock and not the
 893                                  * nfsess_mtx lock to simplify its handling,
 894                                  * for the MDS session. This lock is also
 895                                  * sufficient for nfsess_sessionid, since it
 896                                  * never changes in the structure.
 897                                  */
 898                                 NFSCL_DEBUG(1, "Got badsession\n");
 899                                 NFSLOCKCLSTATE();
 900                                 NFSLOCKMNT(nmp);
 901                                 sep = NFSMNT_MDSSESSION(nmp);
 902                                 if (bcmp(sep->nfsess_sessionid, nd->nd_sequence,
 903                                     NFSX_V4SESSIONID) == 0) {
 904                                         /* Initiate recovery. */
 905                                         sep->nfsess_defunct = 1;
 906                                         NFSCL_DEBUG(1, "Marked defunct\n");
 907                                         if (nmp->nm_clp != NULL) {
 908                                                 nmp->nm_clp->nfsc_flags |=
 909                                                     NFSCLFLAGS_RECOVER;
 910                                                 wakeup(nmp->nm_clp);
 911                                         }
 912                                 }
 913                                 NFSUNLOCKCLSTATE();
 914                                 /*
 915                                  * Sleep for up to 1sec waiting for a new
 916                                  * session.
 917                                  */
 918                                 mtx_sleep(&nmp->nm_sess, &nmp->nm_mtx, PZERO,
 919                                     "nfsbadsess", hz);
 920                                 /*
 921                                  * Get the session again, in case a new one
 922                                  * has been created during the sleep.
 923                                  */
 924                                 sep = NFSMNT_MDSSESSION(nmp);
 925                                 NFSUNLOCKMNT(nmp);
 926                                 if ((nd->nd_flag & ND_LOOPBADSESS) != 0) {
 927                                         reterr = nfsv4_sequencelookup(nmp, sep,
 928                                             &slotpos, &maxslot, &slotseq,
 929                                             sessionid);
 930                                         if (reterr == 0) {
 931                                                 /* Fill in new session info. */
 932                                                 NFSCL_DEBUG(1,
 933                                                   "Filling in new sequence\n");
 934                                                 tl = nd->nd_sequence;
 935                                                 bcopy(sessionid, tl,
 936                                                     NFSX_V4SESSIONID);
 937                                                 tl += NFSX_V4SESSIONID /
 938                                                     NFSX_UNSIGNED;
 939                                                 *tl++ = txdr_unsigned(slotseq);
 940                                                 *tl++ = txdr_unsigned(slotpos);
 941                                                 *tl = txdr_unsigned(maxslot);
 942                                         }
 943                                         if (reterr == NFSERR_BADSESSION ||
 944                                             reterr == 0) {
 945                                                 NFSCL_DEBUG(1,
 946                                                     "Badsession looping\n");
 947                                                 m_freem(nd->nd_mrep);
 948                                                 nd->nd_mrep = NULL;
 949                                                 goto tryagain;
 950                                         }
 951                                         nd->nd_repstat = reterr;
 952                                         NFSCL_DEBUG(1, "Got err=%d\n", reterr);
 953                                 }
 954                         }
 955                         if (((nd->nd_repstat == NFSERR_DELAY ||
 956                               nd->nd_repstat == NFSERR_GRACE) &&
 957                              (nd->nd_flag & ND_NFSV4) &&
 958                              nd->nd_procnum != NFSPROC_DELEGRETURN &&
 959                              nd->nd_procnum != NFSPROC_SETATTR &&
 960                              nd->nd_procnum != NFSPROC_READ &&
 961                              nd->nd_procnum != NFSPROC_READDS &&
 962                              nd->nd_procnum != NFSPROC_WRITE &&
 963                              nd->nd_procnum != NFSPROC_WRITEDS &&
 964                              nd->nd_procnum != NFSPROC_OPEN &&
 965                              nd->nd_procnum != NFSPROC_CREATE &&
 966                              nd->nd_procnum != NFSPROC_OPENCONFIRM &&
 967                              nd->nd_procnum != NFSPROC_OPENDOWNGRADE &&
 968                              nd->nd_procnum != NFSPROC_CLOSE &&
 969                              nd->nd_procnum != NFSPROC_LOCK &&
 970                              nd->nd_procnum != NFSPROC_LOCKU) ||
 971                             (nd->nd_repstat == NFSERR_DELAY &&
 972                              (nd->nd_flag & ND_NFSV4) == 0) ||
 973                             nd->nd_repstat == NFSERR_RESOURCE) {
 974                                 if (trylater_delay > NFS_TRYLATERDEL)
 975                                         trylater_delay = NFS_TRYLATERDEL;
 976                                 waituntil = NFSD_MONOSEC + trylater_delay;
 977                                 while (NFSD_MONOSEC < waituntil)
 978                                         (void) nfs_catnap(PZERO, 0, "nfstry");
 979                                 trylater_delay *= 2;
 980                                 if (slot != -1) {
 981                                         mtx_lock(&sep->nfsess_mtx);
 982                                         sep->nfsess_slotseq[slot]++;
 983                                         *nd->nd_slotseq = txdr_unsigned(
 984                                             sep->nfsess_slotseq[slot]);
 985                                         mtx_unlock(&sep->nfsess_mtx);
 986                                 }
 987                                 m_freem(nd->nd_mrep);
 988                                 nd->nd_mrep = NULL;
 989                                 goto tryagain;
 990                         }
 991
 992                         /*
 993                          * If the File Handle was stale, invalidate the
 994                          * lookup cache, just in case.
 995                          * (vp != NULL implies a client side call)
 996                          */
 997                         if (nd->nd_repstat == ESTALE && vp != NULL) {
 998                                 cache_purge(vp);
 999                                 if (ncl_call_invalcaches != NULL)
1000                                         (*ncl_call_invalcaches)(vp);
1001                         }
1002                 }
1003                 if ((nd->nd_flag & ND_NFSV4) != 0) {
1004                         /* Free the slot, as required. */
1005                         if (freeslot != -1)
1006                                 nfsv4_freeslot(sep, freeslot);
1007                         /*
1008                          * If this op is Putfh, throw its results away.
1009                          */
1010                         if (j >= 10000)
1011                                 NFSCL_DEBUG(1, "nop=%d nst=%d\n", i, j);
1012                         if (nmp != NULL && i == NFSV4OP_PUTFH && j == 0) {
1013                                 NFSM_DISSECT(tl,u_int32_t *,2 * NFSX_UNSIGNED);
1014                                 i = fxdr_unsigned(int, *tl++);
1015                                 j = fxdr_unsigned(int, *tl);
1016                                 if (j >= 10000)
1017                                         NFSCL_DEBUG(1, "n2op=%d n2st=%d\n", i,
1018                                             j);
1019                                 /*
1020                                  * All Compounds that do an Op that must
1021                                  * be in sequence consist of NFSV4OP_PUTFH
1022                                  * followed by one of these. As such, we
1023                                  * can determine if the seqid# should be
1024                                  * incremented, here.
1025                                  */
1026                                 if ((i == NFSV4OP_OPEN ||
1027                                      i == NFSV4OP_OPENCONFIRM ||
1028                                      i == NFSV4OP_OPENDOWNGRADE ||
1029                                      i == NFSV4OP_CLOSE ||
1030                                      i == NFSV4OP_LOCK ||
1031                                      i == NFSV4OP_LOCKU) &&
1032                                     (j == 0 ||
1033                                      (j != NFSERR_STALECLIENTID &&
1034                                       j != NFSERR_STALESTATEID &&
1035                                       j != NFSERR_BADSTATEID &&
1036                                       j != NFSERR_BADSEQID &&
1037                                       j != NFSERR_BADXDR &&
1038                                       j != NFSERR_RESOURCE &&
1039                                       j != NFSERR_NOFILEHANDLE)))
1040                                         nd->nd_flag |= ND_INCRSEQID;
1041                         }
1042                         /*
1043                          * If this op's status is non-zero, mark
1044                          * that there is no more data to process.
1045                          */
1046                         if (j)
1047                                 nd->nd_flag |= ND_NOMOREDATA;
1048
1049                         /*
1050                          * If R_DONTRECOVER is set, replace the stale error
1051                          * reply, so that recovery isn't initiated.
1052                          */
1053                         if ((nd->nd_repstat == NFSERR_STALECLIENTID ||
1054                              nd->nd_repstat == NFSERR_BADSESSION ||
1055                              nd->nd_repstat == NFSERR_STALESTATEID) &&
1056                             rep != NULL && (rep->r_flags & R_DONTRECOVER))
1057                                 nd->nd_repstat = NFSERR_STALEDONTRECOVER;
1058                 }
1059         }
1060
1061 #ifdef KDTRACE_HOOKS
1062         if (nmp != NULL && dtrace_nfscl_nfs234_done_probe != NULL) {
1063                 uint32_t probe_id;
1064                 int probe_procnum;
1065
1066                 if (nd->nd_flag & ND_NFSV4) {
1067                         probe_id = nfscl_nfs4_done_probes[nd->nd_procnum];
1068                         probe_procnum = nd->nd_procnum;
1069                 } else if (nd->nd_flag & ND_NFSV3) {
1070                         probe_id = nfscl_nfs3_done_probes[procnum];
1071                         probe_procnum = procnum;
1072                 } else {
1073                         probe_id = nfscl_nfs2_done_probes[nd->nd_procnum];
1074                         probe_procnum = procnum;
1075                 }
1076                 if (probe_id != 0)
1077                         (dtrace_nfscl_nfs234_done_probe)(probe_id, vp,
1078                             nd->nd_mreq, cred, probe_procnum, 0);
1079         }
1080 #endif
1081
1082         m_freem(nd->nd_mreq);
1083         if (usegssname == 0)
1084                 AUTH_DESTROY(auth);
1085         if (rep != NULL)
1086                 FREE((caddr_t)rep, M_NFSDREQ);
1087         if (set_sigset)
1088                 newnfs_restore_sigmask(td, &oldset);
1089         return (0);
1090 nfsmout:
1091         mbuf_freem(nd->nd_mrep);
1092         mbuf_freem(nd->nd_mreq);
1093         if (usegssname == 0)
1094                 AUTH_DESTROY(auth);
1095         if (rep != NULL)
1096                 FREE((caddr_t)rep, M_NFSDREQ);
1097         if (set_sigset)
1098                 newnfs_restore_sigmask(td, &oldset);
1099         return (error);
1100 }
1101
1102 /*
1103  * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
1104  * wait for all requests to complete. This is used by forced unmounts
1105  * to terminate any outstanding RPCs.
1106  */
1107 int
1108 newnfs_nmcancelreqs(struct nfsmount *nmp)
1109 {
1110
1111         if (nmp->nm_sockreq.nr_client != NULL)
1112                 CLNT_CLOSE(nmp->nm_sockreq.nr_client);
1113         return (0);
1114 }
1115
1116 /*
1117  * Any signal that can interrupt an NFS operation in an intr mount
1118  * should be added to this set. SIGSTOP and SIGKILL cannot be masked.
1119  */
1120 int newnfs_sig_set[] = {
1121         SIGINT,
1122         SIGTERM,
1123         SIGHUP,
1124         SIGKILL,
1125         SIGQUIT
1126 };
1127
1128 /*
1129  * Check to see if one of the signals in our subset is pending on
1130  * the process (in an intr mount).
1131  */
1132 static int
1133 nfs_sig_pending(sigset_t set)
1134 {
1135         int i;
1136
1137         for (i = 0 ; i < nitems(newnfs_sig_set); i++)
1138                 if (SIGISMEMBER(set, newnfs_sig_set[i]))
1139                         return (1);
1140         return (0);
1141 }
1142
1143 /*
1144  * The set/restore sigmask functions are used to (temporarily) overwrite
1145  * the thread td_sigmask during an RPC call (for example). These are also
1146  * used in other places in the NFS client that might tsleep().
1147  */
1148 void
1149 newnfs_set_sigmask(struct thread *td, sigset_t *oldset)
1150 {
1151         sigset_t newset;
1152         int i;
1153         struct proc *p;
1154
1155         SIGFILLSET(newset);
1156         if (td == NULL)
1157                 td = curthread; /* XXX */
1158         p = td->td_proc;
1159         /* Remove the NFS set of signals from newset */
1160         PROC_LOCK(p);
1161         mtx_lock(&p->p_sigacts->ps_mtx);
1162         for (i = 0 ; i < nitems(newnfs_sig_set); i++) {
1163                 /*
1164                  * But make sure we leave the ones already masked
1165                  * by the process, ie. remove the signal from the
1166                  * temporary signalmask only if it wasn't already
1167                  * in p_sigmask.
1168                  */
1169                 if (!SIGISMEMBER(td->td_sigmask, newnfs_sig_set[i]) &&
1170                     !SIGISMEMBER(p->p_sigacts->ps_sigignore, newnfs_sig_set[i]))
1171                         SIGDELSET(newset, newnfs_sig_set[i]);
1172         }
1173         mtx_unlock(&p->p_sigacts->ps_mtx);
1174         kern_sigprocmask(td, SIG_SETMASK, &newset, oldset,
1175             SIGPROCMASK_PROC_LOCKED);
1176         PROC_UNLOCK(p);
1177 }
1178
1179 void
1180 newnfs_restore_sigmask(struct thread *td, sigset_t *set)
1181 {
1182         if (td == NULL)
1183                 td = curthread; /* XXX */
1184         kern_sigprocmask(td, SIG_SETMASK, set, NULL, 0);
1185 }
1186
1187 /*
1188  * NFS wrapper to msleep(), that shoves a new p_sigmask and restores the
1189  * old one after msleep() returns.
1190  */
1191 int
1192 newnfs_msleep(struct thread *td, void *ident, struct mtx *mtx, int priority, char *wmesg, int timo)
1193 {
1194         sigset_t oldset;
1195         int error;
1196         struct proc *p;
1197
1198         if ((priority & PCATCH) == 0)
1199                 return msleep(ident, mtx, priority, wmesg, timo);
1200         if (td == NULL)
1201                 td = curthread; /* XXX */
1202         newnfs_set_sigmask(td, &oldset);
1203         error = msleep(ident, mtx, priority, wmesg, timo);
1204         newnfs_restore_sigmask(td, &oldset);
1205         p = td->td_proc;
1206         return (error);
1207 }
1208
1209 /*
1210  * Test for a termination condition pending on the process.
1211  * This is used for NFSMNT_INT mounts.
1212  */
1213 int
1214 newnfs_sigintr(struct nfsmount *nmp, struct thread *td)
1215 {
1216         struct proc *p;
1217         sigset_t tmpset;
1218
1219         /* Terminate all requests while attempting a forced unmount. */
1220         if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF)
1221                 return (EIO);
1222         if (!(nmp->nm_flag & NFSMNT_INT))
1223                 return (0);
1224         if (td == NULL)
1225                 return (0);
1226         p = td->td_proc;
1227         PROC_LOCK(p);
1228         tmpset = p->p_siglist;
1229         SIGSETOR(tmpset, td->td_siglist);
1230         SIGSETNAND(tmpset, td->td_sigmask);
1231         mtx_lock(&p->p_sigacts->ps_mtx);
1232         SIGSETNAND(tmpset, p->p_sigacts->ps_sigignore);
1233         mtx_unlock(&p->p_sigacts->ps_mtx);
1234         if ((SIGNOTEMPTY(p->p_siglist) || SIGNOTEMPTY(td->td_siglist))
1235             && nfs_sig_pending(tmpset)) {
1236                 PROC_UNLOCK(p);
1237                 return (EINTR);
1238         }
1239         PROC_UNLOCK(p);
1240         return (0);
1241 }
1242
1243 static int
1244 nfs_msg(struct thread *td, const char *server, const char *msg, int error)
1245 {
1246         struct proc *p;
1247
1248         p = td ? td->td_proc : NULL;
1249         if (error) {
1250                 tprintf(p, LOG_INFO, "nfs server %s: %s, error %d\n",
1251                     server, msg, error);
1252         } else {
1253                 tprintf(p, LOG_INFO, "nfs server %s: %s\n", server, msg);
1254         }
1255         return (0);
1256 }
1257
1258 static void
1259 nfs_down(struct nfsmount *nmp, struct thread *td, const char *msg,
1260     int error, int flags)
1261 {
1262         if (nmp == NULL)
1263                 return;
1264         mtx_lock(&nmp->nm_mtx);
1265         if ((flags & NFSSTA_TIMEO) && !(nmp->nm_state & NFSSTA_TIMEO)) {
1266                 nmp->nm_state |= NFSSTA_TIMEO;
1267                 mtx_unlock(&nmp->nm_mtx);
1268                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1269                     VQ_NOTRESP, 0);
1270         } else
1271                 mtx_unlock(&nmp->nm_mtx);
1272         mtx_lock(&nmp->nm_mtx);
1273         if ((flags & NFSSTA_LOCKTIMEO) && !(nmp->nm_state & NFSSTA_LOCKTIMEO)) {
1274                 nmp->nm_state |= NFSSTA_LOCKTIMEO;
1275                 mtx_unlock(&nmp->nm_mtx);
1276                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1277                     VQ_NOTRESPLOCK, 0);
1278         } else
1279                 mtx_unlock(&nmp->nm_mtx);
1280         nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, error);
1281 }
1282
1283 static void
1284 nfs_up(struct nfsmount *nmp, struct thread *td, const char *msg,
1285     int flags, int tprintfmsg)
1286 {
1287         if (nmp == NULL)
1288                 return;
1289         if (tprintfmsg) {
1290                 nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, 0);
1291         }
1292
1293         mtx_lock(&nmp->nm_mtx);
1294         if ((flags & NFSSTA_TIMEO) && (nmp->nm_state & NFSSTA_TIMEO)) {
1295                 nmp->nm_state &= ~NFSSTA_TIMEO;
1296                 mtx_unlock(&nmp->nm_mtx);
1297                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1298                     VQ_NOTRESP, 1);
1299         } else
1300                 mtx_unlock(&nmp->nm_mtx);
1301
1302         mtx_lock(&nmp->nm_mtx);
1303         if ((flags & NFSSTA_LOCKTIMEO) && (nmp->nm_state & NFSSTA_LOCKTIMEO)) {
1304                 nmp->nm_state &= ~NFSSTA_LOCKTIMEO;
1305                 mtx_unlock(&nmp->nm_mtx);
1306                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1307                     VQ_NOTRESPLOCK, 1);
1308         } else
1309                 mtx_unlock(&nmp->nm_mtx);
1310 }
1311