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 int             nfs_bufpackets = 4;
 105 static int      nfsrv_gsscallbackson = 0;
 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     struct __rpc_client **clipp)
 172 {
 173         int rcvreserve, sndreserve;
 174         int pktscale, pktscalesav;
 175         struct sockaddr *saddr;
 176         struct ucred *origcred;
 177         CLIENT *client;
 178         struct netconfig *nconf;
 179         struct socket *so;
 180         int one = 1, retries, error = 0;
 181         struct thread *td = curthread;
 182         SVCXPRT *xprt;
 183         struct timeval timo;
 184         uint64_t tval;
 185
 186         /*
 187          * We need to establish the socket using the credentials of
 188          * the mountpoint.  Some parts of this process (such as
 189          * sobind() and soconnect()) will use the curent thread's
 190          * credential instead of the socket credential.  To work
 191          * around this, temporarily change the current thread's
 192          * credential to that of the mountpoint.
 193          *
 194          * XXX: It would be better to explicitly pass the correct
 195          * credential to sobind() and soconnect().
 196          */
 197         origcred = td->td_ucred;
 198
 199         /*
 200          * Use the credential in nr_cred, if not NULL.
 201          */
 202         if (nrp->nr_cred != NULL)
 203                 td->td_ucred = nrp->nr_cred;
 204         else
 205                 td->td_ucred = cred;
 206         saddr = nrp->nr_nam;
 207
 208         if (saddr->sa_family == AF_INET)
 209                 if (nrp->nr_sotype == SOCK_DGRAM)
 210                         nconf = getnetconfigent("udp");
 211                 else
 212                         nconf = getnetconfigent("tcp");
 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 != 0)
 239                 goto out;
 240         do {
 241             if (error != 0 && pktscale > 2) {
 242                 if (nmp != NULL && nrp->nr_sotype == SOCK_STREAM &&
 243                     pktscale == pktscalesav) {
 244                     /*
 245                      * Suggest vfs.nfs.bufpackets * maximum RPC message,
 246                      * adjusted for the sb_max->sb_max_adj conversion of
 247                      * MCLBYTES / (MSIZE + MCLBYTES) as the minimum setting
 248                      * for kern.ipc.maxsockbuf.
 249                      */
 250                     tval = (NFS_MAXBSIZE + NFS_MAXXDR) * nfs_bufpackets;
 251                     tval *= MSIZE + MCLBYTES;
 252                     tval += MCLBYTES - 1; /* Round up divide by MCLBYTES. */
 253                     tval /= MCLBYTES;
 254                     printf("Consider increasing kern.ipc.maxsockbuf to a "
 255                         "minimum of %ju to support %ubyte NFS I/O\n",
 256                         (uintmax_t)tval, NFS_MAXBSIZE);
 257                 }
 258                 pktscale--;
 259             }
 260             if (nrp->nr_sotype == SOCK_DGRAM) {
 261                 if (nmp != NULL) {
 262                         sndreserve = (NFS_MAXDGRAMDATA + NFS_MAXPKTHDR) *
 263                             pktscale;
 264                         rcvreserve = (NFS_MAXDGRAMDATA + NFS_MAXPKTHDR) *
 265                             pktscale;
 266                 } else {
 267                         sndreserve = rcvreserve = 1024 * pktscale;
 268                 }
 269             } else {
 270                 if (nrp->nr_sotype != SOCK_STREAM)
 271                         panic("nfscon sotype");
 272                 if (nmp != NULL) {
 273                         sndreserve = (NFS_MAXBSIZE + NFS_MAXXDR) *
 274                             pktscale;
 275                         rcvreserve = (NFS_MAXBSIZE + NFS_MAXXDR) *
 276                             pktscale;
 277                 } else {
 278                         sndreserve = rcvreserve = 1024 * pktscale;
 279                 }
 280             }
 281             error = soreserve(so, sndreserve, rcvreserve);
 282             if (error != 0 && nmp != NULL && nrp->nr_sotype == SOCK_STREAM &&
 283                 pktscale <= 2)
 284                 printf("Must increase kern.ipc.maxsockbuf or reduce"
 285                     " rsize, wsize\n");
 286         } while (error != 0 && pktscale > 2);
 287         soclose(so);
 288         if (error != 0)
 289                 goto out;
 290
 291         client = clnt_reconnect_create(nconf, saddr, nrp->nr_prog,
 292             nrp->nr_vers, sndreserve, rcvreserve);
 293         CLNT_CONTROL(client, CLSET_WAITCHAN, "nfsreq");
 294         if (nmp != NULL) {
 295                 if ((nmp->nm_flag & NFSMNT_INT))
 296                         CLNT_CONTROL(client, CLSET_INTERRUPTIBLE, &one);
 297                 if ((nmp->nm_flag & NFSMNT_RESVPORT))
 298                         CLNT_CONTROL(client, CLSET_PRIVPORT, &one);
 299                 if (NFSHASTLS(nmp)) {
 300                         CLNT_CONTROL(client, CLSET_TLS, &one);
 301                         if (nmp->nm_tlscertname != NULL)
 302                                 CLNT_CONTROL(client, CLSET_TLSCERTNAME,
 303                                     nmp->nm_tlscertname);
 304                 }
 305                 if (NFSHASSOFT(nmp)) {
 306                         if (nmp->nm_sotype == SOCK_DGRAM)
 307                                 /*
 308                                  * For UDP, the large timeout for a reconnect
 309                                  * will be set to "nm_retry * nm_timeo / 2", so
 310                                  * we only want to do 2 reconnect timeout
 311                                  * retries.
 312                                  */
 313                                 retries = 2;
 314                         else
 315                                 retries = nmp->nm_retry;
 316                 } else
 317                         retries = INT_MAX;
 318                 if (NFSHASNFSV4N(nmp)) {
 319                         if (cred != NULL) {
 320                                 if (NFSHASSOFT(nmp)) {
 321                                         /*
 322                                          * This should be a DS mount.
 323                                          * Use CLSET_TIMEOUT to set the timeout
 324                                          * for connections to DSs instead of
 325                                          * specifying a timeout on each RPC.
 326                                          * This is done so that SO_SNDTIMEO
 327                                          * is set on the TCP socket as well
 328                                          * as specifying a time limit when
 329                                          * waiting for an RPC reply.  Useful
 330                                          * if the send queue for the TCP
 331                                          * connection has become constipated,
 332                                          * due to a failed DS.
 333                                          * The choice of lease_duration / 4 is
 334                                          * fairly arbitrary, but seems to work
 335                                          * ok, with a lower bound of 10sec.
 336                                          */
 337                                         timo.tv_sec = nfsrv_lease / 4;
 338                                         if (timo.tv_sec < 10)
 339                                                 timo.tv_sec = 10;
 340                                         timo.tv_usec = 0;
 341                                         CLNT_CONTROL(client, CLSET_TIMEOUT,
 342                                             &timo);
 343                                 }
 344                                 /*
 345                                  * Make sure the nfscbd_pool doesn't get
 346                                  * destroyed while doing this.
 347                                  */
 348                                 NFSD_LOCK();
 349                                 if (nfs_numnfscbd > 0) {
 350                                         nfs_numnfscbd++;
 351                                         NFSD_UNLOCK();
 352                                         xprt = svc_vc_create_backchannel(
 353                                             nfscbd_pool);
 354                                         CLNT_CONTROL(client, CLSET_BACKCHANNEL,
 355                                             xprt);
 356                                         NFSD_LOCK();
 357                                         nfs_numnfscbd--;
 358                                         if (nfs_numnfscbd == 0)
 359                                                 wakeup(&nfs_numnfscbd);
 360                                 }
 361                                 NFSD_UNLOCK();
 362                         } else {
 363                                 /*
 364                                  * cred == NULL for a DS connect.
 365                                  * For connects to a DS, set a retry limit
 366                                  * so that failed DSs will be detected.
 367                                  * This is ok for NFSv4.1, since a DS does
 368                                  * not maintain open/lock state and is the
 369                                  * only case where using a "soft" mount is
 370                                  * recommended for NFSv4.
 371                                  * For mounts from the MDS to DS, this is done
 372                                  * via mount options, but that is not the case
 373                                  * here.  The retry limit here can be adjusted
 374                                  * via the sysctl vfs.nfs.dsretries.
 375                                  * See the comment above w.r.t. timeout.
 376                                  */
 377                                 timo.tv_sec = nfsrv_lease / 4;
 378                                 if (timo.tv_sec < 10)
 379                                         timo.tv_sec = 10;
 380                                 timo.tv_usec = 0;
 381                                 CLNT_CONTROL(client, CLSET_TIMEOUT, &timo);
 382                                 retries = nfs_dsretries;
 383                         }
 384                 }
 385         } else {
 386                 /*
 387                  * Three cases:
 388                  * - Null RPC callback to client
 389                  * - Non-Null RPC callback to client, wait a little longer
 390                  * - upcalls to nfsuserd and gssd (clp == NULL)
 391                  */
 392                 if (callback_retry_mult == 0) {
 393                         retries = NFSV4_UPCALLRETRY;
 394                         CLNT_CONTROL(client, CLSET_PRIVPORT, &one);
 395                 } else {
 396                         retries = NFSV4_CALLBACKRETRY * callback_retry_mult;
 397                 }
 398                 if (dotls)
 399                         CLNT_CONTROL(client, CLSET_TLS, &one);
 400         }
 401         CLNT_CONTROL(client, CLSET_RETRIES, &retries);
 402
 403         if (nmp != NULL) {
 404                 /*
 405                  * For UDP, there are 2 timeouts:
 406                  * - CLSET_RETRY_TIMEOUT sets the initial timeout for the timer
 407                  *   that does a retransmit of an RPC request using the same
 408                  *   socket and xid. This is what you normally want to do,
 409                  *   since NFS servers depend on "same xid" for their
 410                  *   Duplicate Request Cache.
 411                  * - timeout specified in CLNT_CALL_MBUF(), which specifies when
 412                  *   retransmits on the same socket should fail and a fresh
 413                  *   socket created. Each of these timeouts counts as one
 414                  *   CLSET_RETRIES as set above.
 415                  * Set the initial retransmit timeout for UDP. This timeout
 416                  * doesn't exist for TCP and the following call just fails,
 417                  * which is ok.
 418                  */
 419                 timo.tv_sec = nmp->nm_timeo / NFS_HZ;
 420                 timo.tv_usec = (nmp->nm_timeo % NFS_HZ) * 1000000 / NFS_HZ;
 421                 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, &timo);
 422         }
 423
 424         /*
 425          * *clipp is &nrp->nr_client or &nm_aconn[nmp->nm_nextaconn].
 426          * The latter case is for additional connections specified by the
 427          * "nconnect" mount option.  nr_mtx etc is used for these additional
 428          * connections, as well as nr_client in the nfssockreq
 429          * structure for the mount.
 430          */
 431         mtx_lock(&nrp->nr_mtx);
 432         if (*clipp != NULL) {
 433                 mtx_unlock(&nrp->nr_mtx);
 434                 /*
 435                  * Someone else already connected.
 436                  */
 437                 CLNT_RELEASE(client);
 438         } else {
 439                 *clipp = client;
 440                 /*
 441                  * Protocols that do not require connections may be optionally
 442                  * left unconnected for servers that reply from a port other
 443                  * than NFS_PORT.
 444                  */
 445                 if (nmp == NULL || (nmp->nm_flag & NFSMNT_NOCONN) == 0) {
 446                         mtx_unlock(&nrp->nr_mtx);
 447                         CLNT_CONTROL(client, CLSET_CONNECT, &one);
 448                 } else
 449                         mtx_unlock(&nrp->nr_mtx);
 450         }
 451
 452 out:
 453         /* Restore current thread's credentials. */
 454         td->td_ucred = origcred;
 455
 456         NFSEXITCODE(error);
 457         return (error);
 458 }
 459
 460 /*
 461  * NFS disconnect. Clean up and unlink.
 462  */
 463 void
 464 newnfs_disconnect(struct nfsmount *nmp, struct nfssockreq *nrp)
 465 {
 466         CLIENT *client, *aconn[NFS_MAXNCONN - 1];
 467         int i;
 468
 469         mtx_lock(&nrp->nr_mtx);
 470         if (nrp->nr_client != NULL) {
 471                 client = nrp->nr_client;
 472                 nrp->nr_client = NULL;
 473                 if (nmp != NULL && nmp->nm_aconnect > 0) {
 474                         for (i = 0; i < nmp->nm_aconnect; i++) {
 475                                 aconn[i] = nmp->nm_aconn[i];
 476                                 nmp->nm_aconn[i] = NULL;
 477                         }
 478                 }
 479                 mtx_unlock(&nrp->nr_mtx);
 480                 rpc_gss_secpurge_call(client);
 481                 CLNT_CLOSE(client);
 482                 CLNT_RELEASE(client);
 483                 if (nmp != NULL && nmp->nm_aconnect > 0) {
 484                         for (i = 0; i < nmp->nm_aconnect; i++) {
 485                                 if (aconn[i] != NULL) {
 486                                         rpc_gss_secpurge_call(aconn[i]);
 487                                         CLNT_CLOSE(aconn[i]);
 488                                         CLNT_RELEASE(aconn[i]);
 489                                 }
 490                         }
 491                 }
 492         } else {
 493                 mtx_unlock(&nrp->nr_mtx);
 494         }
 495 }
 496
 497 static AUTH *
 498 nfs_getauth(struct nfssockreq *nrp, int secflavour, char *clnt_principal,
 499     char *srv_principal, gss_OID mech_oid, struct ucred *cred)
 500 {
 501         rpc_gss_service_t svc;
 502         AUTH *auth;
 503
 504         switch (secflavour) {
 505         case RPCSEC_GSS_KRB5:
 506         case RPCSEC_GSS_KRB5I:
 507         case RPCSEC_GSS_KRB5P:
 508                 if (!mech_oid) {
 509                         if (!rpc_gss_mech_to_oid_call("kerberosv5", &mech_oid))
 510                                 return (NULL);
 511                 }
 512                 if (secflavour == RPCSEC_GSS_KRB5)
 513                         svc = rpc_gss_svc_none;
 514                 else if (secflavour == RPCSEC_GSS_KRB5I)
 515                         svc = rpc_gss_svc_integrity;
 516                 else
 517                         svc = rpc_gss_svc_privacy;
 518
 519                 if (clnt_principal == NULL)
 520                         auth = rpc_gss_secfind_call(nrp->nr_client, cred,
 521                             srv_principal, mech_oid, svc);
 522                 else {
 523                         auth = rpc_gss_seccreate_call(nrp->nr_client, cred,
 524                             clnt_principal, srv_principal, "kerberosv5",
 525                             svc, NULL, NULL, NULL);
 526                         return (auth);
 527                 }
 528                 if (auth != NULL)
 529                         return (auth);
 530                 /* fallthrough */
 531         case AUTH_SYS:
 532         default:
 533                 return (authunix_create(cred));
 534         }
 535 }
 536
 537 /*
 538  * Callback from the RPC code to generate up/down notifications.
 539  */
 540
 541 struct nfs_feedback_arg {
 542         struct nfsmount *nf_mount;
 543         int             nf_lastmsg;     /* last tprintf */
 544         int             nf_tprintfmsg;
 545         struct thread   *nf_td;
 546 };
 547
 548 static void
 549 nfs_feedback(int type, int proc, void *arg)
 550 {
 551         struct nfs_feedback_arg *nf = (struct nfs_feedback_arg *) arg;
 552         struct nfsmount *nmp = nf->nf_mount;
 553         time_t now;
 554
 555         switch (type) {
 556         case FEEDBACK_REXMIT2:
 557         case FEEDBACK_RECONNECT:
 558                 now = NFSD_MONOSEC;
 559                 if (nf->nf_lastmsg + nmp->nm_tprintf_delay < now) {
 560                         nfs_down(nmp, nf->nf_td,
 561                             "not responding", 0, NFSSTA_TIMEO);
 562                         nf->nf_tprintfmsg = TRUE;
 563                         nf->nf_lastmsg = now;
 564                 }
 565                 break;
 566
 567         case FEEDBACK_OK:
 568                 nfs_up(nf->nf_mount, nf->nf_td,
 569                     "is alive again", NFSSTA_TIMEO, nf->nf_tprintfmsg);
 570                 break;
 571         }
 572 }
 573
 574 /*
 575  * newnfs_request - goes something like this
 576  *      - does the rpc by calling the krpc layer
 577  *      - break down rpc header and return with nfs reply
 578  * nb: always frees up nd_mreq mbuf list
 579  */
 580 int
 581 newnfs_request(struct nfsrv_descript *nd, struct nfsmount *nmp,
 582     struct nfsclient *clp, struct nfssockreq *nrp, vnode_t vp,
 583     struct thread *td, struct ucred *cred, u_int32_t prog, u_int32_t vers,
 584     u_char *retsum, int toplevel, u_int64_t *xidp, struct nfsclsession *dssep)
 585 {
 586         uint32_t retseq, retval, slotseq, *tl;
 587         time_t waituntil;
 588         int i = 0, j = 0, opcnt, set_sigset = 0, slot;
 589         int error = 0, usegssname = 0, secflavour = AUTH_SYS;
 590         int freeslot, maxslot, reterr, slotpos, timeo;
 591         u_int16_t procnum;
 592         u_int nextconn, trylater_delay = 1;
 593         struct nfs_feedback_arg nf;
 594         struct timeval timo;
 595         AUTH *auth;
 596         struct rpc_callextra ext;
 597         enum clnt_stat stat;
 598         struct nfsreq *rep = NULL;
 599         char *srv_principal = NULL, *clnt_principal = NULL;
 600         sigset_t oldset;
 601         struct ucred *authcred;
 602         struct nfsclsession *sep;
 603         uint8_t sessionid[NFSX_V4SESSIONID];
 604         bool nextconn_set;
 605
 606         sep = dssep;
 607         if (xidp != NULL)
 608                 *xidp = 0;
 609         /* Reject requests while attempting a forced unmount. */
 610         if (nmp != NULL && NFSCL_FORCEDISM(nmp->nm_mountp)) {
 611                 m_freem(nd->nd_mreq);
 612                 return (ESTALE);
 613         }
 614
 615         /*
 616          * Set authcred, which is used to acquire RPC credentials to
 617          * the cred argument, by default. The crhold() should not be
 618          * necessary, but will ensure that some future code change
 619          * doesn't result in the credential being free'd prematurely.
 620          */
 621         authcred = crhold(cred);
 622
 623         /* For client side interruptible mounts, mask off the signals. */
 624         if (nmp != NULL && td != NULL && NFSHASINT(nmp)) {
 625                 newnfs_set_sigmask(td, &oldset);
 626                 set_sigset = 1;
 627         }
 628
 629         /*
 630          * If not already connected call newnfs_connect now.
 631          */
 632         if (nrp->nr_client == NULL)
 633                 newnfs_connect(nmp, nrp, cred, td, 0, false, &nrp->nr_client);
 634
 635         nextconn_set = false;
 636         if (nmp != NULL && nmp->nm_aconnect > 0 &&
 637             (nd->nd_procnum == NFSPROC_READ ||
 638              nd->nd_procnum == NFSPROC_READDIR ||
 639              nd->nd_procnum == NFSPROC_READDIRPLUS ||
 640              nd->nd_procnum == NFSPROC_WRITE)) {
 641                 nextconn = atomic_fetchadd_int(&nmp->nm_nextaconn, 1);
 642                 nextconn %= nmp->nm_aconnect;
 643                 nextconn_set = true;
 644                 if (nmp->nm_aconn[nextconn] == NULL)
 645                         newnfs_connect(nmp, nrp, cred, td, 0, false,
 646                             &nmp->nm_aconn[nextconn]);
 647         }
 648
 649         /*
 650          * For a client side mount, nmp is != NULL and clp == NULL. For
 651          * server calls (callbacks or upcalls), nmp == NULL.
 652          */
 653         if (clp != NULL) {
 654                 NFSLOCKSTATE();
 655                 if ((clp->lc_flags & LCL_GSS) && nfsrv_gsscallbackson) {
 656                         secflavour = RPCSEC_GSS_KRB5;
 657                         if (nd->nd_procnum != NFSPROC_NULL) {
 658                                 if (clp->lc_flags & LCL_GSSINTEGRITY)
 659                                         secflavour = RPCSEC_GSS_KRB5I;
 660                                 else if (clp->lc_flags & LCL_GSSPRIVACY)
 661                                         secflavour = RPCSEC_GSS_KRB5P;
 662                         }
 663                 }
 664                 NFSUNLOCKSTATE();
 665         } else if (nmp != NULL && NFSHASKERB(nmp) &&
 666              nd->nd_procnum != NFSPROC_NULL) {
 667                 if (NFSHASALLGSSNAME(nmp) && nmp->nm_krbnamelen > 0)
 668                         nd->nd_flag |= ND_USEGSSNAME;
 669                 if ((nd->nd_flag & ND_USEGSSNAME) != 0) {
 670                         /*
 671                          * If there is a client side host based credential,
 672                          * use that, otherwise use the system uid, if set.
 673                          * The system uid is in the nmp->nm_sockreq.nr_cred
 674                          * credentials.
 675                          */
 676                         if (nmp->nm_krbnamelen > 0) {
 677                                 usegssname = 1;
 678                                 clnt_principal = nmp->nm_krbname;
 679                         } else if (nmp->nm_uid != (uid_t)-1) {
 680                                 KASSERT(nmp->nm_sockreq.nr_cred != NULL,
 681                                     ("newnfs_request: NULL nr_cred"));
 682                                 crfree(authcred);
 683                                 authcred = crhold(nmp->nm_sockreq.nr_cred);
 684                         }
 685                 } else if (nmp->nm_krbnamelen == 0 &&
 686                     nmp->nm_uid != (uid_t)-1 && cred->cr_uid == (uid_t)0) {
 687                         /*
 688                          * If there is no host based principal name and
 689                          * the system uid is set and this is root, use the
 690                          * system uid, since root won't have user
 691                          * credentials in a credentials cache file.
 692                          * The system uid is in the nmp->nm_sockreq.nr_cred
 693                          * credentials.
 694                          */
 695                         KASSERT(nmp->nm_sockreq.nr_cred != NULL,
 696                             ("newnfs_request: NULL nr_cred"));
 697                         crfree(authcred);
 698                         authcred = crhold(nmp->nm_sockreq.nr_cred);
 699                 }
 700                 if (NFSHASINTEGRITY(nmp))
 701                         secflavour = RPCSEC_GSS_KRB5I;
 702                 else if (NFSHASPRIVACY(nmp))
 703                         secflavour = RPCSEC_GSS_KRB5P;
 704                 else
 705                         secflavour = RPCSEC_GSS_KRB5;
 706                 srv_principal = NFSMNT_SRVKRBNAME(nmp);
 707         } else if (nmp != NULL && !NFSHASKERB(nmp) &&
 708             nd->nd_procnum != NFSPROC_NULL &&
 709             (nd->nd_flag & ND_USEGSSNAME) != 0) {
 710                 /*
 711                  * Use the uid that did the mount when the RPC is doing
 712                  * NFSv4 system operations, as indicated by the
 713                  * ND_USEGSSNAME flag, for the AUTH_SYS case.
 714                  * The credentials in nm_sockreq.nr_cred were used for the
 715                  * mount.
 716                  */
 717                 KASSERT(nmp->nm_sockreq.nr_cred != NULL,
 718                     ("newnfs_request: NULL nr_cred"));
 719                 crfree(authcred);
 720                 authcred = crhold(nmp->nm_sockreq.nr_cred);
 721         }
 722
 723         if (nmp != NULL) {
 724                 bzero(&nf, sizeof(struct nfs_feedback_arg));
 725                 nf.nf_mount = nmp;
 726                 nf.nf_td = td;
 727                 nf.nf_lastmsg = NFSD_MONOSEC -
 728                     ((nmp->nm_tprintf_delay)-(nmp->nm_tprintf_initial_delay));
 729         }
 730
 731         if (nd->nd_procnum == NFSPROC_NULL)
 732                 auth = authnone_create();
 733         else if (usegssname) {
 734                 /*
 735                  * For this case, the authenticator is held in the
 736                  * nfssockreq structure, so don't release the reference count
 737                  * held on it. --> Don't AUTH_DESTROY() it in this function.
 738                  */
 739                 if (nrp->nr_auth == NULL)
 740                         nrp->nr_auth = nfs_getauth(nrp, secflavour,
 741                             clnt_principal, srv_principal, NULL, authcred);
 742                 else
 743                         rpc_gss_refresh_auth_call(nrp->nr_auth);
 744                 auth = nrp->nr_auth;
 745         } else
 746                 auth = nfs_getauth(nrp, secflavour, NULL,
 747                     srv_principal, NULL, authcred);
 748         crfree(authcred);
 749         if (auth == NULL) {
 750                 m_freem(nd->nd_mreq);
 751                 if (set_sigset)
 752                         newnfs_restore_sigmask(td, &oldset);
 753                 return (EACCES);
 754         }
 755         bzero(&ext, sizeof(ext));
 756         ext.rc_auth = auth;
 757         if (nmp != NULL) {
 758                 ext.rc_feedback = nfs_feedback;
 759                 ext.rc_feedback_arg = &nf;
 760         }
 761
 762         procnum = nd->nd_procnum;
 763         if ((nd->nd_flag & ND_NFSV4) &&
 764             nd->nd_procnum != NFSPROC_NULL &&
 765             nd->nd_procnum != NFSV4PROC_CBCOMPOUND)
 766                 procnum = NFSV4PROC_COMPOUND;
 767
 768         if (nmp != NULL) {
 769                 NFSINCRGLOBAL(nfsstatsv1.rpcrequests);
 770
 771                 /* Map the procnum to the old NFSv2 one, as required. */
 772                 if ((nd->nd_flag & ND_NFSV2) != 0) {
 773                         if (nd->nd_procnum < NFS_V3NPROCS)
 774                                 procnum = nfsv2_procid[nd->nd_procnum];
 775                         else
 776                                 procnum = NFSV2PROC_NOOP;
 777                 }
 778
 779                 /*
 780                  * Now only used for the R_DONTRECOVER case, but until that is
 781                  * supported within the krpc code, I need to keep a queue of
 782                  * outstanding RPCs for nfsv4 client requests.
 783                  */
 784                 if ((nd->nd_flag & ND_NFSV4) && procnum == NFSV4PROC_COMPOUND)
 785                         rep = malloc(sizeof(struct nfsreq),
 786                             M_NFSDREQ, M_WAITOK);
 787 #ifdef KDTRACE_HOOKS
 788                 if (dtrace_nfscl_nfs234_start_probe != NULL) {
 789                         uint32_t probe_id;
 790                         int probe_procnum;
 791
 792                         if (nd->nd_flag & ND_NFSV4) {
 793                                 probe_id =
 794                                     nfscl_nfs4_start_probes[nd->nd_procnum];
 795                                 probe_procnum = nd->nd_procnum;
 796                         } else if (nd->nd_flag & ND_NFSV3) {
 797                                 probe_id = nfscl_nfs3_start_probes[procnum];
 798                                 probe_procnum = procnum;
 799                         } else {
 800                                 probe_id =
 801                                     nfscl_nfs2_start_probes[nd->nd_procnum];
 802                                 probe_procnum = procnum;
 803                         }
 804                         if (probe_id != 0)
 805                                 (dtrace_nfscl_nfs234_start_probe)
 806                                     (probe_id, vp, nd->nd_mreq, cred,
 807                                      probe_procnum);
 808                 }
 809 #endif
 810         }
 811         freeslot = -1;          /* Set to slot that needs to be free'd */
 812 tryagain:
 813         slot = -1;              /* Slot that needs a sequence# increment. */
 814         /*
 815          * This timeout specifies when a new socket should be created,
 816          * along with new xid values. For UDP, this should be done
 817          * infrequently, since retransmits of RPC requests should normally
 818          * use the same xid.
 819          */
 820         if (nmp == NULL) {
 821                 if (clp == NULL) {
 822                         timo.tv_sec = NFSV4_UPCALLTIMEO;
 823                         timo.tv_usec = 0;
 824                 } else {
 825                         timo.tv_sec = NFSV4_CALLBACKTIMEO / 1000;
 826                         timo.tv_usec = NFSV4_CALLBACKTIMEO * 1000;
 827                 }
 828         } else {
 829                 if (nrp->nr_sotype != SOCK_DGRAM) {
 830                         timo.tv_usec = 0;
 831                         if ((nmp->nm_flag & NFSMNT_NFSV4))
 832                                 timo.tv_sec = INT_MAX;
 833                         else
 834                                 timo.tv_sec = NFS_TCPTIMEO;
 835                 } else {
 836                         if (NFSHASSOFT(nmp)) {
 837                                 /*
 838                                  * CLSET_RETRIES is set to 2, so this should be
 839                                  * half of the total timeout required.
 840                                  */
 841                                 timeo = nmp->nm_retry * nmp->nm_timeo / 2;
 842                                 if (timeo < 1)
 843                                         timeo = 1;
 844                                 timo.tv_sec = timeo / NFS_HZ;
 845                                 timo.tv_usec = (timeo % NFS_HZ) * 1000000 /
 846                                     NFS_HZ;
 847                         } else {
 848                                 /* For UDP hard mounts, use a large value. */
 849                                 timo.tv_sec = NFS_MAXTIMEO / NFS_HZ;
 850                                 timo.tv_usec = 0;
 851                         }
 852                 }
 853
 854                 if (rep != NULL) {
 855                         rep->r_flags = 0;
 856                         rep->r_nmp = nmp;
 857                         /*
 858                          * Chain request into list of outstanding requests.
 859                          */
 860                         NFSLOCKREQ();
 861                         TAILQ_INSERT_TAIL(&nfsd_reqq, rep, r_chain);
 862                         NFSUNLOCKREQ();
 863                 }
 864         }
 865
 866         nd->nd_mrep = NULL;
 867         if (clp != NULL && sep != NULL)
 868                 stat = clnt_bck_call(nrp->nr_client, &ext, procnum,
 869                     nd->nd_mreq, &nd->nd_mrep, timo, sep->nfsess_xprt);
 870         else if (nextconn_set)
 871                 /*
 872                  * When there are multiple TCP connections, send the
 873                  * RPCs with large messages on the alternate TCP
 874                  * connection(s) in a round robin fashion.
 875                  * The small RPC messages are sent on the default
 876                  * TCP connection because they do not require much
 877                  * network bandwidth and separating them from the
 878                  * large RPC messages avoids them getting "log jammed"
 879                  * behind several large RPC messages.
 880                  */
 881                 stat = CLNT_CALL_MBUF(nmp->nm_aconn[nextconn],
 882                     &ext, procnum, nd->nd_mreq, &nd->nd_mrep, timo);
 883         else
 884                 stat = CLNT_CALL_MBUF(nrp->nr_client, &ext, procnum,
 885                     nd->nd_mreq, &nd->nd_mrep, timo);
 886         NFSCL_DEBUG(2, "clnt call=%d\n", stat);
 887
 888         if (rep != NULL) {
 889                 /*
 890                  * RPC done, unlink the request.
 891                  */
 892                 NFSLOCKREQ();
 893                 TAILQ_REMOVE(&nfsd_reqq, rep, r_chain);
 894                 NFSUNLOCKREQ();
 895         }
 896
 897         /*
 898          * If there was a successful reply and a tprintf msg.
 899          * tprintf a response.
 900          */
 901         if (stat == RPC_SUCCESS) {
 902                 error = 0;
 903         } else if (stat == RPC_TIMEDOUT) {
 904                 NFSINCRGLOBAL(nfsstatsv1.rpctimeouts);
 905                 error = ETIMEDOUT;
 906         } else if (stat == RPC_VERSMISMATCH) {
 907                 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
 908                 error = EOPNOTSUPP;
 909         } else if (stat == RPC_PROGVERSMISMATCH) {
 910                 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
 911                 error = EPROTONOSUPPORT;
 912         } else if (stat == RPC_INTR) {
 913                 error = EINTR;
 914         } else if (stat == RPC_CANTSEND || stat == RPC_CANTRECV ||
 915              stat == RPC_SYSTEMERROR) {
 916                 /* Check for a session slot that needs to be free'd. */
 917                 if ((nd->nd_flag & (ND_NFSV41 | ND_HASSLOTID)) ==
 918                     (ND_NFSV41 | ND_HASSLOTID) && nmp != NULL &&
 919                     nd->nd_procnum != NFSPROC_NULL) {
 920                         /*
 921                          * This should only occur when either the MDS or
 922                          * a client has an RPC against a DS fail.
 923                          * This happens because these cases use "soft"
 924                          * connections that can time out and fail.
 925                          * The slot used for this RPC is now in a
 926                          * non-deterministic state, but if the slot isn't
 927                          * free'd, threads can get stuck waiting for a slot.
 928                          */
 929                         if (sep == NULL)
 930                                 sep = nfsmnt_mdssession(nmp);
 931                         /*
 932                          * Bump the sequence# out of range, so that reuse of
 933                          * this slot will result in an NFSERR_SEQMISORDERED
 934                          * error and not a bogus cached RPC reply.
 935                          */
 936                         mtx_lock(&sep->nfsess_mtx);
 937                         sep->nfsess_slotseq[nd->nd_slotid] += 10;
 938                         mtx_unlock(&sep->nfsess_mtx);
 939                         /* And free the slot. */
 940                         nfsv4_freeslot(sep, nd->nd_slotid, false);
 941                 }
 942                 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
 943                 error = ENXIO;
 944         } else {
 945                 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
 946                 error = EACCES;
 947         }
 948         if (error) {
 949                 m_freem(nd->nd_mreq);
 950                 if (usegssname == 0)
 951                         AUTH_DESTROY(auth);
 952                 if (rep != NULL)
 953                         free(rep, M_NFSDREQ);
 954                 if (set_sigset)
 955                         newnfs_restore_sigmask(td, &oldset);
 956                 return (error);
 957         }
 958
 959         KASSERT(nd->nd_mrep != NULL, ("mrep shouldn't be NULL if no error\n"));
 960
 961         /*
 962          * Search for any mbufs that are not a multiple of 4 bytes long
 963          * or with m_data not longword aligned.
 964          * These could cause pointer alignment problems, so copy them to
 965          * well aligned mbufs.
 966          */
 967         newnfs_realign(&nd->nd_mrep, M_WAITOK);
 968         nd->nd_md = nd->nd_mrep;
 969         nd->nd_dpos = mtod(nd->nd_md, caddr_t);
 970         nd->nd_repstat = 0;
 971         if (nd->nd_procnum != NFSPROC_NULL &&
 972             nd->nd_procnum != NFSV4PROC_CBNULL) {
 973                 /* If sep == NULL, set it to the default in nmp. */
 974                 if (sep == NULL && nmp != NULL)
 975                         sep = nfsmnt_mdssession(nmp);
 976                 /*
 977                  * and now the actual NFS xdr.
 978                  */
 979                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 980                 nd->nd_repstat = fxdr_unsigned(u_int32_t, *tl);
 981                 if (nd->nd_repstat >= 10000)
 982                         NFSCL_DEBUG(1, "proc=%d reps=%d\n", (int)nd->nd_procnum,
 983                             (int)nd->nd_repstat);
 984
 985                 /*
 986                  * Get rid of the tag, return count and SEQUENCE result for
 987                  * NFSv4.
 988                  */
 989                 if ((nd->nd_flag & ND_NFSV4) != 0 && nd->nd_repstat !=
 990                     NFSERR_MINORVERMISMATCH) {
 991                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
 992                         i = fxdr_unsigned(int, *tl);
 993                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
 994                         if (error)
 995                                 goto nfsmout;
 996                         NFSM_DISSECT(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
 997                         opcnt = fxdr_unsigned(int, *tl++);
 998                         i = fxdr_unsigned(int, *tl++);
 999                         j = fxdr_unsigned(int, *tl);
1000                         if (j >= 10000)
1001                                 NFSCL_DEBUG(1, "fop=%d fst=%d\n", i, j);
1002                         /*
1003                          * If the first op is Sequence, free up the slot.
1004                          */
1005                         if ((nmp != NULL && i == NFSV4OP_SEQUENCE && j != 0) ||
1006                             (clp != NULL && i == NFSV4OP_CBSEQUENCE && j != 0))
1007                                 NFSCL_DEBUG(1, "failed seq=%d\n", j);
1008                         if (((nmp != NULL && i == NFSV4OP_SEQUENCE && j == 0) ||
1009                             (clp != NULL && i == NFSV4OP_CBSEQUENCE &&
1010                             j == 0)) && sep != NULL) {
1011                                 if (i == NFSV4OP_SEQUENCE)
1012                                         NFSM_DISSECT(tl, uint32_t *,
1013                                             NFSX_V4SESSIONID +
1014                                             5 * NFSX_UNSIGNED);
1015                                 else
1016                                         NFSM_DISSECT(tl, uint32_t *,
1017                                             NFSX_V4SESSIONID +
1018                                             4 * NFSX_UNSIGNED);
1019                                 mtx_lock(&sep->nfsess_mtx);
1020                                 if (bcmp(tl, sep->nfsess_sessionid,
1021                                     NFSX_V4SESSIONID) == 0) {
1022                                         tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
1023                                         retseq = fxdr_unsigned(uint32_t, *tl++);
1024                                         slot = fxdr_unsigned(int, *tl++);
1025                                         freeslot = slot;
1026                                         if (retseq != sep->nfsess_slotseq[slot])
1027                                                 printf("retseq diff 0x%x\n",
1028                                                     retseq);
1029                                         retval = fxdr_unsigned(uint32_t, *++tl);
1030                                         if ((retval + 1) < sep->nfsess_foreslots
1031                                             )
1032                                                 sep->nfsess_foreslots = (retval
1033                                                     + 1);
1034                                         else if ((retval + 1) >
1035                                             sep->nfsess_foreslots)
1036                                                 sep->nfsess_foreslots = (retval
1037                                                     < 64) ? (retval + 1) : 64;
1038                                 }
1039                                 mtx_unlock(&sep->nfsess_mtx);
1040
1041                                 /* Grab the op and status for the next one. */
1042                                 if (opcnt > 1) {
1043                                         NFSM_DISSECT(tl, uint32_t *,
1044                                             2 * NFSX_UNSIGNED);
1045                                         i = fxdr_unsigned(int, *tl++);
1046                                         j = fxdr_unsigned(int, *tl);
1047                                 }
1048                         }
1049                 }
1050                 if (nd->nd_repstat != 0) {
1051                         if (nd->nd_repstat == NFSERR_BADSESSION &&
1052                             nmp != NULL && dssep == NULL &&
1053                             (nd->nd_flag & ND_NFSV41) != 0) {
1054                                 /*
1055                                  * If this is a client side MDS RPC, mark
1056                                  * the MDS session defunct and initiate
1057                                  * recovery, as required.
1058                                  * The nfsess_defunct field is protected by
1059                                  * the NFSLOCKMNT()/nm_mtx lock and not the
1060                                  * nfsess_mtx lock to simplify its handling,
1061                                  * for the MDS session. This lock is also
1062                                  * sufficient for nfsess_sessionid, since it
1063                                  * never changes in the structure.
1064                                  */
1065                                 NFSCL_DEBUG(1, "Got badsession\n");
1066                                 NFSLOCKCLSTATE();
1067                                 NFSLOCKMNT(nmp);
1068                                 sep = NFSMNT_MDSSESSION(nmp);
1069                                 if (bcmp(sep->nfsess_sessionid, nd->nd_sequence,
1070                                     NFSX_V4SESSIONID) == 0) {
1071                                         /* Initiate recovery. */
1072                                         sep->nfsess_defunct = 1;
1073                                         NFSCL_DEBUG(1, "Marked defunct\n");
1074                                         if (nmp->nm_clp != NULL) {
1075                                                 nmp->nm_clp->nfsc_flags |=
1076                                                     NFSCLFLAGS_RECOVER;
1077                                                 wakeup(nmp->nm_clp);
1078                                         }
1079                                 }
1080                                 NFSUNLOCKCLSTATE();
1081                                 /*
1082                                  * Sleep for up to 1sec waiting for a new
1083                                  * session.
1084                                  */
1085                                 mtx_sleep(&nmp->nm_sess, &nmp->nm_mtx, PZERO,
1086                                     "nfsbadsess", hz);
1087                                 /*
1088                                  * Get the session again, in case a new one
1089                                  * has been created during the sleep.
1090                                  */
1091                                 sep = NFSMNT_MDSSESSION(nmp);
1092                                 NFSUNLOCKMNT(nmp);
1093                                 if ((nd->nd_flag & ND_LOOPBADSESS) != 0) {
1094                                         reterr = nfsv4_sequencelookup(nmp, sep,
1095                                             &slotpos, &maxslot, &slotseq,
1096                                             sessionid);
1097                                         if (reterr == 0) {
1098                                                 /* Fill in new session info. */
1099                                                 NFSCL_DEBUG(1,
1100                                                   "Filling in new sequence\n");
1101                                                 tl = nd->nd_sequence;
1102                                                 bcopy(sessionid, tl,
1103                                                     NFSX_V4SESSIONID);
1104                                                 tl += NFSX_V4SESSIONID /
1105                                                     NFSX_UNSIGNED;
1106                                                 *tl++ = txdr_unsigned(slotseq);
1107                                                 *tl++ = txdr_unsigned(slotpos);
1108                                                 *tl = txdr_unsigned(maxslot);
1109                                         }
1110                                         if (reterr == NFSERR_BADSESSION ||
1111                                             reterr == 0) {
1112                                                 NFSCL_DEBUG(1,
1113                                                     "Badsession looping\n");
1114                                                 m_freem(nd->nd_mrep);
1115                                                 nd->nd_mrep = NULL;
1116                                                 goto tryagain;
1117                                         }
1118                                         nd->nd_repstat = reterr;
1119                                         NFSCL_DEBUG(1, "Got err=%d\n", reterr);
1120                                 }
1121                         }
1122                         /*
1123                          * When clp != NULL, it is a callback and all
1124                          * callback operations can be retried for NFSERR_DELAY.
1125                          */
1126                         if (((nd->nd_repstat == NFSERR_DELAY ||
1127                               nd->nd_repstat == NFSERR_GRACE) &&
1128                              (nd->nd_flag & ND_NFSV4) && (clp != NULL ||
1129                              (nd->nd_procnum != NFSPROC_DELEGRETURN &&
1130                              nd->nd_procnum != NFSPROC_SETATTR &&
1131                              nd->nd_procnum != NFSPROC_READ &&
1132                              nd->nd_procnum != NFSPROC_READDS &&
1133                              nd->nd_procnum != NFSPROC_WRITE &&
1134                              nd->nd_procnum != NFSPROC_WRITEDS &&
1135                              nd->nd_procnum != NFSPROC_OPEN &&
1136                              nd->nd_procnum != NFSPROC_OPENLAYGET &&
1137                              nd->nd_procnum != NFSPROC_CREATE &&
1138                              nd->nd_procnum != NFSPROC_CREATELAYGET &&
1139                              nd->nd_procnum != NFSPROC_OPENCONFIRM &&
1140                              nd->nd_procnum != NFSPROC_OPENDOWNGRADE &&
1141                              nd->nd_procnum != NFSPROC_CLOSE &&
1142                              nd->nd_procnum != NFSPROC_LOCK &&
1143                              nd->nd_procnum != NFSPROC_LOCKU))) ||
1144                             (nd->nd_repstat == NFSERR_DELAY &&
1145                              (nd->nd_flag & ND_NFSV4) == 0) ||
1146                             nd->nd_repstat == NFSERR_RESOURCE) {
1147                                 if (trylater_delay > NFS_TRYLATERDEL)
1148                                         trylater_delay = NFS_TRYLATERDEL;
1149                                 waituntil = NFSD_MONOSEC + trylater_delay;
1150                                 while (NFSD_MONOSEC < waituntil)
1151                                         (void) nfs_catnap(PZERO, 0, "nfstry");
1152                                 trylater_delay *= 2;
1153                                 if (slot != -1) {
1154                                         mtx_lock(&sep->nfsess_mtx);
1155                                         sep->nfsess_slotseq[slot]++;
1156                                         *nd->nd_slotseq = txdr_unsigned(
1157                                             sep->nfsess_slotseq[slot]);
1158                                         mtx_unlock(&sep->nfsess_mtx);
1159                                 }
1160                                 m_freem(nd->nd_mrep);
1161                                 nd->nd_mrep = NULL;
1162                                 goto tryagain;
1163                         }
1164
1165                         /*
1166                          * If the File Handle was stale, invalidate the
1167                          * lookup cache, just in case.
1168                          * (vp != NULL implies a client side call)
1169                          */
1170                         if (nd->nd_repstat == ESTALE && vp != NULL) {
1171                                 cache_purge(vp);
1172                                 if (ncl_call_invalcaches != NULL)
1173                                         (*ncl_call_invalcaches)(vp);
1174                         }
1175                 }
1176                 if ((nd->nd_flag & ND_NFSV4) != 0) {
1177                         /* Free the slot, as required. */
1178                         if (freeslot != -1)
1179                                 nfsv4_freeslot(sep, freeslot, false);
1180                         /*
1181                          * If this op is Putfh, throw its results away.
1182                          */
1183                         if (j >= 10000)
1184                                 NFSCL_DEBUG(1, "nop=%d nst=%d\n", i, j);
1185                         if (nmp != NULL && i == NFSV4OP_PUTFH && j == 0) {
1186                                 NFSM_DISSECT(tl,u_int32_t *,2 * NFSX_UNSIGNED);
1187                                 i = fxdr_unsigned(int, *tl++);
1188                                 j = fxdr_unsigned(int, *tl);
1189                                 if (j >= 10000)
1190                                         NFSCL_DEBUG(1, "n2op=%d n2st=%d\n", i,
1191                                             j);
1192                                 /*
1193                                  * All Compounds that do an Op that must
1194                                  * be in sequence consist of NFSV4OP_PUTFH
1195                                  * followed by one of these. As such, we
1196                                  * can determine if the seqid# should be
1197                                  * incremented, here.
1198                                  */
1199                                 if ((i == NFSV4OP_OPEN ||
1200                                      i == NFSV4OP_OPENCONFIRM ||
1201                                      i == NFSV4OP_OPENDOWNGRADE ||
1202                                      i == NFSV4OP_CLOSE ||
1203                                      i == NFSV4OP_LOCK ||
1204                                      i == NFSV4OP_LOCKU) &&
1205                                     (j == 0 ||
1206                                      (j != NFSERR_STALECLIENTID &&
1207                                       j != NFSERR_STALESTATEID &&
1208                                       j != NFSERR_BADSTATEID &&
1209                                       j != NFSERR_BADSEQID &&
1210                                       j != NFSERR_BADXDR &&
1211                                       j != NFSERR_RESOURCE &&
1212                                       j != NFSERR_NOFILEHANDLE)))
1213                                         nd->nd_flag |= ND_INCRSEQID;
1214                         }
1215                         /*
1216                          * If this op's status is non-zero, mark
1217                          * that there is no more data to process.
1218                          * The exception is Setattr, which always has xdr
1219                          * when it has failed.
1220                          */
1221                         if (j != 0 && i != NFSV4OP_SETATTR)
1222                                 nd->nd_flag |= ND_NOMOREDATA;
1223
1224                         /*
1225                          * If R_DONTRECOVER is set, replace the stale error
1226                          * reply, so that recovery isn't initiated.
1227                          */
1228                         if ((nd->nd_repstat == NFSERR_STALECLIENTID ||
1229                              nd->nd_repstat == NFSERR_BADSESSION ||
1230                              nd->nd_repstat == NFSERR_STALESTATEID) &&
1231                             rep != NULL && (rep->r_flags & R_DONTRECOVER))
1232                                 nd->nd_repstat = NFSERR_STALEDONTRECOVER;
1233                 }
1234         }
1235
1236 #ifdef KDTRACE_HOOKS
1237         if (nmp != NULL && dtrace_nfscl_nfs234_done_probe != NULL) {
1238                 uint32_t probe_id;
1239                 int probe_procnum;
1240
1241                 if (nd->nd_flag & ND_NFSV4) {
1242                         probe_id = nfscl_nfs4_done_probes[nd->nd_procnum];
1243                         probe_procnum = nd->nd_procnum;
1244                 } else if (nd->nd_flag & ND_NFSV3) {
1245                         probe_id = nfscl_nfs3_done_probes[procnum];
1246                         probe_procnum = procnum;
1247                 } else {
1248                         probe_id = nfscl_nfs2_done_probes[nd->nd_procnum];
1249                         probe_procnum = procnum;
1250                 }
1251                 if (probe_id != 0)
1252                         (dtrace_nfscl_nfs234_done_probe)(probe_id, vp,
1253                             nd->nd_mreq, cred, probe_procnum, 0);
1254         }
1255 #endif
1256
1257         m_freem(nd->nd_mreq);
1258         if (usegssname == 0)
1259                 AUTH_DESTROY(auth);
1260         if (rep != NULL)
1261                 free(rep, M_NFSDREQ);
1262         if (set_sigset)
1263                 newnfs_restore_sigmask(td, &oldset);
1264         return (0);
1265 nfsmout:
1266         m_freem(nd->nd_mrep);
1267         m_freem(nd->nd_mreq);
1268         if (usegssname == 0)
1269                 AUTH_DESTROY(auth);
1270         if (rep != NULL)
1271                 free(rep, M_NFSDREQ);
1272         if (set_sigset)
1273                 newnfs_restore_sigmask(td, &oldset);
1274         return (error);
1275 }
1276
1277 /*
1278  * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
1279  * wait for all requests to complete. This is used by forced unmounts
1280  * to terminate any outstanding RPCs.
1281  */
1282 int
1283 newnfs_nmcancelreqs(struct nfsmount *nmp)
1284 {
1285         struct nfsclds *dsp;
1286         struct __rpc_client *cl;
1287
1288         if (nmp->nm_sockreq.nr_client != NULL)
1289                 CLNT_CLOSE(nmp->nm_sockreq.nr_client);
1290 lookformore:
1291         NFSLOCKMNT(nmp);
1292         TAILQ_FOREACH(dsp, &nmp->nm_sess, nfsclds_list) {
1293                 NFSLOCKDS(dsp);
1294                 if (dsp != TAILQ_FIRST(&nmp->nm_sess) &&
1295                     (dsp->nfsclds_flags & NFSCLDS_CLOSED) == 0 &&
1296                     dsp->nfsclds_sockp != NULL &&
1297                     dsp->nfsclds_sockp->nr_client != NULL) {
1298                         dsp->nfsclds_flags |= NFSCLDS_CLOSED;
1299                         cl = dsp->nfsclds_sockp->nr_client;
1300                         NFSUNLOCKDS(dsp);
1301                         NFSUNLOCKMNT(nmp);
1302                         CLNT_CLOSE(cl);
1303                         goto lookformore;
1304                 }
1305                 NFSUNLOCKDS(dsp);
1306         }
1307         NFSUNLOCKMNT(nmp);
1308         return (0);
1309 }
1310
1311 /*
1312  * Any signal that can interrupt an NFS operation in an intr mount
1313  * should be added to this set. SIGSTOP and SIGKILL cannot be masked.
1314  */
1315 int newnfs_sig_set[] = {
1316         SIGINT,
1317         SIGTERM,
1318         SIGHUP,
1319         SIGKILL,
1320         SIGQUIT
1321 };
1322
1323 /*
1324  * Check to see if one of the signals in our subset is pending on
1325  * the process (in an intr mount).
1326  */
1327 static int
1328 nfs_sig_pending(sigset_t set)
1329 {
1330         int i;
1331
1332         for (i = 0 ; i < nitems(newnfs_sig_set); i++)
1333                 if (SIGISMEMBER(set, newnfs_sig_set[i]))
1334                         return (1);
1335         return (0);
1336 }
1337
1338 /*
1339  * The set/restore sigmask functions are used to (temporarily) overwrite
1340  * the thread td_sigmask during an RPC call (for example). These are also
1341  * used in other places in the NFS client that might tsleep().
1342  */
1343 void
1344 newnfs_set_sigmask(struct thread *td, sigset_t *oldset)
1345 {
1346         sigset_t newset;
1347         int i;
1348         struct proc *p;
1349
1350         SIGFILLSET(newset);
1351         if (td == NULL)
1352                 td = curthread; /* XXX */
1353         p = td->td_proc;
1354         /* Remove the NFS set of signals from newset */
1355         PROC_LOCK(p);
1356         mtx_lock(&p->p_sigacts->ps_mtx);
1357         for (i = 0 ; i < nitems(newnfs_sig_set); i++) {
1358                 /*
1359                  * But make sure we leave the ones already masked
1360                  * by the process, ie. remove the signal from the
1361                  * temporary signalmask only if it wasn't already
1362                  * in p_sigmask.
1363                  */
1364                 if (!SIGISMEMBER(td->td_sigmask, newnfs_sig_set[i]) &&
1365                     !SIGISMEMBER(p->p_sigacts->ps_sigignore, newnfs_sig_set[i]))
1366                         SIGDELSET(newset, newnfs_sig_set[i]);
1367         }
1368         mtx_unlock(&p->p_sigacts->ps_mtx);
1369         kern_sigprocmask(td, SIG_SETMASK, &newset, oldset,
1370             SIGPROCMASK_PROC_LOCKED);
1371         PROC_UNLOCK(p);
1372 }
1373
1374 void
1375 newnfs_restore_sigmask(struct thread *td, sigset_t *set)
1376 {
1377         if (td == NULL)
1378                 td = curthread; /* XXX */
1379         kern_sigprocmask(td, SIG_SETMASK, set, NULL, 0);
1380 }
1381
1382 /*
1383  * NFS wrapper to msleep(), that shoves a new p_sigmask and restores the
1384  * old one after msleep() returns.
1385  */
1386 int
1387 newnfs_msleep(struct thread *td, void *ident, struct mtx *mtx, int priority, char *wmesg, int timo)
1388 {
1389         sigset_t oldset;
1390         int error;
1391
1392         if ((priority & PCATCH) == 0)
1393                 return msleep(ident, mtx, priority, wmesg, timo);
1394         if (td == NULL)
1395                 td = curthread; /* XXX */
1396         newnfs_set_sigmask(td, &oldset);
1397         error = msleep(ident, mtx, priority, wmesg, timo);
1398         newnfs_restore_sigmask(td, &oldset);
1399         return (error);
1400 }
1401
1402 /*
1403  * Test for a termination condition pending on the process.
1404  * This is used for NFSMNT_INT mounts.
1405  */
1406 int
1407 newnfs_sigintr(struct nfsmount *nmp, struct thread *td)
1408 {
1409         struct proc *p;
1410         sigset_t tmpset;
1411
1412         /* Terminate all requests while attempting a forced unmount. */
1413         if (NFSCL_FORCEDISM(nmp->nm_mountp))
1414                 return (EIO);
1415         if (!(nmp->nm_flag & NFSMNT_INT))
1416                 return (0);
1417         if (td == NULL)
1418                 return (0);
1419         p = td->td_proc;
1420         PROC_LOCK(p);
1421         tmpset = p->p_siglist;
1422         SIGSETOR(tmpset, td->td_siglist);
1423         SIGSETNAND(tmpset, td->td_sigmask);
1424         mtx_lock(&p->p_sigacts->ps_mtx);
1425         SIGSETNAND(tmpset, p->p_sigacts->ps_sigignore);
1426         mtx_unlock(&p->p_sigacts->ps_mtx);
1427         if ((SIGNOTEMPTY(p->p_siglist) || SIGNOTEMPTY(td->td_siglist))
1428             && nfs_sig_pending(tmpset)) {
1429                 PROC_UNLOCK(p);
1430                 return (EINTR);
1431         }
1432         PROC_UNLOCK(p);
1433         return (0);
1434 }
1435
1436 static int
1437 nfs_msg(struct thread *td, const char *server, const char *msg, int error)
1438 {
1439         struct proc *p;
1440
1441         p = td ? td->td_proc : NULL;
1442         if (error) {
1443                 tprintf(p, LOG_INFO, "nfs server %s: %s, error %d\n",
1444                     server, msg, error);
1445         } else {
1446                 tprintf(p, LOG_INFO, "nfs server %s: %s\n", server, msg);
1447         }
1448         return (0);
1449 }
1450
1451 static void
1452 nfs_down(struct nfsmount *nmp, struct thread *td, const char *msg,
1453     int error, int flags)
1454 {
1455         if (nmp == NULL)
1456                 return;
1457         mtx_lock(&nmp->nm_mtx);
1458         if ((flags & NFSSTA_TIMEO) && !(nmp->nm_state & NFSSTA_TIMEO)) {
1459                 nmp->nm_state |= NFSSTA_TIMEO;
1460                 mtx_unlock(&nmp->nm_mtx);
1461                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1462                     VQ_NOTRESP, 0);
1463         } else
1464                 mtx_unlock(&nmp->nm_mtx);
1465         mtx_lock(&nmp->nm_mtx);
1466         if ((flags & NFSSTA_LOCKTIMEO) && !(nmp->nm_state & NFSSTA_LOCKTIMEO)) {
1467                 nmp->nm_state |= NFSSTA_LOCKTIMEO;
1468                 mtx_unlock(&nmp->nm_mtx);
1469                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1470                     VQ_NOTRESPLOCK, 0);
1471         } else
1472                 mtx_unlock(&nmp->nm_mtx);
1473         nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, error);
1474 }
1475
1476 static void
1477 nfs_up(struct nfsmount *nmp, struct thread *td, const char *msg,
1478     int flags, int tprintfmsg)
1479 {
1480         if (nmp == NULL)
1481                 return;
1482         if (tprintfmsg) {
1483                 nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, 0);
1484         }
1485
1486         mtx_lock(&nmp->nm_mtx);
1487         if ((flags & NFSSTA_TIMEO) && (nmp->nm_state & NFSSTA_TIMEO)) {
1488                 nmp->nm_state &= ~NFSSTA_TIMEO;
1489                 mtx_unlock(&nmp->nm_mtx);
1490                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1491                     VQ_NOTRESP, 1);
1492         } else
1493                 mtx_unlock(&nmp->nm_mtx);
1494
1495         mtx_lock(&nmp->nm_mtx);
1496         if ((flags & NFSSTA_LOCKTIMEO) && (nmp->nm_state & NFSSTA_LOCKTIMEO)) {
1497                 nmp->nm_state &= ~NFSSTA_LOCKTIMEO;
1498                 mtx_unlock(&nmp->nm_mtx);
1499                 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1500                     VQ_NOTRESPLOCK, 1);
1501         } else
1502                 mtx_unlock(&nmp->nm_mtx);
1503 }