sys/fs/nfsserver/nfs_nfsdkrpc.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1989, 1993
   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 #include "opt_inet6.h"
  40 #include "opt_kgssapi.h"
  41 #include "opt_kern_tls.h"
  42
  43 #include <fs/nfs/nfsport.h>
  44
  45 #include <rpc/rpc.h>
  46 #include <rpc/rpcsec_gss.h>
  47 #include <rpc/rpcsec_tls.h>
  48
  49 #include <fs/nfsserver/nfs_fha_new.h>
  50
  51 #include <security/mac/mac_framework.h>
  52
  53 NFSDLOCKMUTEX;
  54 NFSV4ROOTLOCKMUTEX;
  55 struct nfsv4lock nfsd_suspend_lock;
  56 char *nfsrv_zeropnfsdat = NULL;
  57
  58 /*
  59  * Mapping of old NFS Version 2 RPC numbers to generic numbers.
  60  */
  61 int newnfs_nfsv3_procid[NFS_V3NPROCS] = {
  62         NFSPROC_NULL,
  63         NFSPROC_GETATTR,
  64         NFSPROC_SETATTR,
  65         NFSPROC_NOOP,
  66         NFSPROC_LOOKUP,
  67         NFSPROC_READLINK,
  68         NFSPROC_READ,
  69         NFSPROC_NOOP,
  70         NFSPROC_WRITE,
  71         NFSPROC_CREATE,
  72         NFSPROC_REMOVE,
  73         NFSPROC_RENAME,
  74         NFSPROC_LINK,
  75         NFSPROC_SYMLINK,
  76         NFSPROC_MKDIR,
  77         NFSPROC_RMDIR,
  78         NFSPROC_READDIR,
  79         NFSPROC_FSSTAT,
  80         NFSPROC_NOOP,
  81         NFSPROC_NOOP,
  82         NFSPROC_NOOP,
  83         NFSPROC_NOOP,
  84 };
  85
  86 SYSCTL_DECL(_vfs_nfsd);
  87
  88 SVCPOOL         *nfsrvd_pool;
  89
  90 static int      nfs_privport = 0;
  91 SYSCTL_INT(_vfs_nfsd, OID_AUTO, nfs_privport, CTLFLAG_RWTUN,
  92     &nfs_privport, 0,
  93     "Only allow clients using a privileged port for NFSv2, 3 and 4");
  94
  95 static int      nfs_minvers = NFS_VER2;
  96 SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_min_nfsvers, CTLFLAG_RWTUN,
  97     &nfs_minvers, 0, "The lowest version of NFS handled by the server");
  98
  99 static int      nfs_maxvers = NFS_VER4;
 100 SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_max_nfsvers, CTLFLAG_RWTUN,
 101     &nfs_maxvers, 0, "The highest version of NFS handled by the server");
 102
 103 static int nfs_proc(struct nfsrv_descript *, u_int32_t, SVCXPRT *xprt,
 104     struct nfsrvcache **);
 105
 106 extern u_long sb_max_adj;
 107 extern int newnfs_numnfsd;
 108 extern struct proc *nfsd_master_proc;
 109 extern time_t nfsdev_time;
 110 extern int nfsrv_writerpc[NFS_NPROCS];
 111 extern volatile int nfsrv_devidcnt;
 112 extern struct nfsv4_opflag nfsv4_opflag[NFSV42_NOPS];
 113
 114 /*
 115  * NFS server system calls
 116  */
 117
 118 static void
 119 nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
 120 {
 121         struct nfsrv_descript nd;
 122         struct nfsrvcache *rp = NULL;
 123         int cacherep, credflavor;
 124 #ifdef KERN_TLS
 125         u_int maxlen;
 126 #endif
 127
 128         memset(&nd, 0, sizeof(nd));
 129         if (rqst->rq_vers == NFS_VER2) {
 130                 if (rqst->rq_proc > NFSV2PROC_STATFS ||
 131                     newnfs_nfsv3_procid[rqst->rq_proc] == NFSPROC_NOOP) {
 132                         svcerr_noproc(rqst);
 133                         svc_freereq(rqst);
 134                         goto out;
 135                 }
 136                 nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc];
 137                 nd.nd_flag = ND_NFSV2;
 138         } else if (rqst->rq_vers == NFS_VER3) {
 139                 if (rqst->rq_proc >= NFS_V3NPROCS) {
 140                         svcerr_noproc(rqst);
 141                         svc_freereq(rqst);
 142                         goto out;
 143                 }
 144                 nd.nd_procnum = rqst->rq_proc;
 145                 nd.nd_flag = ND_NFSV3;
 146         } else {
 147                 if (rqst->rq_proc != NFSPROC_NULL &&
 148                     rqst->rq_proc != NFSV4PROC_COMPOUND) {
 149                         svcerr_noproc(rqst);
 150                         svc_freereq(rqst);
 151                         goto out;
 152                 }
 153                 nd.nd_procnum = rqst->rq_proc;
 154                 nd.nd_flag = ND_NFSV4;
 155         }
 156
 157         /*
 158          * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
 159          * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
 160          * mounts.
 161          */
 162         nd.nd_mrep = rqst->rq_args;
 163         rqst->rq_args = NULL;
 164         newnfs_realign(&nd.nd_mrep, M_WAITOK);
 165         nd.nd_md = nd.nd_mrep;
 166         nd.nd_dpos = mtod(nd.nd_md, caddr_t);
 167         nd.nd_nam = svc_getrpccaller(rqst);
 168         nd.nd_nam2 = rqst->rq_addr;
 169         nd.nd_mreq = NULL;
 170         nd.nd_cred = NULL;
 171
 172         if (nfs_privport != 0) {
 173                 /* Check if source port is privileged */
 174                 u_short port;
 175                 struct sockaddr *nam = nd.nd_nam;
 176                 struct sockaddr_in *sin;
 177
 178                 sin = (struct sockaddr_in *)nam;
 179                 /*
 180                  * INET/INET6 - same code:
 181                  *    sin_port and sin6_port are at same offset
 182                  */
 183                 port = ntohs(sin->sin_port);
 184                 if (port >= IPPORT_RESERVED &&
 185                     nd.nd_procnum != NFSPROC_NULL) {
 186 #ifdef INET6
 187                         char buf[INET6_ADDRSTRLEN];
 188 #else
 189                         char buf[INET_ADDRSTRLEN];
 190 #endif
 191 #ifdef INET6
 192 #if defined(KLD_MODULE)
 193                         /* Do not use ip6_sprintf: the nfs module should work without INET6. */
 194 #define ip6_sprintf(buf, a)                                             \
 195                         (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x",      \
 196                             (a)->s6_addr16[0], (a)->s6_addr16[1],       \
 197                             (a)->s6_addr16[2], (a)->s6_addr16[3],       \
 198                             (a)->s6_addr16[4], (a)->s6_addr16[5],       \
 199                             (a)->s6_addr16[6], (a)->s6_addr16[7]),      \
 200                             (buf))
 201 #endif
 202 #endif
 203                         printf("NFS request from unprivileged port (%s:%d)\n",
 204 #ifdef INET6
 205                             sin->sin_family == AF_INET6 ?
 206                             ip6_sprintf(buf, &satosin6(sin)->sin6_addr) :
 207 #if defined(KLD_MODULE)
 208 #undef ip6_sprintf
 209 #endif
 210 #endif
 211                             inet_ntoa_r(sin->sin_addr, buf), port);
 212                         svcerr_weakauth(rqst);
 213                         svc_freereq(rqst);
 214                         m_freem(nd.nd_mrep);
 215                         goto out;
 216                 }
 217         }
 218
 219         if (nd.nd_procnum != NFSPROC_NULL) {
 220                 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
 221                         svcerr_weakauth(rqst);
 222                         svc_freereq(rqst);
 223                         m_freem(nd.nd_mrep);
 224                         goto out;
 225                 }
 226
 227                 /* Set the flag based on credflavor */
 228                 if (credflavor == RPCSEC_GSS_KRB5) {
 229                         nd.nd_flag |= ND_GSS;
 230                 } else if (credflavor == RPCSEC_GSS_KRB5I) {
 231                         nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY);
 232                 } else if (credflavor == RPCSEC_GSS_KRB5P) {
 233                         nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY);
 234                 } else if (credflavor != AUTH_SYS) {
 235                         svcerr_weakauth(rqst);
 236                         svc_freereq(rqst);
 237                         m_freem(nd.nd_mrep);
 238                         goto out;
 239                 }
 240
 241                 if ((xprt->xp_tls & RPCTLS_FLAGS_HANDSHAKE) != 0) {
 242                         nd.nd_flag |= ND_TLS;
 243                         if ((xprt->xp_tls & RPCTLS_FLAGS_VERIFIED) != 0)
 244                                 nd.nd_flag |= ND_TLSCERT;
 245                         if ((xprt->xp_tls & RPCTLS_FLAGS_CERTUSER) != 0)
 246                                 nd.nd_flag |= ND_TLSCERTUSER;
 247                 }
 248                 nd.nd_maxextsiz = 16384;
 249 #ifdef MAC
 250                 mac_cred_associate_nfsd(nd.nd_cred);
 251 #endif
 252                 /*
 253                  * Get a refcnt (shared lock) on nfsd_suspend_lock.
 254                  * NFSSVC_SUSPENDNFSD will take an exclusive lock on
 255                  * nfsd_suspend_lock to suspend these threads.
 256                  * The call to nfsv4_lock() that precedes nfsv4_getref()
 257                  * ensures that the acquisition of the exclusive lock
 258                  * takes priority over acquisition of the shared lock by
 259                  * waiting for any exclusive lock request to complete.
 260                  * This must be done here, before the check of
 261                  * nfsv4root exports by nfsvno_v4rootexport().
 262                  */
 263                 NFSLOCKV4ROOTMUTEX();
 264                 nfsv4_lock(&nfsd_suspend_lock, 0, NULL, NFSV4ROOTLOCKMUTEXPTR,
 265                     NULL);
 266                 nfsv4_getref(&nfsd_suspend_lock, NULL, NFSV4ROOTLOCKMUTEXPTR,
 267                     NULL);
 268                 NFSUNLOCKV4ROOTMUTEX();
 269
 270                 if ((nd.nd_flag & ND_NFSV4) != 0) {
 271                         nd.nd_repstat = nfsvno_v4rootexport(&nd);
 272                         if (nd.nd_repstat != 0) {
 273                                 NFSLOCKV4ROOTMUTEX();
 274                                 nfsv4_relref(&nfsd_suspend_lock);
 275                                 NFSUNLOCKV4ROOTMUTEX();
 276                                 svcerr_weakauth(rqst);
 277                                 svc_freereq(rqst);
 278                                 m_freem(nd.nd_mrep);
 279                                 goto out;
 280                         }
 281                 }
 282
 283 #ifdef KERN_TLS
 284                 if ((xprt->xp_tls & RPCTLS_FLAGS_HANDSHAKE) != 0 &&
 285                     rpctls_getinfo(&maxlen, false, false))
 286                         nd.nd_maxextsiz = maxlen;
 287 #endif
 288                 cacherep = nfs_proc(&nd, rqst->rq_xid, xprt, &rp);
 289                 NFSLOCKV4ROOTMUTEX();
 290                 nfsv4_relref(&nfsd_suspend_lock);
 291                 NFSUNLOCKV4ROOTMUTEX();
 292         } else {
 293                 NFSMGET(nd.nd_mreq);
 294                 nd.nd_mreq->m_len = 0;
 295                 cacherep = RC_REPLY;
 296         }
 297         if (nd.nd_mrep != NULL)
 298                 m_freem(nd.nd_mrep);
 299
 300         if (nd.nd_cred != NULL)
 301                 crfree(nd.nd_cred);
 302
 303         if (cacherep == RC_DROPIT) {
 304                 if (nd.nd_mreq != NULL)
 305                         m_freem(nd.nd_mreq);
 306                 svc_freereq(rqst);
 307                 goto out;
 308         }
 309
 310         if (nd.nd_mreq == NULL) {
 311                 svcerr_decode(rqst);
 312                 svc_freereq(rqst);
 313                 goto out;
 314         }
 315
 316         if (nd.nd_repstat & NFSERR_AUTHERR) {
 317                 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
 318                 if (nd.nd_mreq != NULL)
 319                         m_freem(nd.nd_mreq);
 320         } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
 321                 svcerr_systemerr(rqst);
 322         }
 323         if (rp != NULL) {
 324                 nfsrvd_sentcache(rp, (rqst->rq_reply_seq != 0 ||
 325                     SVC_ACK(xprt, NULL)), rqst->rq_reply_seq);
 326         }
 327         svc_freereq(rqst);
 328
 329 out:
 330         td_softdep_cleanup(curthread);
 331         NFSEXITCODE(0);
 332 }
 333
 334 /*
 335  * Check the cache and, optionally, do the RPC.
 336  * Return the appropriate cache response.
 337  */
 338 static int
 339 nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, SVCXPRT *xprt,
 340     struct nfsrvcache **rpp)
 341 {
 342         int cacherep = RC_DOIT, isdgram, taglen = -1;
 343         struct mbuf *m;
 344         u_char tag[NFSV4_SMALLSTR + 1], *tagstr = NULL;
 345         u_int32_t minorvers = 0;
 346         uint32_t ack;
 347
 348         *rpp = NULL;
 349         if (nd->nd_nam2 == NULL) {
 350                 nd->nd_flag |= ND_STREAMSOCK;
 351                 isdgram = 0;
 352         } else {
 353                 isdgram = 1;
 354         }
 355
 356         /*
 357          * Two cases:
 358          * 1 - For NFSv2 over UDP, if we are near our malloc/mget
 359          *     limit, just drop the request. There is no
 360          *     NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the
 361          *     client will timeout/retry over UDP in a little while.
 362          * 2 - nd_repstat == 0 && nd_mreq == NULL, which
 363          *     means a normal nfs rpc, so check the cache
 364          */
 365         if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL &&
 366             nfsrv_mallocmget_limit()) {
 367                 cacherep = RC_DROPIT;
 368         } else {
 369                 /*
 370                  * For NFSv3, play it safe and assume that the client is
 371                  * doing retries on the same TCP connection.
 372                  */
 373                 if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) ==
 374                     ND_STREAMSOCK)
 375                         nd->nd_flag |= ND_SAMETCPCONN;
 376                 nd->nd_retxid = xid;
 377                 nd->nd_tcpconntime = NFSD_MONOSEC;
 378                 nd->nd_sockref = xprt->xp_sockref;
 379                 if ((nd->nd_flag & ND_NFSV4) != 0)
 380                         nfsd_getminorvers(nd, tag, &tagstr, &taglen,
 381                             &minorvers);
 382                 if ((nd->nd_flag & ND_NFSV41) != 0)
 383                         /* NFSv4.1 caches replies in the session slots. */
 384                         cacherep = RC_DOIT;
 385                 else {
 386                         cacherep = nfsrvd_getcache(nd);
 387                         ack = 0;
 388                         SVC_ACK(xprt, &ack);
 389                         nfsrc_trimcache(xprt->xp_sockref, ack, 0);
 390                 }
 391         }
 392
 393         /*
 394          * Handle the request. There are three cases.
 395          * RC_DOIT - do the RPC
 396          * RC_REPLY - return the reply already created
 397          * RC_DROPIT - just throw the request away
 398          */
 399         if (cacherep == RC_DOIT) {
 400                 if ((nd->nd_flag & ND_NFSV41) != 0)
 401                         nd->nd_xprt = xprt;
 402                 nfsrvd_dorpc(nd, isdgram, tagstr, taglen, minorvers);
 403                 if ((nd->nd_flag & ND_NFSV41) != 0) {
 404                         if (nd->nd_repstat != NFSERR_REPLYFROMCACHE &&
 405                             (nd->nd_flag & ND_SAVEREPLY) != 0) {
 406                                 /* Cache a copy of the reply. */
 407                                 m = m_copym(nd->nd_mreq, 0, M_COPYALL,
 408                                     M_WAITOK);
 409                         } else
 410                                 m = NULL;
 411                         if ((nd->nd_flag & ND_HASSEQUENCE) != 0)
 412                                 nfsrv_cache_session(nd, &m);
 413                         if (nd->nd_repstat == NFSERR_REPLYFROMCACHE)
 414                                 nd->nd_repstat = 0;
 415                         cacherep = RC_REPLY;
 416                 } else {
 417                         if (nd->nd_repstat == NFSERR_DONTREPLY)
 418                                 cacherep = RC_DROPIT;
 419                         else
 420                                 cacherep = RC_REPLY;
 421                         *rpp = nfsrvd_updatecache(nd);
 422                 }
 423         }
 424         if (tagstr != NULL && taglen > NFSV4_SMALLSTR)
 425                 free(tagstr, M_TEMP);
 426
 427         NFSEXITCODE2(0, nd);
 428         return (cacherep);
 429 }
 430
 431 static void
 432 nfssvc_loss(SVCXPRT *xprt)
 433 {
 434         uint32_t ack;
 435
 436         ack = 0;
 437         SVC_ACK(xprt, &ack);
 438         nfsrc_trimcache(xprt->xp_sockref, ack, 1);
 439 }
 440
 441 /*
 442  * Adds a socket to the list for servicing by nfsds.
 443  */
 444 int
 445 nfsrvd_addsock(struct file *fp)
 446 {
 447         int siz;
 448         struct socket *so;
 449         int error = 0;
 450         SVCXPRT *xprt;
 451         static u_int64_t sockref = 0;
 452
 453         so = fp->f_data;
 454
 455         siz = sb_max_adj;
 456         error = soreserve(so, siz, siz);
 457         if (error)
 458                 goto out;
 459
 460         /*
 461          * Steal the socket from userland so that it doesn't close
 462          * unexpectedly.
 463          */
 464         if (so->so_type == SOCK_DGRAM)
 465                 xprt = svc_dg_create(nfsrvd_pool, so, 0, 0);
 466         else
 467                 xprt = svc_vc_create(nfsrvd_pool, so, 0, 0);
 468         if (xprt) {
 469                 fp->f_ops = &badfileops;
 470                 fp->f_data = NULL;
 471                 xprt->xp_sockref = ++sockref;
 472                 if (nfs_minvers == NFS_VER2)
 473                         svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program,
 474                             NULL);
 475                 if (nfs_minvers <= NFS_VER3 && nfs_maxvers >= NFS_VER3)
 476                         svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program,
 477                             NULL);
 478                 if (nfs_maxvers >= NFS_VER4)
 479                         svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program,
 480                             NULL);
 481                 if (so->so_type == SOCK_STREAM)
 482                         svc_loss_reg(xprt, nfssvc_loss);
 483                 SVC_RELEASE(xprt);
 484         }
 485
 486 out:
 487         NFSEXITCODE(error);
 488         return (error);
 489 }
 490
 491 /*
 492  * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
 493  * until it is killed by a signal.
 494  */
 495 int
 496 nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
 497 {
 498         char principal[MAXHOSTNAMELEN + 5];
 499         struct proc *p;
 500         int error = 0;
 501         bool_t ret2, ret3, ret4;
 502
 503         error = copyinstr(args->principal, principal, sizeof (principal),
 504             NULL);
 505         if (error)
 506                 goto out;
 507
 508         /*
 509          * Only the first nfsd actually does any work. The RPC code
 510          * adds threads to it as needed. Any extra processes offered
 511          * by nfsd just exit. If nfsd is new enough, it will call us
 512          * once with a structure that specifies how many threads to
 513          * use.
 514          */
 515         NFSD_LOCK();
 516         if (newnfs_numnfsd == 0) {
 517                 nfsdev_time = time_second;
 518                 p = td->td_proc;
 519                 PROC_LOCK(p);
 520                 p->p_flag2 |= P2_AST_SU;
 521                 PROC_UNLOCK(p);
 522                 newnfs_numnfsd++;
 523
 524                 NFSD_UNLOCK();
 525                 error = nfsrv_createdevids(args, td);
 526                 if (error == 0) {
 527                         /* An empty string implies AUTH_SYS only. */
 528                         if (principal[0] != '\0') {
 529                                 ret2 = rpc_gss_set_svc_name_call(principal,
 530                                     "kerberosv5", GSS_C_INDEFINITE, NFS_PROG,
 531                                     NFS_VER2);
 532                                 ret3 = rpc_gss_set_svc_name_call(principal,
 533                                     "kerberosv5", GSS_C_INDEFINITE, NFS_PROG,
 534                                     NFS_VER3);
 535                                 ret4 = rpc_gss_set_svc_name_call(principal,
 536                                     "kerberosv5", GSS_C_INDEFINITE, NFS_PROG,
 537                                     NFS_VER4);
 538
 539                                 if (!ret2 || !ret3 || !ret4)
 540                                         printf(
 541                                             "nfsd: can't register svc name\n");
 542                         }
 543
 544                         nfsrvd_pool->sp_minthreads = args->minthreads;
 545                         nfsrvd_pool->sp_maxthreads = args->maxthreads;
 546
 547                         /*
 548                          * If this is a pNFS service, make Getattr do a
 549                          * vn_start_write(), so it can do a vn_set_extattr().
 550                          */
 551                         if (nfsrv_devidcnt > 0) {
 552                                 nfsrv_writerpc[NFSPROC_GETATTR] = 1;
 553                                 nfsv4_opflag[NFSV4OP_GETATTR].modifyfs = 1;
 554                         }
 555
 556                         svc_run(nfsrvd_pool);
 557
 558                         /* Reset Getattr to not do a vn_start_write(). */
 559                         nfsrv_writerpc[NFSPROC_GETATTR] = 0;
 560                         nfsv4_opflag[NFSV4OP_GETATTR].modifyfs = 0;
 561
 562                         if (principal[0] != '\0') {
 563                                 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2);
 564                                 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3);
 565                                 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER4);
 566                         }
 567                 }
 568                 NFSD_LOCK();
 569                 newnfs_numnfsd--;
 570                 nfsrvd_init(1);
 571                 PROC_LOCK(p);
 572                 p->p_flag2 &= ~P2_AST_SU;
 573                 PROC_UNLOCK(p);
 574         }
 575         NFSD_UNLOCK();
 576
 577 out:
 578         NFSEXITCODE(error);
 579         return (error);
 580 }
 581
 582 /*
 583  * Initialize the data structures for the server.
 584  * Handshake with any new nfsds starting up to avoid any chance of
 585  * corruption.
 586  */
 587 void
 588 nfsrvd_init(int terminating)
 589 {
 590
 591         NFSD_LOCK_ASSERT();
 592
 593         if (terminating) {
 594                 nfsd_master_proc = NULL;
 595                 NFSD_UNLOCK();
 596                 nfsrv_freealllayoutsanddevids();
 597                 nfsrv_freeallbackchannel_xprts();
 598                 svcpool_close(nfsrvd_pool);
 599                 free(nfsrv_zeropnfsdat, M_TEMP);
 600                 nfsrv_zeropnfsdat = NULL;
 601                 NFSD_LOCK();
 602         } else {
 603                 NFSD_UNLOCK();
 604                 nfsrvd_pool = svcpool_create("nfsd",
 605                     SYSCTL_STATIC_CHILDREN(_vfs_nfsd));
 606                 nfsrvd_pool->sp_rcache = NULL;
 607                 nfsrvd_pool->sp_assign = fhanew_assign;
 608                 nfsrvd_pool->sp_done = fhanew_nd_complete;
 609                 NFSD_LOCK();
 610         }
 611 }