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