sys/fs/nfs/nfs_commonkrpc.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1989, 1991, 1993, 1995
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Rick Macklem at The University of Guelph.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  */
  35
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD$");
  38
  39 /*
  40  * Socket operations for use by nfs
  41  */
  42
  43 #include "opt_kgssapi.h"
  44 #include "opt_nfs.h"
  45
  46 #include <sys/param.h>
  47 #include <sys/systm.h>
  48 #include <sys/kernel.h>
  49 #include <sys/limits.h>
  50 #include <sys/lock.h>
  51 #include <sys/malloc.h>
  52 #include <sys/mbuf.h>
  53 #include <sys/mount.h>
  54 #include <sys/mutex.h>
  55 #include <sys/proc.h>
  56 #include <sys/signalvar.h>
  57 #include <sys/syscallsubr.h>
  58 #include <sys/sysctl.h>
  59 #include <sys/syslog.h>
  60 #include <sys/vnode.h>
  61
  62 #include <rpc/rpc.h>
  63 #include <rpc/krpc.h>
  64
  65 #include <kgssapi/krb5/kcrypto.h>
  66
  67 #include <fs/nfs/nfsport.h>
  68
  69 #ifdef KDTRACE_HOOKS
  70 #include <sys/dtrace_bsd.h>
  71
  72 dtrace_nfsclient_nfs23_start_probe_func_t
  73                 dtrace_nfscl_nfs234_start_probe;
  74
  75 dtrace_nfsclient_nfs23_done_probe_func_t
  76                 dtrace_nfscl_nfs234_done_probe;
  77
  78 /*
  79  * Registered probes by RPC type.
  80  */
  81 uint32_t        nfscl_nfs2_start_probes[NFSV41_NPROCS + 1];
  82 uint32_t        nfscl_nfs2_done_probes[NFSV41_NPROCS + 1];
  83
  84 uint32_t        nfscl_nfs3_start_probes[NFSV41_NPROCS + 1];
  85 uint32_t        nfscl_nfs3_done_probes[NFSV41_NPROCS + 1];
  86
  87 uint32_t        nfscl_nfs4_start_probes[NFSV41_NPROCS + 1];
  88 uint32_t        nfscl_nfs4_done_probes[NFSV41_NPROCS + 1];
  89 #endif
  90
  91 NFSSTATESPINLOCK;
  92 NFSREQSPINLOCK;
  93 NFSDLOCKMUTEX;
  94 NFSCLSTATEMUTEX;
  95 extern struct nfsstatsv1 nfsstatsv1;
  96 extern struct nfsreqhead nfsd_reqq;
  97 extern int nfscl_ticks;
  98 extern void (*ncl_call_invalcaches)(struct vnode *);
  99 extern int nfs_numnfscbd;
 100 extern int nfscl_debuglevel;
 101 extern int nfsrv_lease;
 102
 103 SVCPOOL         *nfscbd_pool;
 104 static int      nfsrv_gsscallbackson = 0;
 105 static int      nfs_bufpackets = 4;
 106 static int      nfs_reconnects;
 107 static int      nfs3_jukebox_delay = 10;
 108 static int      nfs_skip_wcc_data_onerr = 1;
 109 static int      nfs_dsretries = 2;
 110
 111 SYSCTL_DECL(_vfs_nfs);
 112
 113 SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0,
 114     "Buffer reservation size 2 < x < 64");
 115 SYSCTL_INT(_vfs_nfs, OID_AUTO, reconnects, CTLFLAG_RD, &nfs_reconnects, 0,
 116     "Number of times the nfs client has had to reconnect");
 117 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs3_jukebox_delay, CTLFLAG_RW, &nfs3_jukebox_delay, 0,
 118     "Number of seconds to delay a retry after receiving EJUKEBOX");
 119 SYSCTL_INT(_vfs_nfs, OID_AUTO, skip_wcc_data_onerr, CTLFLAG_RW, &nfs_skip_wcc_data_onerr, 0,
 120     "Disable weak cache consistency checking when server returns an error");
 121 SYSCTL_INT(_vfs_nfs, OID_AUTO, dsretries, CTLFLAG_RW, &nfs_dsretries, 0,
 122     "Number of retries for a DS RPC before failure");
 123
 124 static void     nfs_down(struct nfsmount *, struct thread *, const char *,
 125     int, int);
 126 static void     nfs_up(struct nfsmount *, struct thread *, const char *,
 127     int, int);
 128 static int      nfs_msg(struct thread *, const char *, const char *, int);
 129
 130 struct nfs_cached_auth {
 131         int             ca_refs; /* refcount, including 1 from the cache */
 132         uid_t           ca_uid;  /* uid that corresponds to this auth */
 133         AUTH            *ca_auth; /* RPC auth handle */
 134 };
 135
 136 static int nfsv2_procid[NFS_V3NPROCS] = {
 137         NFSV2PROC_NULL,
 138         NFSV2PROC_GETATTR,
 139         NFSV2PROC_SETATTR,
 140         NFSV2PROC_LOOKUP,
 141         NFSV2PROC_NOOP,
 142         NFSV2PROC_READLINK,
 143         NFSV2PROC_READ,
 144         NFSV2PROC_WRITE,
 145         NFSV2PROC_CREATE,
 146         NFSV2PROC_MKDIR,
 147         NFSV2PROC_SYMLINK,
 148         NFSV2PROC_CREATE,
 149         NFSV2PROC_REMOVE,
 150         NFSV2PROC_RMDIR,
 151         NFSV2PROC_RENAME,
 152         NFSV2PROC_LINK,
 153         NFSV2PROC_READDIR,
 154         NFSV2PROC_NOOP,
 155         NFSV2PROC_STATFS,
 156         NFSV2PROC_NOOP,
 157         NFSV2PROC_NOOP,
 158         NFSV2PROC_NOOP,
 159 };
 160
 161 /*
 162  * Initialize sockets and congestion for a new NFS connection.
 163  * We do not free the sockaddr if error.
 164  * Which arguments are set to NULL indicate what kind of call it is.
 165  * cred == NULL --> a call to connect to a pNFS DS
 166  * nmp == NULL --> indicates an upcall to userland or a NFSv4.0 callback
 167  */
 168 int
 169 newnfs_connect(struct nfsmount *nmp, struct nfssockreq *nrp,
 170     struct ucred *cred, NFSPROC_T *p, int callback_retry_mult)
 171 {
 172         int rcvreserve, sndreserve;
 173         int pktscale, pktscalesav;
 174         struct sockaddr *saddr;
 175         struct ucred *origcred;
 176         CLIENT *client;
 177         struct netconfig *nconf;
 178         struct socket *so;
 179         int one = 1, retries, error = 0;
 180         struct thread *td = curthread;
 181         SVCXPRT *xprt;
 182         struct timeval timo;
 183
 184         /*
 185          * We need to establish the socket using the credentials of
 186          * the mountpoint.  Some parts of this process (such as
 187          * sobind() and soconnect()) will use the curent thread's
 188          * credential instead of the socket credential.  To work
 189          * around this, temporarily change the current thread's
 190          * credential to that of the mountpoint.
 191          *
 192          * XXX: It would be better to explicitly pass the correct
 193          * credential to sobind() and soconnect().
 194          */
 195         origcred = td->td_ucred;
 196
 197         /*
 198          * Use the credential in nr_cred, if not NULL.
 199          */
 200         if (nrp->nr_cred != NULL)
 201                 td->td_ucred = nrp->nr_cred;
 202         else
 203                 td->td_ucred = cred;
 204         saddr = nrp->nr_nam;
 205
 206         if (saddr->sa_family == AF_INET)
 207                 if (nrp->nr_sotype == SOCK_DGRAM)
 208                         nconf = getnetconfigent("udp");
 209                 else
 210                         nconf = getnetconfigent("tcp");
 211         else if (saddr->sa_family == AF_LOCAL)
 212                 nconf = getnetconfigent("local");
 213         else
 214                 if (nrp->nr_sotype == SOCK_DGRAM)
 215                         nconf = getnetconfigent("udp6");
 216                 else
 217                         nconf = getnetconfigent("tcp6");
 218
 219         pktscale = nfs_bufpackets;
 220         if (pktscale < 2)
 221                 pktscale = 2;
 222         if (pktscale > 64)
 223                 pktscale = 64;
 224         pktscalesav = pktscale;
 225         /*
 226          * soreserve() can fail if sb_max is too small, so shrink pktscale
 227          * and try again if there is an error.
 228          * Print a log message suggesting increasing sb_max.
 229          * Creating a socket and doing this is necessary since, if the
 230          * reservation sizes are too large and will make soreserve() fail,
 231          * the connection will work until a large send is attempted and
 232          * then it will loop in the krpc code.
 233          */
 234         so = NULL;
 235         saddr = NFSSOCKADDR(nrp->nr_nam, struct sockaddr *);
 236         error = socreate(saddr->sa_family, &so, nrp->nr_sotype,
 237             nrp->nr_soproto, td->td_ucred, td);
 238         if (error) {
 239                 td->td_ucred = origcred;
 240                 goto out;
 241         }
 242         do {
 243             if (error != 0 && pktscale > 2) {
 244                 if (nmp != NULL && nrp->nr_sotype == SOCK_STREAM &&
 245                     pktscale == pktscalesav)
 246                     printf("Consider increasing kern.ipc.maxsockbuf\n");
 247                 pktscale--;
 248             }
 249             if (nrp->nr_sotype == SOCK_DGRAM) {
 250                 if (nmp != NULL) {
 251                         sndreserve = (NFS_MAXDGRAMDATA + NFS_MAXPKTHDR) *
 252                             pktscale;
 253                         rcvreserve = (NFS_MAXDGRAMDATA + NFS_MAXPKTHDR) *
 254                             pktscale;
 255                 } else {
 256                         sndreserve = rcvreserve = 1024 * pktscale;
 257                 }
 258             } else {
 259                 if (nrp->nr_sotype != SOCK_STREAM)
 260                         panic("nfscon sotype");
 261                 if (nmp != NULL) {
 262                         sndreserve = (NFS_MAXBSIZE + NFS_MAXXDR +
 263                             sizeof (u_int32_t)) * pktscale;
 264                         rcvreserve = (NFS_MAXBSIZE + NFS_MAXXDR +
 265                             sizeof (u_int32_t)) * pktscale;
 266                 } else {
 267                         sndreserve = rcvreserve = 1024 * pktscale;
 268                 }
 269             }
 270             error = soreserve(so, sndreserve, rcvreserve);
 271             if (error != 0 && nmp != NULL && nrp->nr_sotype == SOCK_STREAM &&
 272                 pktscale <= 2)
 273                 printf("Must increase kern.ipc.maxsockbuf or reduce"
 274                     " rsize, wsize\n");
 275         } while (error != 0 && pktscale > 2);
 276         soclose(so);
 277         if (error) {
 278                 td->td_ucred = origcred;
 279                 goto out;
 280         }
 281
 282         client = clnt_reconnect_create(nconf, saddr, nrp->nr_prog,
 283             nrp->nr_vers, sndreserve, rcvreserve);
 284         CLNT_CONTROL(client, CLSET_WAITCHAN, "nfsreq");
 285         if (nmp != NULL) {
 286                 if ((nmp->nm_flag & NFSMNT_INT))
 287                         CLNT_CONTROL(client, CLSET_INTERRUPTIBLE, &one);
 288                 if ((nmp->nm_flag & NFSMNT_RESVPORT))
 289                         CLNT_CONTROL(client, CLSET_PRIVPORT, &one);
 290                 if (NFSHASSOFT(nmp)) {
 291                         if (nmp->nm_sotype == SOCK_DGRAM)
 292                                 /*
 293                                  * For UDP, the large timeout for a reconnect
 294                                  * will be set to "nm_retry * nm_timeo / 2", so
 295                                  * we only want to do 2 reconnect timeout
 296                                  * retries.
 297                                  */
 298                                 retries = 2;
 299                         else
 300                                 retries = nmp->nm_retry;
 301                 } else
 302                         retries = INT_MAX;
 303                 if (NFSHASNFSV4N(nmp)) {
 304                         if (cred != NULL) {
 305                                 if (NFSHASSOFT(nmp)) {
 306                                         /*
 307                                          * This should be a DS mount.
 308                                          * Use CLSET_TIMEOUT to set the timeout
 309                                          * for connections to DSs instead of
 310                                          * specifying a timeout on each RPC.
 311                                          * This is done so that SO_SNDTIMEO
 312                                          * is set on the TCP socket as well
 313                                          * as specifying a time limit when
 314                                          * waiting for an RPC reply.  Useful
 315                                          * if the send queue for the TCP
 316                                          * connection has become constipated,
 317                                          * due to a failed DS.
 318                                          * The choice of lease_duration / 4 is
 319                                          * fairly arbitrary, but seems to work
 320                                          * ok, with a lower bound of 10sec.
 321                                          */
 322                                         timo.tv_sec = nfsrv_lease / 4;
 323                                         if (timo.tv_sec < 10)
 324                                                 timo.tv_sec = 10;
 325                                         timo.tv_usec = 0;
 326                                         CLNT_CONTROL(client, CLSET_TIMEOUT,
 327                                             &timo);
 328                                 }
 329                                 /*
 330                                  * Make sure the nfscbd_pool doesn't get
 331                                  * destroyed while doing this.
 332                                  */
 333                                 NFSD_LOCK();
 334                                 if (nfs_numnfscbd > 0) {
 335                                         nfs_numnfscbd++;
 336                                         NFSD_UNLOCK();
 337                                         xprt = svc_vc_create_backchannel(
 338                                             nfscbd_pool);
 339                                         CLNT_CONTROL(client, CLSET_BACKCHANNEL,
 340                                             xprt);
 341                                         NFSD_LOCK();
 342                                         nfs_numnfscbd--;
 343                                         if (nfs_numnfscbd == 0)
 344                                                 wakeup(&nfs_numnfscbd);
 345                                 }
 346                                 NFSD_UNLOCK();
 347                         } else {
 348                                 /*
 349                                  * cred == NULL for a DS connect.
 350                                  * For connects to a DS, set a retry limit
 351                                  * so that failed DSs will be detected.
 352                                  * This is ok for NFSv4.1, since a DS does
 353                                  * not maintain open/lock state and is the
 354                                  * only case where using a "soft" mount is
 355                                  * recommended for NFSv4.
 356                                  * For mounts from the MDS to DS, this is done
 357                                  * via mount options, but that is not the case
 358                                  * here.  The retry limit here can be adjusted
 359                                  * via the sysctl vfs.nfs.dsretries.
 360                                  * See the comment above w.r.t. timeout.
 361                                  */
 362                                 timo.tv_sec = nfsrv_lease / 4;
 363                                 if (timo.tv_sec < 10)
 364                                         timo.tv_sec = 10;
 365                                 timo.tv_usec = 0;
 366                                 CLNT_CONTROL(client, CLSET_TIMEOUT, &timo);
 367                                 retries = nfs_dsretries;
 368                         }
 369                 }
 370         } else {
 371                 /*
 372                  * Three cases:
 373                  * - Null RPC callback to client
 374                  * - Non-Null RPC callback to client, wait a little longer
 375                  * - upcalls to nfsuserd and gssd (clp == NULL)
 376                  */
 377                 if (callback_retry_mult == 0) {
 378                         retries = NFSV4_UPCALLRETRY;
 379                         CLNT_CONTROL(client, CLSET_PRIVPORT, &one);
 380                 } else {
 381                         retries = NFSV4_CALLBACKRETRY * callback_retry_mult;
 382                 }
 383         }
 384         CLNT_CONTROL(client, CLSET_RETRIES, &retries);
 385
 386         if (nmp != NULL) {
 387                 /*
 388                  * For UDP, there are 2 timeouts:
 389                  * - CLSET_RETRY_TIMEOUT sets the initial timeout for the timer
 390                  *   that does a retransmit of an RPC request using the same
 391                  *   socket and xid. This is what you normally want to do,
 392                  *   since NFS servers depend on "same xid" for their
 393                  *   Duplicate Request Cache.
 394                  * - timeout specified in CLNT_CALL_MBUF(), which specifies when
 395                  *   retransmits on the same socket should fail and a fresh
 396                  *   socket created. Each of these timeouts counts as one
 397                  *   CLSET_RETRIES as set above.
 398                  * Set the initial retransmit timeout for UDP. This timeout
 399                  * doesn't exist for TCP and the following call just fails,
 400                  * which is ok.
 401                  */
 402                 timo.tv_sec = nmp->nm_timeo / NFS_HZ;
 403                 timo.tv_usec = (nmp->nm_timeo % NFS_HZ) * 1000000 / NFS_HZ;
 404                 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, &timo);
 405         }
 406
 407         mtx_lock(&nrp->nr_mtx);
 408         if (nrp->nr_client != NULL) {
 409                 mtx_unlock(&nrp->nr_mtx);
 410                 /*
 411                  * Someone else already connected.
 412                  */
 413                 CLNT_RELEASE(client);
 414         } else {
 415                 nrp->nr_client = client;
 416                 /*
 417                  * Protocols that do not require connections may be optionally
 418                  * left unconnected for servers that reply from a port other
 419                  * than NFS_PORT.
 420                  */
 421                 if (nmp == NULL || (nmp->nm_flag & NFSMNT_NOCONN) == 0) {
 422                         mtx_unlock(&nrp->nr_mtx);
 423                         CLNT_CONTROL(client, CLSET_CONNECT, &one);
 424                 } else
 425                         mtx_unlock(&nrp->nr_mtx);
 426         }
 427
 428
 429         /* Restore current thread's credentials. */
 430         td->td_ucred = origcred;
 431
 432 out:
 433         NFSEXITCODE(error);
 434         return (error);
 435 }
 436
 437 /*
 438  * NFS disconnect. Clean up and unlink.
 439  */
 440 void
 441 newnfs_disconnect(struct nfssockreq *nrp)
 442 {
 443         CLIENT *client;
 444
 445         mtx_lock(&nrp->nr_mtx);
 446         if (nrp->nr_client != NULL) {
 447                 client = nrp->nr_client;
 448                 nrp->nr_client = NULL;
 449                 mtx_unlock(&nrp->nr_mtx);
 450                 rpc_gss_secpurge_call(client);
 451                 CLNT_CLOSE(client);
 452                 CLNT_RELEASE(client);
 453         } else {
 454                 mtx_unlock(&nrp->nr_mtx);
 455         }
 456 }
 457
 458 static AUTH *
 459 nfs_getauth(struct nfssockreq *nrp, int secflavour, char *clnt_principal,
 460     char *srv_principal, gss_OID mech_oid, struct ucred *cred)
 461 {
 462         rpc_gss_service_t svc;
 463         AUTH *auth;
 464
 465         switch (secflavour) {
 466         case RPCSEC_GSS_KRB5:
 467         case RPCSEC_GSS_KRB5I:
 468         case RPCSEC_GSS_KRB5P:
 469                 if (!mech_oid) {
 470                         if (!rpc_gss_mech_to_oid_call("kerberosv5", &mech_oid))
 471                                 return (NULL);
 472                 }
 473                 if (secflavour == RPCSEC_GSS_KRB5)
 474                         svc = rpc_gss_svc_none;
 475                 else if (secflavour == RPCSEC_GSS_KRB5I)
 476                         svc = rpc_gss_svc_integrity;
 477                 else
 478                         svc = rpc_gss_svc_privacy;
 479
 480                 if (clnt_principal == NULL)
 481                         auth = rpc_gss_secfind_call(nrp->nr_client, cred,
 482                             srv_principal, mech_oid, svc);
 483                 else {
 484                         auth = rpc_gss_seccreate_call(nrp->nr_client, cred,
 485                             clnt_principal, srv_principal, "kerberosv5",
 486                             svc, NULL, NULL, NULL);
 487                         return (auth);
 488                 }
 489                 if (auth != NULL)
 490                         return (auth);
 491                 /* fallthrough */
 492         case AUTH_SYS:
 493         default:
 494                 return (authunix_create(cred));
 495
 496         }
 497 }
 498
 499 /*
 500  * Callback from the RPC code to generate up/down notifications.
 501  */
 502
 503 struct nfs_feedback_arg {
 504         struct nfsmount *nf_mount;
 505         int             nf_lastmsg;     /* last tprintf */
 506         int             nf_tprintfmsg;
 507         struct thread   *nf_td;
 508 };
 509
 510 static void
 511 nfs_feedback(int type, int proc, void *arg)
 512 {
 513         struct nfs_feedback_arg *nf = (struct nfs_feedback_arg *) arg;
 514         struct nfsmount *nmp = nf->nf_mount;
 515         time_t now;
 516
 517         switch (type) {
 518         case FEEDBACK_REXMIT2:
 519         case FEEDBACK_RECONNECT:
 520                 now = NFSD_MONOSEC;
 521                 if (nf->nf_lastmsg + nmp->nm_tprintf_delay < now) {
 522                         nfs_down(nmp, nf->nf_td,
 523                             "not responding", 0, NFSSTA_TIMEO);
 524                         nf->nf_tprintfmsg = TRUE;
 525                         nf->nf_lastmsg = now;
 526                 }
 527                 break;
 528
 529         case FEEDBACK_OK:
 530                 nfs_up(nf->nf_mount, nf->nf_td,
 531                     "is alive again", NFSSTA_TIMEO, nf->nf_tprintfmsg);
 532                 break;
 533         }
 534 }
 535
 536 /*
 537  * newnfs_request - goes something like this
 538  *      - does the rpc by calling the krpc layer
 539  *      - break down rpc header and return with nfs reply
 540  * nb: always frees up nd_mreq mbuf list
 541  */
 542 int
 543 newnfs_request(struct nfsrv_descript *nd, struct nfsmount *nmp,
 544     struct nfsclient *clp, struct nfssockreq *nrp, vnode_t vp,
 545     struct thread *td, struct ucred *cred, u_int32_t prog, u_int32_t vers,
 546     u_char *retsum, int toplevel, u_int64_t *xidp, struct nfsclsession *dssep)
 547 {
 548         uint32_t retseq, retval, slotseq, *tl;
 549         time_t waituntil;
 550         int i = 0, j = 0, opcnt, set_sigset = 0, slot;
 551         int error = 0, usegssname = 0, secflavour = AUTH_SYS;
 552         int freeslot, maxslot, reterr, slotpos, timeo;
 553         u_int16_t procnum;
 554         u_int trylater_delay = 1;
 555         struct nfs_feedback_arg nf;
 556         struct timeval timo;
 557         AUTH *auth;
 558         struct rpc_callextra ext;
 559         enum clnt_stat stat;
 560         struct nfsreq *rep = NULL;
 561         char *srv_principal = NULL, *clnt_principal = NULL;
 562         sigset_t oldset;
 563         struct ucred *authcred;
 564         struct nfsclsession *sep;
 565         uint8_t sessionid[NFSX_V4SESSIONID];
 566
 567         sep = dssep;
 568         if (xidp != NULL)
 569                 *xidp = 0;
 570         /* Reject requests while attempting a forced unmount. */
 571         if (nmp != NULL && NFSCL_FORCEDISM(nmp->nm_mountp)) {
 572                 m_freem(nd->nd_mreq);
 573                 return (ESTALE);
 574         }
 575
 576         /*
 577          * Set authcred, which is used to acquire RPC credentials to
 578          * the cred argument, by default. The crhold() should not be
 579          * necessary, but will ensure that some future code change
 580          * doesn't result in the credential being free'd prematurely.
 581          */
 582         authcred = crhold(cred);
 583
 584         /* For client side interruptible mounts, mask off the signals. */
 585         if (nmp != NULL && td != NULL && NFSHASINT(nmp)) {
 586                 newnfs_set_sigmask(td, &oldset);
 587                 set_sigset = 1;
 588         }
 589
 590         /*
 591          * XXX if not already connected call nfs_connect now. Longer
 592          * term, change nfs_mount to call nfs_connect unconditionally
 593          * and let clnt_reconnect_create handle reconnects.
 594          */
 595         if (nrp->nr_client == NULL)
 596                 newnfs_connect(nmp, nrp, cred, td, 0);
 597
 598         /*
 599          * For a client side mount, nmp is != NULL and clp == NULL. For
 600          * server calls (callbacks or upcalls), nmp == NULL.
 601          */
 602         if (clp != NULL) {
 603                 NFSLOCKSTATE();
 604                 if ((clp->lc_flags & LCL_GSS) && nfsrv_gsscallbackson) {
 605                         secflavour = RPCSEC_GSS_KRB5;
 606                         if (nd->nd_procnum != NFSPROC_NULL) {
 607                                 if (clp->lc_flags & LCL_GSSINTEGRITY)
 608                                         secflavour = RPCSEC_GSS_KRB5I;
 609                                 else if (clp->lc_flags & LCL_GSSPRIVACY)
 610                                         secflavour = RPCSEC_GSS_KRB5P;
 611                         }
 612                 }
 613                 NFSUNLOCKSTATE();
 614         } else if (nmp != NULL && NFSHASKERB(nmp) &&
 615              nd->nd_procnum != NFSPROC_NULL) {
 616                 if (NFSHASALLGSSNAME(nmp) && nmp->nm_krbnamelen > 0)
 617                         nd->nd_flag |= ND_USEGSSNAME;
 618                 if ((nd->nd_flag & ND_USEGSSNAME) != 0) {
 619                         /*
 620                          * If there is a client side host based credential,
 621                          * use that, otherwise use the system uid, if set.
 622                          * The system uid is in the nmp->nm_sockreq.nr_cred
 623                          * credentials.
 624                          */
 625                         if (nmp->nm_krbnamelen > 0) {
 626                                 usegssname = 1;
 627                                 clnt_principal = nmp->nm_krbname;
 628                         } else if (nmp->nm_uid != (uid_t)-1) {
 629                                 KASSERT(nmp->nm_sockreq.nr_cred != NULL,
 630                                     ("newnfs_request: NULL nr_cred"));
 631                                 crfree(authcred);
 632                                 authcred = crhold(nmp->nm_sockreq.nr_cred);
 633                         }
 634                 } else if (nmp->nm_krbnamelen == 0 &&
 635                     nmp->nm_uid != (uid_t)-1 && cred->cr_uid == (uid_t)0) {
 636                         /*
 637                          * If there is no host based principal name and
 638                          * the system uid is set and this is root, use the
 639                          * system uid, since root won't have user
 640                          * credentials in a credentials cache file.
 641                          * The system uid is in the nmp->nm_sockreq.nr_cred
 642                          * credentials.
 643                          */
 644                         KASSERT(nmp->nm_sockreq.nr_cred != NULL,
 645                             ("newnfs_request: NULL nr_cred"));
 646                         crfree(authcred);
 647                         authcred = crhold(nmp->nm_sockreq.nr_cred);
 648                 }
 649                 if (NFSHASINTEGRITY(nmp))
 650                         secflavour = RPCSEC_GSS_KRB5I;
 651                 else if (NFSHASPRIVACY(nmp))
 652                         secflavour = RPCSEC_GSS_KRB5P;
 653                 else
 654                         secflavour = RPCSEC_GSS_KRB5;
 655                 srv_principal = NFSMNT_SRVKRBNAME(nmp);
 656         } else if (nmp != NULL && !NFSHASKERB(nmp) &&
 657             nd->nd_procnum != NFSPROC_NULL &&
 658             (nd->nd_flag & ND_USEGSSNAME) != 0) {
 659                 /*
 660                  * Use the uid that did the mount when the RPC is doing
 661                  * NFSv4 system operations, as indicated by the
 662                  * ND_USEGSSNAME flag, for the AUTH_SYS case.
 663                  * The credentials in nm_sockreq.nr_cred were used for the
 664                  * mount.
 665                  */
 666                 KASSERT(nmp->nm_sockreq.nr_cred != NULL,
 667                     ("newnfs_request: NULL nr_cred"));
 668                 crfree(authcred);
 669                 authcred = crhold(nmp->nm_sockreq.nr_cred);
 670         }
 671
 672         if (nmp != NULL) {
 673                 bzero(&nf, sizeof(struct nfs_feedback_arg));
 674                 nf.nf_mount = nmp;
 675                 nf.nf_td = td;
 676                 nf.nf_lastmsg = NFSD_MONOSEC -
 677                     ((nmp->nm_tprintf_delay)-(nmp->nm_tprintf_initial_delay));
 678         }
 679
 680         if (nd->nd_procnum == NFSPROC_NULL)
 681                 auth = authnone_create();
 682         else if (usegssname) {
 683                 /*
 684                  * For this case, the authenticator is held in the
 685                  * nfssockreq structure, so don't release the reference count
 686                  * held on it. --> Don't AUTH_DESTROY() it in this function.
 687                  */
 688                 if (nrp->nr_auth == NULL)
 689                         nrp->nr_auth = nfs_getauth(nrp, secflavour,
 690                             clnt_principal, srv_principal, NULL, authcred);
 691                 else
 692                         rpc_gss_refresh_auth_call(nrp->nr_auth);
 693                 auth = nrp->nr_auth;
 694         } else
 695                 auth = nfs_getauth(nrp, secflavour, NULL,
 696                     srv_principal, NULL, authcred);
 697         crfree(authcred);
 698         if (auth == NULL) {
 699                 m_freem(nd->nd_mreq);
 700                 if (set_sigset)
 701                         newnfs_restore_sigmask(td, &oldset);
 702                 return (EACCES);
 703         }
 704         bzero(&ext, sizeof(ext));
 705         ext.rc_auth = auth;
 706         if (nmp != NULL) {
 707                 ext.rc_feedback = nfs_feedback;
 708                 ext.rc_feedback_arg = &nf;
 709         }
 710
 711         procnum = nd->nd_procnum;
 712         if ((nd->nd_flag & ND_NFSV4) &&
 713             nd->nd_procnum != NFSPROC_NULL &&
 714             nd->nd_procnum != NFSV4PROC_CBCOMPOUND)
 715                 procnum = NFSV4PROC_COMPOUND;
 716
 717         if (nmp != NULL) {
 718                 NFSINCRGLOBAL(nfsstatsv1.rpcrequests);
 719
 720                 /* Map the procnum to the old NFSv2 one, as required. */
 721                 if ((nd->nd_flag & ND_NFSV2) != 0) {
 722                         if (nd->nd_procnum < NFS_V3NPROCS)
 723                                 procnum = nfsv2_procid[nd->nd_procnum];
 724                         else
 725                                 procnum = NFSV2PROC_NOOP;
 726                 }
 727
 728                 /*
 729                  * Now only used for the R_DONTRECOVER case, but until that is
 730                  * supported within the krpc code, I need to keep a queue of
 731                  * outstanding RPCs for nfsv4 client requests.
 732                  */
 733                 if ((nd->nd_flag & ND_NFSV4) && procnum == NFSV4PROC_COMPOUND)
 734                         rep = malloc(sizeof(struct nfsreq),
 735                             M_NFSDREQ, M_WAITOK);
 736 #ifdef KDTRACE_HOOKS
 737                 if (dtrace_nfscl_nfs234_start_probe != NULL) {
 738                         uint32_t probe_id;
 739                         int probe_procnum;
 740
 741                         if (nd->nd_flag & ND_NFSV4) {
 742                                 probe_id =
 743                                     nfscl_nfs4_start_probes[nd->nd_procnum];
 744                                 probe_procnum = nd->nd_procnum;
 745                         } else if (nd->nd_flag & ND_NFSV3) {
 746                                 probe_id = nfscl_nfs3_start_probes[procnum];
 747                                 probe_procnum = procnum;
 748                         } else {
 749                                 probe_id =
 750                                     nfscl_nfs2_start_probes[nd->nd_procnum];
 751                                 probe_procnum = procnum;
 752                         }
 753                         if (probe_id != 0)
 754                                 (dtrace_nfscl_nfs234_start_probe)
 755                                     (probe_id, vp, nd->nd_mreq, cred,
 756                                      probe_procnum);
 757                 }
 758 #endif
 759         }
 760         freeslot = -1;          /* Set to slot that needs to be free'd */
 761 tryagain:
 762         slot = -1;              /* Slot that needs a sequence# increment. */
 763         /*
 764          * This timeout specifies when a new socket should be created,
 765          * along with new xid values. For UDP, this should be done
 766          * infrequently, since retransmits of RPC requests should normally
 767          * use the same xid.
 768          */
 769         if (nmp == NULL) {
 770                 timo.tv_usec = 0;
 771                 if (clp == NULL)
 772                         timo.tv_sec = NFSV4_UPCALLTIMEO;
 773                 else
 774                         timo.tv_sec = NFSV4_CALLBACKTIMEO;
 775         } else {
 776                 if (nrp->nr_sotype != SOCK_DGRAM) {
 777                         timo.tv_usec = 0;
 778                         if ((nmp->nm_flag & NFSMNT_NFSV4))
 779                                 timo.tv_sec = INT_MAX;
 780                         else
 781                                 timo.tv_sec = NFS_TCPTIMEO;
 782                 } else {
 783                         if (NFSHASSOFT(nmp)) {
 784                                 /*
 785                                  * CLSET_RETRIES is set to 2, so this should be
 786                                  * half of the total timeout required.
 787                                  */
 788                                 timeo = nmp->nm_retry * nmp->nm_timeo / 2;
 789                                 if (timeo < 1)
 790                                         timeo = 1;
 791                                 timo.tv_sec = timeo / NFS_HZ;
 792                                 timo.tv_usec = (timeo % NFS_HZ) * 1000000 /
 793                                     NFS_HZ;
 794                         } else {
 795                                 /* For UDP hard mounts, use a large value. */
 796                                 timo.tv_sec = NFS_MAXTIMEO / NFS_HZ;
 797                                 timo.tv_usec = 0;
 798                         }
 799                 }
 800
 801                 if (rep != NULL) {
 802                         rep->r_flags = 0;
 803                         rep->r_nmp = nmp;
 804                         /*
 805                          * Chain request into list of outstanding requests.
 806                          */
 807                         NFSLOCKREQ();
 808                         TAILQ_INSERT_TAIL(&nfsd_reqq, rep, r_chain);
 809                         NFSUNLOCKREQ();
 810                 }
 811         }
 812
 813         nd->nd_mrep = NULL;
 814         if (clp != NULL && sep != NULL)
 815                 stat = clnt_bck_call(nrp->nr_client, &ext, procnum,
 816                     nd->nd_mreq, &nd->nd_mrep, timo, sep->nfsess_xprt);
 817         else
 818                 stat = CLNT_CALL_MBUF(nrp->nr_client, &ext, procnum,
 819                     nd->nd_mreq, &nd->nd_mrep, timo);
 820         NFSCL_DEBUG(2, "clnt call=%d\n", stat);
 821
 822         if (rep != NULL) {
 823                 /*
 824                  * RPC done, unlink the request.
 825                  */
 826                 NFSLOCKREQ();
 827                 TAILQ_REMOVE(&nfsd_reqq, rep, r_chain);
 828                 NFSUNLOCKREQ();
 829         }
 830
 831         /*
 832          * If there was a successful reply and a tprintf msg.
 833          * tprintf a response.
 834          */
 835         if (stat == RPC_SUCCESS) {
 836                 error = 0;
 837         } else if (stat == RPC_TIMEDOUT) {
 838                 NFSINCRGLOBAL(nfsstatsv1.rpctimeouts);
 839                 error = ETIMEDOUT;
 840         } else if (stat == RPC_VERSMISMATCH) {
 841                 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
 842                 error = EOPNOTSUPP;
 843         } else if (stat == RPC_PROGVERSMISMATCH) {
 844                 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
 845                 error = EPROTONOSUPPORT;
 846         } else if (stat == RPC_INTR) {
 847                 error = EINTR;
 848         } else if (stat == RPC_CANTSEND || stat == RPC_CANTRECV ||
 849              stat == RPC_SYSTEMERROR) {
 850                 /* Check for a session slot that needs to be free'd. */
 851                 if ((nd->nd_flag & (ND_NFSV41 | ND_HASSLOTID)) ==
 852                     (ND_NFSV41 | ND_HASSLOTID) && nmp != NULL &&
 853                     nd->nd_procnum != NFSPROC_NULL) {
 854                         /*
 855                          * This should only occur when either the MDS or
 856                          * a client has an RPC against a DS fail.
 857                          * This happens because these cases use "soft"
 858                          * connections that can time out and fail.
 859                          * The slot used for this RPC is now in a
 860                          * non-deterministic state, but if the slot isn't
 861                          * free'd, threads can get stuck waiting for a slot.
 862                          */
 863                         if (sep == NULL)
 864                                 sep = nfsmnt_mdssession(nmp);
 865                         /*
 866                          * Bump the sequence# out of range, so that reuse of
 867                          * this slot will result in an NFSERR_SEQMISORDERED
 868                          * error and not a bogus cached RPC reply.
 869                          */
 870                         mtx_lock(&sep->nfsess_mtx);
 871                         sep->nfsess_slotseq[nd->nd_slotid] += 10;
 872                         mtx_unlock(&sep->nfsess_mtx);
 873                         /* And free the slot. */
 874                         nfsv4_freeslot(sep, nd->nd_slotid);
 875                 }
 876                 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
 877                 error = ENXIO;
 878         } else {
 879                 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
 880                 error = EACCES;
 881         }
 882         if (error) {
 883                 m_freem(nd->nd_mreq);
 884                 if (usegssname == 0)
 885                         AUTH_DESTROY(auth);
 886                 if (rep != NULL)
 887                         free(rep, M_NFSDREQ);
 888                 if (set_sigset)
 889                         newnfs_restore_sigmask(td, &oldset);
 890                 return (error);
 891         }
 892
 893         KASSERT(nd->nd_mrep != NULL, ("mrep shouldn't be NULL if no error\n"));
 894
 895         /*
 896          * Search for any mbufs that are not a multiple of 4 bytes long
 897          * or with m_data not longword aligned.
 898          * These could cause pointer alignment problems, so copy them to
 899          * well aligned mbufs.
 900          */
 901         newnfs_realign(&nd->nd_mrep, M_WAITOK);
 902         nd->nd_md = nd->nd_mrep;
 903         nd->nd_dpos = NFSMTOD(nd->nd_md, caddr_t);
 904         nd->nd_repstat = 0;
 905         if (nd->nd_procnum != NFSPROC_NULL &&
 906             nd->nd_procnum != NFSV4PROC_CBNULL) {
 907                 /* If sep == NULL, set it to the default in nmp. */
 908                 if (sep == NULL && nmp != NULL)
 909                         sep = nfsmnt_mdssession(nmp);
 910                 /*
 911                  * and now the actual NFS xdr.
 912                  */
 913                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 914                 nd->nd_repstat = fxdr_unsigned(u_int32_t, *tl);
 915                 if (nd->nd_repstat >= 10000)
 916                         NFSCL_DEBUG(1, "proc=%d reps=%d\n", (int)nd->nd_procnum,
 917                             (int)nd->nd_repstat);
 918
 919                 /*
 920                  * Get rid of the tag, return count and SEQUENCE result for
 921                  * NFSv4.
 922                  */
 923                 if ((nd->nd_flag & ND_NFSV4) != 0) {
 924                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 925                         i = fxdr_unsigned(int, *tl);
 926                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
 927                         if (error)
 928                                 goto nfsmout;
 929                         NFSM_DISSECT(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 930                         opcnt = fxdr_unsigned(int, *tl++);
 931                         i = fxdr_unsigned(int, *tl++);
 932                         j = fxdr_unsigned(int, *tl);
 933                         if (j >= 10000)
 934                                 NFSCL_DEBUG(1, "fop=%d fst=%d\n", i, j);
 935                         /*
 936                          * If the first op is Sequence, free up the slot.
 937                          */
 938                         if ((nmp != NULL && i == NFSV4OP_SEQUENCE && j != 0) ||
 939                             (clp != NULL && i == NFSV4OP_CBSEQUENCE && j != 0))
 940                                 NFSCL_DEBUG(1, "failed seq=%d\n", j);
 941                         if (((nmp != NULL && i == NFSV4OP_SEQUENCE && j == 0) ||
 942                             (clp != NULL && i == NFSV4OP_CBSEQUENCE &&
 943                             j == 0)) && sep != NULL) {
 944                                 if (i == NFSV4OP_SEQUENCE)
 945                                         NFSM_DISSECT(tl, uint32_t *,
 946                                             NFSX_V4SESSIONID +
 947                                             5 * NFSX_UNSIGNED);
 948                                 else
 949                                         NFSM_DISSECT(tl, uint32_t *,
 950                                             NFSX_V4SESSIONID +
 951                                             4 * NFSX_UNSIGNED);
 952                                 mtx_lock(&sep->nfsess_mtx);
 953                                 if (bcmp(tl, sep->nfsess_sessionid,
 954                                     NFSX_V4SESSIONID) == 0) {
 955                                         tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
 956                                         retseq = fxdr_unsigned(uint32_t, *tl++);
 957                                         slot = fxdr_unsigned(int, *tl++);
 958                                         freeslot = slot;
 959                                         if (retseq != sep->nfsess_slotseq[slot])
 960                                                 printf("retseq diff 0x%x\n",
 961                                                     retseq);
 962                                         retval = fxdr_unsigned(uint32_t, *++tl);
 963                                         if ((retval + 1) < sep->nfsess_foreslots
 964                                             )
 965                                                 sep->nfsess_foreslots = (retval
 966                                                     + 1);
 967                                         else if ((retval + 1) >
 968                                             sep->nfsess_foreslots)
 969                                                 sep->nfsess_foreslots = (retval
 970                                                     < 64) ? (retval + 1) : 64;
 971                                 }
 972                                 mtx_unlock(&sep->nfsess_mtx);
 973
 974                                 /* Grab the op and status for the next one. */
 975                                 if (opcnt > 1) {
 976                                         NFSM_DISSECT(tl, uint32_t *,
 977                                             2 * NFSX_UNSIGNED);
 978                                         i = fxdr_unsigned(int, *tl++);
 979                                         j = fxdr_unsigned(int, *tl);
 980                                 }
 981                         }
 982                 }
 983                 if (nd->nd_repstat != 0) {
 984                         if (nd->nd_repstat == NFSERR_BADSESSION &&
 985                             nmp != NULL && dssep == NULL &&
 986                             (nd->nd_flag & ND_NFSV41) != 0) {
 987                                 /*
 988                                  * If this is a client side MDS RPC, mark
 989                                  * the MDS session defunct and initiate
 990                                  * recovery, as required.
 991                                  * The nfsess_defunct field is protected by
 992                                  * the NFSLOCKMNT()/nm_mtx lock and not the
 993                                  * nfsess_mtx lock to simplify its handling,
 994                                  * for the MDS session. This lock is also
 995                                  * sufficient for nfsess_sessionid, since it
 996                                  * never changes in the structure.
 997                                  */
 998                                 NFSCL_DEBUG(1, "Got badsession\n");
 999                                 NFSLOCKCLSTATE();
1000                                 NFSLOCKMNT(nmp);
1001                                 sep = NFSMNT_MDSSESSION(nmp);
1002                                 if (bcmp(sep->nfsess_sessionid, nd->nd_sequence,
1003                                     NFSX_V4SESSIONID) == 0) {
1004                                         /* Initiate recovery. */
1005                                         sep->nfsess_defunct = 1;
1006                                         NFSCL_DEBUG(1, "Marked defunct\n");
1007                                         if (nmp->nm_clp != NULL) {
1008                                                 nmp->nm_clp->nfsc_flags |=
1009                                                     NFSCLFLAGS_RECOVER;
1010                                                 wakeup(nmp->nm_clp);
1011                                         }
1012                                 }
1013                                 NFSUNLOCKCLSTATE();
1014                                 /*
1015                                  * Sleep for up to 1sec waiting for a new
1016                                  * session.
1017                                  */
1018                                 mtx_sleep(&nmp->nm_sess, &nmp->nm_mtx, PZERO,
1019                                     "nfsbadsess", hz);
1020                                 /*
1021                                  * Get the session again, in case a new one
1022                                  * has been created during the sleep.
1023                                  */
1024                                 sep = NFSMNT_MDSSESSION(nmp);
1025                                 NFSUNLOCKMNT(nmp);
1026                                 if ((nd->nd_flag & ND_LOOPBADSESS) != 0) {
1027                                         reterr = nfsv4_sequencelookup(nmp, sep,
1028                                             &slotpos, &maxslot, &slotseq,
1029                                             sessionid);
1030                                         if (reterr == 0) {
1031                                                 /* Fill in new session info. */
1032                                                 NFSCL_DEBUG(1,
1033                                                   "Filling in new sequence\n");
1034                                                 tl = nd->nd_sequence;
1035                                                 bcopy(sessionid, tl,
1036                                                     NFSX_V4SESSIONID);
1037                                                 tl += NFSX_V4SESSIONID /
1038                                                     NFSX_UNSIGNED;
1039                                                 *tl++ = txdr_unsigned(slotseq);
1040                                                 *tl++ = txdr_unsigned(slotpos);
1041                                                 *tl = txdr_unsigned(maxslot);
1042                                         }
1043                                         if (reterr == NFSERR_BADSESSION ||
1044                                             reterr == 0) {
1045                                                 NFSCL_DEBUG(1,
1046                                                     "Badsession looping\n");
1047                                                 m_freem(nd->nd_mrep);
1048                                                 nd->nd_mrep = NULL;
1049                                                 goto tryagain;
1050                                         }
1051                                         nd->nd_repstat = reterr;
1052                                         NFSCL_DEBUG(1, "Got err=%d\n", reterr);
1053                                 }
1054                         }
1055                         /*
1056                          * When clp != NULL, it is a callback and all
1057                          * callback operations can be retried for NFSERR_DELAY.
1058                          */
1059                         if (((nd->nd_repstat == NFSERR_DELAY ||
1060                               nd->nd_repstat == NFSERR_GRACE) &&
1061                              (nd->nd_flag & ND_NFSV4) && (clp != NULL ||
1062                              (nd->nd_procnum != NFSPROC_DELEGRETURN &&
1063                              nd->nd_procnum != NFSPROC_SETATTR &&
1064                              nd->nd_procnum != NFSPROC_READ &&
1065                              nd->nd_procnum != NFSPROC_READDS &&
1066                              nd->nd_procnum != NFSPROC_WRITE &&
1067                              nd->nd_procnum != NFSPROC_WRITEDS &&
1068                              nd->nd_procnum != NFSPROC_OPEN &&
1069                              nd->nd_procnum != NFSPROC_CREATE &&
1070                              nd->nd_procnum != NFSPROC_OPENCONFIRM &&
1071                              nd->nd_procnum != NFSPROC_OPENDOWNGRADE &&
1072                              nd->nd_procnum != NFSPROC_CLOSE &&
1073                              nd->nd_procnum != NFSPROC_LOCK &&
1074                              nd->nd_procnum != NFSPROC_LOCKU))) ||
1075                             (nd->nd_repstat == NFSERR_DELAY &&
1076                              (nd->nd_flag & ND_NFSV4) == 0) ||
1077                             nd->nd_repstat == NFSERR_RESOURCE) {
1078                                 if (trylater_delay > NFS_TRYLATERDEL)
1079                                         trylater_delay = NFS_TRYLATERDEL;
1080                                 waituntil = NFSD_MONOSEC + trylater_delay;
1081                                 while (NFSD_MONOSEC < waituntil)
1082                                         (void) nfs_catnap(PZERO, 0, "nfstry");
1083                                 trylater_delay *= 2;
1084                                 if (slot != -1) {
1085                                         mtx_lock(&sep->nfsess_mtx);
1086                                         sep->nfsess_slotseq[slot]++;
1087                                         *nd->nd_slotseq = txdr_unsigned(
1088                                             sep->nfsess_slotseq[slot]);
1089                                         mtx_unlock(&sep->nfsess_mtx);
1090                                 }
1091                                 m_freem(nd->nd_mrep);
1092                                 nd->nd_mrep = NULL;
1093                                 goto tryagain;
1094                         }
1095
1096                         /*
1097                          * If the File Handle was stale, invalidate the
1098                          * lookup cache, just in case.
1099                          * (vp != NULL implies a client side call)
1100                          */
1101                         if (nd->nd_repstat == ESTALE && vp != NULL) {
1102                                 cache_purge(vp);
1103                                 if (ncl_call_invalcaches != NULL)
1104                                         (*ncl_call_invalcaches)(vp);
1105                         }
1106                 }
1107                 if ((nd->nd_flag & ND_NFSV4) != 0) {
1108                         /* Free the slot, as required. */
1109                         if (freeslot != -1)
1110                                 nfsv4_freeslot(sep, freeslot);
1111                         /*
1112                          * If this op is Putfh, throw its results away.
1113                          */
1114                         if (j >= 10000)
1115                                 NFSCL_DEBUG(1, "nop=%d nst=%d\n", i, j);
1116                         if (nmp != NULL && i == NFSV4OP_PUTFH && j == 0) {
1117                                 NFSM_DISSECT(tl,u_int32_t *,2 * NFSX_UNSIGNED);
1118                                 i = fxdr_unsigned(int, *tl++);
1119                                 j = fxdr_unsigned(int, *tl);
1120                                 if (j >= 10000)
1121                                         NFSCL_DEBUG(1, "n2op=%d n2st=%d\n", i,
1122                                             j);
1123                                 /*
1124                                  * All Compounds that do an Op that must
1125                                  * be in sequence consist of NFSV4OP_PUTFH
1126                                  * followed by one of these. As such, we
1127                                  * can determine if the seqid# should be
1128                                  * incremented, here.
1129                                  */
1130                                 if ((i == NFSV4OP_OPEN ||
1131                                      i == NFSV4OP_OPENCONFIRM ||
1132                                      i == NFSV4OP_OPENDOWNGRADE ||
1133                                      i == NFSV4OP_CLOSE ||
1134                                      i == NFSV4OP_LOCK ||
1135                                      i == NFSV4OP_LOCKU) &&
1136                                     (j == 0 ||
1137                                      (j != NFSERR_STALECLIENTID &&
1138                                       j != NFSERR_STALESTATEID &&
1139                                       j != NFSERR_BADSTATEID &&
1140                                       j != NFSERR_BADSEQID &&
1141                                       j != NFSERR_BADXDR &&
1142                                       j != NFSERR_RESOURCE &&
1143                                       j != NFSERR_NOFILEHANDLE)))
1144                                         nd->nd_flag |= ND_INCRSEQID;
1145                         }
1146                         /*
1147                          * If this op's status is non-zero, mark
1148                          * that there is no more data to process.
1149                          * The exception is Setattr, which always has xdr
1150                          * when it has failed.
1151                          */
1152                         if (j != 0 && i != NFSV4OP_SETATTR)
1153                                 nd->nd_flag |= ND_NOMOREDATA;
1154
1155                         /*
1156                          * If R_DONTRECOVER is set, replace the stale error
1157                          * reply, so that recovery isn't initiated.
1158                          */
1159                         if ((nd->nd_repstat == NFSERR_STALECLIENTID ||
1160                              nd->nd_repstat == NFSERR_BADSESSION ||
1161                              nd->nd_repstat == NFSERR_STALESTATEID) &&
1162                             rep != NULL && (rep->r_flags & R_DONTRECOVER))
1163                                 nd->nd_repstat = NFSERR_STALEDONTRECOVER;
1164                 }
1165         }
1166
1167 #ifdef KDTRACE_HOOKS
1168         if (nmp != NULL && dtrace_nfscl_nfs234_done_probe != NULL) {
1169                 uint32_t probe_id;
1170                 int probe_procnum;
1171
1172                 if (nd->nd_flag & ND_NFSV4) {
1173                         probe_id = nfscl_nfs4_done_probes[nd->nd_procnum];
1174                         probe_procnum = nd->nd_procnum;
1175                 } else if (nd->nd_flag & ND_NFSV3) {
1176                         probe_id = nfscl_nfs3_done_probes[procnum];
1177                         probe_procnum = procnum;
1178                 } else {
1179                         probe_id = nfscl_nfs2_done_probes[nd->nd_procnum];
1180                         probe_procnum = procnum;
1181                 }
1182                 if (probe_id != 0)
1183                         (dtrace_nfscl_nfs234_done_probe)(probe_id, vp,
1184                             nd->nd_mreq, cred, probe_procnum, 0);
1185         }
1186 #endif
1187
1188         m_freem(nd->nd_mreq);
1189         if (usegssname == 0)
1190                 AUTH_DESTROY(auth);
1191         if (rep != NULL)
1192                 free(rep, M_NFSDREQ);
1193         if (set_sigset)
1194                 newnfs_restore_sigmask(td, &oldset);
1195         return (0);
1196 nfsmout:
1197         mbuf_freem(nd->nd_mrep);
1198         mbuf_freem(nd->nd_mreq);
1199         if (usegssname == 0)
1200                 AUTH_DESTROY(auth);
1201         if (rep != NULL)
1202                 free(rep, M_NFSDREQ);
1203         if (set_sigset)
1204                 newnfs_restore_sigmask(td, &oldset);
1205         return (error);
1206 }
1207
1208 /*
1209  * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
1210  * wait for all requests to complete. This is used by forced unmounts
1211  * to terminate any outstanding RPCs.
1212  */
1213 int
1214 newnfs_nmcancelreqs(struct nfsmount *nmp)
1215 {
1216         struct nfsclds *dsp;
1217         struct __rpc_client *cl;
1218
1219         if (nmp->nm_sockreq.nr_client != NULL)
1220                 CLNT_CLOSE(nmp->nm_sockreq.nr_client);
1221 lookformore:
1222         NFSLOCKMNT(nmp);
1223         TAILQ_FOREACH(dsp, &nmp->nm_sess, nfsclds_list) {
1224                 NFSLOCKDS(dsp);
1225                 if (dsp != TAILQ_FIRST(&nmp->nm_sess) &&
1226                     (dsp->nfsclds_flags & NFSCLDS_CLOSED) == 0 &&
1227                     dsp->nfsclds_sockp != NULL &&
1228                     dsp->nfsclds_sockp->nr_client != NULL) {
1229                         dsp->nfsclds_flags |= NFSCLDS_CLOSED;
1230                         cl = dsp->nfsclds_sockp->nr_client;
1231                         NFSUNLOCKDS(dsp);
1232                         NFSUNLOCKMNT(nmp);
1233                         CLNT_CLOSE(cl);
1234                         goto lookformore;
1235                 }
1236                 NFSUNLOCKDS(dsp);
1237         }
1238         NFSUNLOCKMNT(nmp);
1239         return (0);
1240 }
1241
1242 /*
1243  * Any signal that can interrupt an NFS operation in an intr mount
1244  * should be added to this set. SIGSTOP and SIGKILL cannot be masked.
1245  */
1246 int newnfs_sig_set[] = {
1247         SIGINT,
1248         SIGTERM,
1249         SIGHUP,
1250         SIGKILL,
1251         SIGQUIT
1252 };
1253
1254 /*
1255  * Check to see if one of the signals in our subset is pending on
1256  * the process (in an intr mount).
1257  */
1258 static int
1259 nfs_sig_pending(sigset_t set)
1260 {
1261         int i;
1262
1263         for (i = 0 ; i < nitems(newnfs_sig_set); i++)
1264                 if (SIGISMEMBER(set, newnfs_sig_set[i]))
1265                         return (1);
1266         return (0);
1267 }
1268
1269 /*
1270  * The set/restore sigmask functions are used to (temporarily) overwrite
1271  * the thread td_sigmask during an RPC call (for example). These are also
1272  * used in other places in the NFS client that might tsleep().
1273  */
1274 void
1275 newnfs_set_sigmask(struct thread *td, sigset_t *oldset)
1276 {
1277         sigset_t newset;
1278         int i;
1279         struct proc *p;
1280
1281         SIGFILLSET(newset);
1282         if (td == NULL)
1283                 td = curthread; /* XXX */
1284         p = td->td_proc;
1285         /* Remove the NFS set of signals from newset */
1286         PROC_LOCK(p);
1287         mtx_lock(&p->p_sigacts->ps_mtx);
1288         for (i = 0 ; i < nitems(newnfs_sig_set); i++) {
1289                 /*
1290                  * But make sure we leave the ones already masked
1291                  * by the process, ie. remove the signal from the
1292                  * temporary signalmask only if it wasn't already
1293                  * in p_sigmask.
1294                  */
1295                 if (!SIGISMEMBER(td->td_sigmask, newnfs_sig_set[i]) &&
1296                     !SIGISMEMBER(p->p_sigacts->ps_sigignore, newnfs_sig_set[i]))
1297                         SIGDELSET(newset, newnfs_sig_set[i]);
1298         }
1299         mtx_unlock(&p->p_sigacts->ps_mtx);
1300         kern_sigprocmask(td, SIG_SETMASK, &newset, oldset,
1301             SIGPROCMASK_PROC_LOCKED);
1302         PROC_UNLOCK(p);
1303 }
1304
1305 void
1306 newnfs_restore_sigmask(struct thread *td, sigset_t *set)
1307 {
1308         if (td == NULL)
1309                 td = curthread; /* XXX */
1310         kern_sigprocmask(td, SIG_SETMASK, set, NULL, 0);
1311 }
1312
1313 /*
1314  * NFS wrapper to msleep(), that shoves a new p_sigmask and restores the
1315  * old one after msleep() returns.
1316  */
1317 int
1318 newnfs_msleep(struct thread *td, void *ident, struct mtx *mtx, int priority, char *wmesg, int timo)
1319 {
1320         sigset_t oldset;
1321         int error;
1322
1323         if ((priority & PCATCH) == 0)
1324                 return msleep(ident, mtx, priority, wmesg, timo);
1325         if (td == NULL)
1326                 td = curthread; /* XXX */
1327         newnfs_set_sigmask(td, &oldset);
1328         error = msleep(ident, mtx, priority, wmesg, timo);
1329         newnfs_restore_sigmask(td, &oldset);
1330         return (error);
1331 }
1332
1333 /*
1334  * Test for a termination condition pending on the process.
1335  * This is used for NFSMNT_INT mounts.
1336  */
1337 int
1338 newnfs_sigintr(struct nfsmount *nmp, struct thread *td)
1339 {
1340         struct proc *p;
1341         sigset_t tmpset;
1342
1343         /* Terminate all requests while attempting a forced unmount. */
1344         if (NFSCL_FORCEDISM(nmp->nm_mountp))
1345                 return (EIO);
1346         if (!(nmp->nm_flag & NFSMNT_INT))
1347                 return (0);
1348         if (td == NULL)
1349                 return (0);
1350         p = td->td_proc;
1351         PROC_LOCK(p);
1352         tmpset = p->p_siglist;
1353         SIGSETOR(tmpset, td->td_siglist);
1354         SIGSETNAND(tmpset, td->td_sigmask);
1355         mtx_lock(&p->p_sigacts->ps_mtx);
1356         SIGSETNAND(tmpset, p->p_sigacts->ps_sigignore);
1357         mtx_unlock(&p->p_sigacts->ps_mtx);
1358         if ((SIGNOTEMPTY(p->p_siglist) || SIGNOTEMPTY(td->td_siglist))
1359             && nfs_sig_pending(tmpset)) {
1360                 PROC_UNLOCK(p);
1361                 return (EINTR);
1362         }
1363         PROC_UNLOCK(p);
1364         return (0);
1365 }
1366
1367 static int
1368 nfs_msg(struct thread *td, const char *server, const char *msg, int error)
1369 {
1370         struct proc *p;
1371
1372         p = td ? td->td_proc : NULL;
1373         if (error) {
1374                 tprintf(p, LOG_INFO, "nfs server %s: %s, error %d\n",
1375                     server, msg, error);
1376         } else {
1377                 tprintf(p, LOG_INFO, "nfs server %s: %s\n", server, msg);
1378         }
1379         return (0);
1380 }
1381
1382 static void
1383 nfs_down(struct nfsmount *nmp, struct thread *td, const char *msg,
1384     int error, int flags)
1385 {
1386         if (nmp == NULL)
1387                 return;
1388         mtx_lock(&nmp->nm_mtx);
1389         if ((flags & NFSSTA_TIMEO) && !(nmp->nm_state & NFSSTA_TIMEO)) {
1390                 nmp->nm_state |= NFSSTA_TIMEO;
1391                 mtx_unlock(&nmp->nm_mtx);
1392                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1393                     VQ_NOTRESP, 0);
1394         } else
1395                 mtx_unlock(&nmp->nm_mtx);
1396         mtx_lock(&nmp->nm_mtx);
1397         if ((flags & NFSSTA_LOCKTIMEO) && !(nmp->nm_state & NFSSTA_LOCKTIMEO)) {
1398                 nmp->nm_state |= NFSSTA_LOCKTIMEO;
1399                 mtx_unlock(&nmp->nm_mtx);
1400                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1401                     VQ_NOTRESPLOCK, 0);
1402         } else
1403                 mtx_unlock(&nmp->nm_mtx);
1404         nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, error);
1405 }
1406
1407 static void
1408 nfs_up(struct nfsmount *nmp, struct thread *td, const char *msg,
1409     int flags, int tprintfmsg)
1410 {
1411         if (nmp == NULL)
1412                 return;
1413         if (tprintfmsg) {
1414                 nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, 0);
1415         }
1416
1417         mtx_lock(&nmp->nm_mtx);
1418         if ((flags & NFSSTA_TIMEO) && (nmp->nm_state & NFSSTA_TIMEO)) {
1419                 nmp->nm_state &= ~NFSSTA_TIMEO;
1420                 mtx_unlock(&nmp->nm_mtx);
1421                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1422                     VQ_NOTRESP, 1);
1423         } else
1424                 mtx_unlock(&nmp->nm_mtx);
1425
1426         mtx_lock(&nmp->nm_mtx);
1427         if ((flags & NFSSTA_LOCKTIMEO) && (nmp->nm_state & NFSSTA_LOCKTIMEO)) {
1428                 nmp->nm_state &= ~NFSSTA_LOCKTIMEO;
1429                 mtx_unlock(&nmp->nm_mtx);
1430                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1431                     VQ_NOTRESPLOCK, 1);
1432         } else
1433                 mtx_unlock(&nmp->nm_mtx);
1434 }
1435