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