sys/fs/nfs/nfs_commonkrpc.c

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