sys/nfsserver/nfs_syscalls.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Rick Macklem at The University of Guelph.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)nfs_syscalls.c      8.5 (Berkeley) 3/30/95
  37  * $FreeBSD$
  38  */
  39
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD$");
  42
  43 #include "opt_inet6.h"
  44
  45 #include <sys/param.h>
  46 #include <sys/systm.h>
  47 #include <sys/sysproto.h>
  48 #include <sys/kernel.h>
  49 #include <sys/sysctl.h>
  50 #include <sys/file.h>
  51 #include <sys/filedesc.h>
  52 #include <sys/vnode.h>
  53 #include <sys/malloc.h>
  54 #include <sys/mount.h>
  55 #include <sys/proc.h>
  56 #include <sys/bio.h>
  57 #include <sys/buf.h>
  58 #include <sys/mbuf.h>
  59 #include <sys/socket.h>
  60 #include <sys/socketvar.h>
  61 #include <sys/domain.h>
  62 #include <sys/protosw.h>
  63 #include <sys/namei.h>
  64 #include <sys/fcntl.h>
  65 #include <sys/lockf.h>
  66
  67 #include <netinet/in.h>
  68 #include <netinet/tcp.h>
  69 #ifdef INET6
  70 #include <net/if.h>
  71 #include <netinet6/in6_var.h>
  72 #endif
  73 #include <nfs/xdr_subs.h>
  74 #include <nfs/rpcv2.h>
  75 #include <nfs/nfsproto.h>
  76 #include <nfsserver/nfs.h>
  77 #include <nfsserver/nfsm_subs.h>
  78 #include <nfsserver/nfsrvcache.h>
  79
  80 static MALLOC_DEFINE(M_NFSSVC, "NFS srvsock", "Nfs server structure");
  81
  82 MALLOC_DEFINE(M_NFSRVDESC, "NFSV3 srvdesc", "NFS server socket descriptor");
  83 MALLOC_DEFINE(M_NFSD, "NFS daemon", "Nfs server daemon structure");
  84
  85
  86 #define TRUE    1
  87 #define FALSE   0
  88
  89 SYSCTL_DECL(_vfs_nfsrv);
  90
  91 int             nfsd_waiting = 0;
  92 static int      nfs_numnfsd = 0;
  93 static int      notstarted = 1;
  94
  95 static int      nfs_privport = 0;
  96 SYSCTL_INT(_vfs_nfsrv, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW,
  97             &nfs_privport, 0, "");
  98 SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay, CTLFLAG_RW,
  99             &nfsrvw_procrastinate, 0, "");
 100 SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay_v3, CTLFLAG_RW,
 101             &nfsrvw_procrastinate_v3, 0, "");
 102
 103 static int      nfssvc_addsock(struct file *, struct sockaddr *,
 104                     struct thread *);
 105 static void     nfsrv_zapsock(struct nfssvc_sock *slp);
 106 static int      nfssvc_nfsd(struct thread *);
 107
 108 /*
 109  * NFS server system calls
 110  */
 111
 112 /*
 113  * Nfs server psuedo system call for the nfsd's
 114  * Based on the flag value it either:
 115  * - adds a socket to the selection list
 116  * - remains in the kernel as an nfsd
 117  * - remains in the kernel as an nfsiod
 118  * For INET6 we suppose that nfsd provides only IN6P_IPV6_V6ONLY sockets
 119  * and that mountd provides
 120  *  - sockaddr with no IPv4-mapped addresses
 121  *  - mask for both INET and INET6 families if there is IPv4-mapped overlap
 122  */
 123 #ifndef _SYS_SYSPROTO_H_
 124 struct nfssvc_args {
 125         int flag;
 126         caddr_t argp;
 127 };
 128 #endif
 129 /*
 130  * MPSAFE
 131  */
 132 int
 133 nfssvc(struct thread *td, struct nfssvc_args *uap)
 134 {
 135         struct file *fp;
 136         struct sockaddr *nam;
 137         struct nfsd_args nfsdarg;
 138         int error;
 139
 140         mtx_lock(&Giant);
 141         error = suser(td);
 142         if (error)
 143                 goto done2;
 144         while (nfssvc_sockhead_flag & SLP_INIT) {
 145                  nfssvc_sockhead_flag |= SLP_WANTINIT;
 146                 (void) tsleep((caddr_t)&nfssvc_sockhead, PSOCK, "nfsd init", 0);
 147         }
 148         if (uap->flag & NFSSVC_ADDSOCK) {
 149                 error = copyin(uap->argp, (caddr_t)&nfsdarg, sizeof(nfsdarg));
 150                 if (error)
 151                         goto done2;
 152                 if ((error = fget(td, nfsdarg.sock, &fp)) != 0)
 153                         goto done2;
 154                 if (fp->f_type != DTYPE_SOCKET) {
 155                         fdrop(fp, td);
 156                         goto done2;
 157                 }
 158                 /*
 159                  * Get the client address for connected sockets.
 160                  */
 161                 if (nfsdarg.name == NULL || nfsdarg.namelen == 0)
 162                         nam = NULL;
 163                 else {
 164                         error = getsockaddr(&nam, nfsdarg.name,
 165                                             nfsdarg.namelen);
 166                         if (error) {
 167                                 fdrop(fp, td);
 168                                 goto done2;
 169                         }
 170                 }
 171                 error = nfssvc_addsock(fp, nam, td);
 172                 fdrop(fp, td);
 173         } else if (uap->flag & NFSSVC_NFSD) {
 174                 error = nfssvc_nfsd(td);
 175         } else {
 176                 error = ENXIO;
 177         }
 178         if (error == EINTR || error == ERESTART)
 179                 error = 0;
 180 done2:
 181         mtx_unlock(&Giant);
 182         return (error);
 183 }
 184
 185 /*
 186  * Adds a socket to the list for servicing by nfsds.
 187  */
 188 static int
 189 nfssvc_addsock(struct file *fp, struct sockaddr *mynam, struct thread *td)
 190 {
 191         int siz;
 192         struct nfssvc_sock *slp;
 193         struct socket *so;
 194         int error, s;
 195
 196         so = (struct socket *)fp->f_data;
 197 #if 0
 198         tslp = NULL;
 199         /*
 200          * Add it to the list, as required.
 201          */
 202         if (so->so_proto->pr_protocol == IPPROTO_UDP) {
 203                 tslp = nfs_udpsock;
 204                 if (tslp->ns_flag & SLP_VALID) {
 205                         if (mynam != NULL)
 206                                 FREE(mynam, M_SONAME);
 207                         return (EPERM);
 208                 }
 209         }
 210 #endif
 211         if (so->so_type == SOCK_STREAM)
 212                 siz = NFS_MAXPACKET + sizeof (u_long);
 213         else
 214                 siz = NFS_MAXPACKET;
 215         error = soreserve(so, siz, siz);
 216         if (error) {
 217                 if (mynam != NULL)
 218                         FREE(mynam, M_SONAME);
 219                 return (error);
 220         }
 221
 222         /*
 223          * Set protocol specific options { for now TCP only } and
 224          * reserve some space. For datagram sockets, this can get called
 225          * repeatedly for the same socket, but that isn't harmful.
 226          */
 227         if (so->so_type == SOCK_STREAM) {
 228                 struct sockopt sopt;
 229                 int val;
 230
 231                 bzero(&sopt, sizeof sopt);
 232                 sopt.sopt_level = SOL_SOCKET;
 233                 sopt.sopt_name = SO_KEEPALIVE;
 234                 sopt.sopt_val = &val;
 235                 sopt.sopt_valsize = sizeof val;
 236                 val = 1;
 237                 sosetopt(so, &sopt);
 238         }
 239         if (so->so_proto->pr_protocol == IPPROTO_TCP) {
 240                 struct sockopt sopt;
 241                 int val;
 242
 243                 bzero(&sopt, sizeof sopt);
 244                 sopt.sopt_level = IPPROTO_TCP;
 245                 sopt.sopt_name = TCP_NODELAY;
 246                 sopt.sopt_val = &val;
 247                 sopt.sopt_valsize = sizeof val;
 248                 val = 1;
 249                 sosetopt(so, &sopt);
 250         }
 251         so->so_rcv.sb_flags &= ~SB_NOINTR;
 252         so->so_rcv.sb_timeo = 0;
 253         so->so_snd.sb_flags &= ~SB_NOINTR;
 254         so->so_snd.sb_timeo = 0;
 255
 256         slp = (struct nfssvc_sock *)
 257                 malloc(sizeof (struct nfssvc_sock), M_NFSSVC,
 258                 M_WAITOK | M_ZERO);
 259         STAILQ_INIT(&slp->ns_rec);
 260         TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain);
 261
 262         slp->ns_so = so;
 263         slp->ns_nam = mynam;
 264         fp->f_count++;
 265         slp->ns_fp = fp;
 266         s = splnet();
 267         so->so_upcallarg = (caddr_t)slp;
 268         so->so_upcall = nfsrv_rcv;
 269         so->so_rcv.sb_flags |= SB_UPCALL;
 270         slp->ns_flag = (SLP_VALID | SLP_NEEDQ);
 271         nfsrv_wakenfsd(slp);
 272         splx(s);
 273         return (0);
 274 }
 275
 276 /*
 277  * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
 278  * until it is killed by a signal.
 279  */
 280 static int
 281 nfssvc_nfsd(struct thread *td)
 282 {
 283         int siz;
 284         struct nfssvc_sock *slp;
 285         struct nfsd *nfsd;
 286         struct nfsrv_descript *nd = NULL;
 287         struct mbuf *m, *mreq;
 288         int error = 0, cacherep, s, sotype, writes_todo;
 289         int procrastinate;
 290         u_quad_t cur_usec;
 291
 292 #ifndef nolint
 293         cacherep = RC_DOIT;
 294         writes_todo = 0;
 295 #endif
 296         nfsd = (struct nfsd *)
 297                 malloc(sizeof (struct nfsd), M_NFSD, M_WAITOK | M_ZERO);
 298         s = splnet();
 299         nfsd->nfsd_td = td;
 300         TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain);
 301         nfs_numnfsd++;
 302
 303         /*
 304          * Loop getting rpc requests until SIGKILL.
 305          */
 306         for (;;) {
 307                 if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) {
 308                         while (nfsd->nfsd_slp == NULL &&
 309                             (nfsd_head_flag & NFSD_CHECKSLP) == 0) {
 310                                 nfsd->nfsd_flag |= NFSD_WAITING;
 311                                 nfsd_waiting++;
 312                                 error = tsleep((caddr_t)nfsd, PSOCK | PCATCH,
 313                                     "nfsd", 0);
 314                                 nfsd_waiting--;
 315                                 if (error)
 316                                         goto done;
 317                         }
 318                         if (nfsd->nfsd_slp == NULL &&
 319                             (nfsd_head_flag & NFSD_CHECKSLP) != 0) {
 320                                 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) {
 321                                     if ((slp->ns_flag & (SLP_VALID | SLP_DOREC))
 322                                         == (SLP_VALID | SLP_DOREC)) {
 323                                             slp->ns_flag &= ~SLP_DOREC;
 324                                             slp->ns_sref++;
 325                                             nfsd->nfsd_slp = slp;
 326                                             break;
 327                                     }
 328                                 }
 329                                 if (slp == 0)
 330                                         nfsd_head_flag &= ~NFSD_CHECKSLP;
 331                         }
 332                         if ((slp = nfsd->nfsd_slp) == NULL)
 333                                 continue;
 334                         if (slp->ns_flag & SLP_VALID) {
 335                                 if (slp->ns_flag & SLP_DISCONN)
 336                                         nfsrv_zapsock(slp);
 337                                 else if (slp->ns_flag & SLP_NEEDQ) {
 338                                         slp->ns_flag &= ~SLP_NEEDQ;
 339                                         (void) nfs_slplock(slp, 1);
 340                                         nfsrv_rcv(slp->ns_so, (caddr_t)slp,
 341                                                 M_TRYWAIT);
 342                                         nfs_slpunlock(slp);
 343                                 }
 344                                 error = nfsrv_dorec(slp, nfsd, &nd);
 345                                 cur_usec = nfs_curusec();
 346                                 if (error && LIST_FIRST(&slp->ns_tq) &&
 347                                     LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) {
 348                                         error = 0;
 349                                         cacherep = RC_DOIT;
 350                                         writes_todo = 1;
 351                                 } else
 352                                         writes_todo = 0;
 353                                 nfsd->nfsd_flag |= NFSD_REQINPROG;
 354                         }
 355                 } else {
 356                         error = 0;
 357                         slp = nfsd->nfsd_slp;
 358                 }
 359                 if (error || (slp->ns_flag & SLP_VALID) == 0) {
 360                         if (nd) {
 361                                 free((caddr_t)nd, M_NFSRVDESC);
 362                                 nd = NULL;
 363                         }
 364                         nfsd->nfsd_slp = NULL;
 365                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
 366                         nfsrv_slpderef(slp);
 367                         continue;
 368                 }
 369                 splx(s);
 370                 sotype = slp->ns_so->so_type;
 371                 if (nd) {
 372                     getmicrotime(&nd->nd_starttime);
 373                     if (nd->nd_nam2)
 374                         nd->nd_nam = nd->nd_nam2;
 375                     else
 376                         nd->nd_nam = slp->ns_nam;
 377
 378                     /*
 379                      * Check to see if authorization is needed.
 380                      */
 381                     cacherep = nfsrv_getcache(nd, &mreq);
 382
 383                     if (nfs_privport) {
 384                         /* Check if source port is privileged */
 385                         u_short port;
 386                         struct sockaddr *nam = nd->nd_nam;
 387                         struct sockaddr_in *sin;
 388
 389                         sin = (struct sockaddr_in *)nam;
 390                         /*
 391                          * INET/INET6 - same code:
 392                          *    sin_port and sin6_port are at same offset
 393                          */
 394                         port = ntohs(sin->sin_port);
 395                         if (port >= IPPORT_RESERVED &&
 396                             nd->nd_procnum != NFSPROC_NULL) {
 397 #if defined(INET6) && defined(KLD_MODULE)
 398         /* do not use ip6_sprintf: the nfs module should work without INET6 */
 399         char b6[INET6_ADDRSTRLEN];
 400 #define ip6_sprintf(a) \
 401          (sprintf(b6, "%x:%x:%x:%x:%x:%x:%x:%x", \
 402                   (a)->s6_addr16[0], (a)->s6_addr16[1], \
 403                   (a)->s6_addr16[2], (a)->s6_addr16[3], \
 404                   (a)->s6_addr16[4], (a)->s6_addr16[5], \
 405                   (a)->s6_addr16[6], (a)->s6_addr16[7]), \
 406           b6)
 407 #endif
 408                             nd->nd_procnum = NFSPROC_NOOP;
 409                             nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
 410                             cacherep = RC_DOIT;
 411                             printf("NFS request from unprivileged port (%s:%d)\n",
 412 #ifdef INET6
 413                                    sin->sin_family == AF_INET6 ?
 414                                         ip6_sprintf(&satosin6(sin)->sin6_addr) :
 415 #undef ip6_sprintf
 416 #endif
 417                                    inet_ntoa(sin->sin_addr), port);
 418                         }
 419                     }
 420
 421                 }
 422
 423                 /*
 424                  * Loop to get all the write rpc relies that have been
 425                  * gathered together.
 426                  */
 427                 do {
 428                     switch (cacherep) {
 429                     case RC_DOIT:
 430                         if (nd && (nd->nd_flag & ND_NFSV3))
 431                             procrastinate = nfsrvw_procrastinate_v3;
 432                         else
 433                             procrastinate = nfsrvw_procrastinate;
 434                         if (writes_todo || (nd->nd_procnum == NFSPROC_WRITE &&
 435                             procrastinate > 0 && !notstarted))
 436                             error = nfsrv_writegather(&nd, slp,
 437                                 nfsd->nfsd_td, &mreq);
 438                         else
 439                             error = (*(nfsrv3_procs[nd->nd_procnum]))(nd,
 440                                 slp, nfsd->nfsd_td, &mreq);
 441                         if (mreq == NULL)
 442                                 break;
 443                         if (error != 0 && error != NFSERR_RETVOID) {
 444                                 nfsrvstats.srv_errs++;
 445                                 nfsrv_updatecache(nd, FALSE, mreq);
 446                                 if (nd->nd_nam2)
 447                                         FREE(nd->nd_nam2, M_SONAME);
 448                                 break;
 449                         }
 450                         nfsrvstats.srvrpccnt[nd->nd_procnum]++;
 451                         nfsrv_updatecache(nd, TRUE, mreq);
 452                         nd->nd_mrep = NULL;
 453                     case RC_REPLY:
 454                         m = mreq;
 455                         siz = 0;
 456                         while (m) {
 457                                 siz += m->m_len;
 458                                 m = m->m_next;
 459                         }
 460                         if (siz <= 0 || siz > NFS_MAXPACKET) {
 461                                 printf("mbuf siz=%d\n",siz);
 462                                 panic("Bad nfs svc reply");
 463                         }
 464                         m = mreq;
 465                         m->m_pkthdr.len = siz;
 466                         m->m_pkthdr.rcvif = NULL;
 467                         /*
 468                          * For stream protocols, prepend a Sun RPC
 469                          * Record Mark.
 470                          */
 471                         if (sotype == SOCK_STREAM) {
 472                                 M_PREPEND(m, NFSX_UNSIGNED, M_TRYWAIT);
 473                                 *mtod(m, u_int32_t *) = htonl(0x80000000 | siz);
 474                         }
 475                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
 476                                 (void) nfs_slplock(slp, 1);
 477                         if (slp->ns_flag & SLP_VALID)
 478                             error = nfsrv_send(slp->ns_so, nd->nd_nam2, m);
 479                         else {
 480                             error = EPIPE;
 481                             m_freem(m);
 482                         }
 483                         if (nd->nd_nam2)
 484                                 FREE(nd->nd_nam2, M_SONAME);
 485                         if (nd->nd_mrep)
 486                                 m_freem(nd->nd_mrep);
 487                         if (error == EPIPE)
 488                                 nfsrv_zapsock(slp);
 489                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
 490                                 nfs_slpunlock(slp);
 491                         if (error == EINTR || error == ERESTART) {
 492                                 free((caddr_t)nd, M_NFSRVDESC);
 493                                 nfsrv_slpderef(slp);
 494                                 s = splnet();
 495                                 goto done;
 496                         }
 497                         break;
 498                     case RC_DROPIT:
 499                         m_freem(nd->nd_mrep);
 500                         if (nd->nd_nam2)
 501                                 FREE(nd->nd_nam2, M_SONAME);
 502                         break;
 503                     };
 504                     if (nd) {
 505                         FREE((caddr_t)nd, M_NFSRVDESC);
 506                         nd = NULL;
 507                     }
 508
 509                     /*
 510                      * Check to see if there are outstanding writes that
 511                      * need to be serviced.
 512                      */
 513                     cur_usec = nfs_curusec();
 514                     s = splsoftclock();
 515                     if (LIST_FIRST(&slp->ns_tq) &&
 516                         LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) {
 517                         cacherep = RC_DOIT;
 518                         writes_todo = 1;
 519                     } else
 520                         writes_todo = 0;
 521                     splx(s);
 522                 } while (writes_todo);
 523                 s = splnet();
 524                 if (nfsrv_dorec(slp, nfsd, &nd)) {
 525                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
 526                         nfsd->nfsd_slp = NULL;
 527                         nfsrv_slpderef(slp);
 528                 }
 529         }
 530 done:
 531         TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain);
 532         splx(s);
 533         free((caddr_t)nfsd, M_NFSD);
 534         if (--nfs_numnfsd == 0)
 535                 nfsrv_init(TRUE);       /* Reinitialize everything */
 536         return (error);
 537 }
 538
 539 /*
 540  * Shut down a socket associated with an nfssvc_sock structure.
 541  * Should be called with the send lock set, if required.
 542  * The trick here is to increment the sref at the start, so that the nfsds
 543  * will stop using it and clear ns_flag at the end so that it will not be
 544  * reassigned during cleanup.
 545  */
 546 static void
 547 nfsrv_zapsock(struct nfssvc_sock *slp)
 548 {
 549         struct nfsrv_descript *nwp, *nnwp;
 550         struct socket *so;
 551         struct file *fp;
 552         struct nfsrv_rec *rec;
 553         int s;
 554
 555         slp->ns_flag &= ~SLP_ALLFLAGS;
 556         fp = slp->ns_fp;
 557         if (fp) {
 558                 slp->ns_fp = NULL;
 559                 so = slp->ns_so;
 560                 so->so_rcv.sb_flags &= ~SB_UPCALL;
 561                 so->so_upcall = NULL;
 562                 so->so_upcallarg = NULL;
 563                 soshutdown(so, 2);
 564                 closef(fp, NULL);
 565                 if (slp->ns_nam)
 566                         FREE(slp->ns_nam, M_SONAME);
 567                 m_freem(slp->ns_raw);
 568                 while ((rec = STAILQ_FIRST(&slp->ns_rec)) != NULL) {
 569                         STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
 570                         if (rec->nr_address)
 571                                 FREE(rec->nr_address, M_SONAME);
 572                         m_freem(rec->nr_packet);
 573                         free(rec, M_NFSRVDESC);
 574                 }
 575                 s = splsoftclock();
 576                 for (nwp = LIST_FIRST(&slp->ns_tq); nwp; nwp = nnwp) {
 577                         nnwp = LIST_NEXT(nwp, nd_tq);
 578                         LIST_REMOVE(nwp, nd_tq);
 579                         free((caddr_t)nwp, M_NFSRVDESC);
 580                 }
 581                 LIST_INIT(&slp->ns_tq);
 582                 splx(s);
 583         }
 584 }
 585
 586 /*
 587  * Derefence a server socket structure. If it has no more references and
 588  * is no longer valid, you can throw it away.
 589  */
 590 void
 591 nfsrv_slpderef(struct nfssvc_sock *slp)
 592 {
 593
 594         if (--(slp->ns_sref) == 0 && (slp->ns_flag & SLP_VALID) == 0) {
 595                 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
 596                 free((caddr_t)slp, M_NFSSVC);
 597         }
 598 }
 599
 600 /*
 601  * Lock a socket against others.
 602  */
 603 int
 604 nfs_slplock(struct nfssvc_sock *slp, int wait)
 605 {
 606         int *statep = &slp->ns_solock;
 607
 608         if (!wait && (*statep & NFSRV_SNDLOCK))
 609                 return(0);      /* already locked, fail */
 610         while (*statep & NFSRV_SNDLOCK) {
 611                 *statep |= NFSRV_WANTSND;
 612                 (void) tsleep((caddr_t)statep, PZERO - 1, "nfsslplck", 0);
 613         }
 614         *statep |= NFSRV_SNDLOCK;
 615         return (1);
 616 }
 617
 618 /*
 619  * Unlock the stream socket for others.
 620  */
 621 void
 622 nfs_slpunlock(struct nfssvc_sock *slp)
 623 {
 624         int *statep = &slp->ns_solock;
 625
 626         if ((*statep & NFSRV_SNDLOCK) == 0)
 627                 panic("nfs slpunlock");
 628         *statep &= ~NFSRV_SNDLOCK;
 629         if (*statep & NFSRV_WANTSND) {
 630                 *statep &= ~NFSRV_WANTSND;
 631                 wakeup((caddr_t)statep);
 632         }
 633 }
 634
 635 /*
 636  * Initialize the data structures for the server.
 637  * Handshake with any new nfsds starting up to avoid any chance of
 638  * corruption.
 639  */
 640 void
 641 nfsrv_init(int terminating)
 642 {
 643         struct nfssvc_sock *slp, *nslp;
 644
 645         if (nfssvc_sockhead_flag & SLP_INIT)
 646                 panic("nfsd init");
 647         nfssvc_sockhead_flag |= SLP_INIT;
 648         if (terminating) {
 649                 for (slp = TAILQ_FIRST(&nfssvc_sockhead); slp != 0; slp = nslp){
 650                         nslp = TAILQ_NEXT(slp, ns_chain);
 651                         if (slp->ns_flag & SLP_VALID)
 652                                 nfsrv_zapsock(slp);
 653                         TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
 654                         free((caddr_t)slp, M_NFSSVC);
 655                 }
 656                 nfsrv_cleancache();     /* And clear out server cache */
 657         } else
 658                 nfs_pub.np_valid = 0;
 659
 660         TAILQ_INIT(&nfssvc_sockhead);
 661         nfssvc_sockhead_flag &= ~SLP_INIT;
 662         if (nfssvc_sockhead_flag & SLP_WANTINIT) {
 663                 nfssvc_sockhead_flag &= ~SLP_WANTINIT;
 664                 wakeup((caddr_t)&nfssvc_sockhead);
 665         }
 666
 667         TAILQ_INIT(&nfsd_head);
 668         nfsd_head_flag &= ~NFSD_CHECKSLP;
 669
 670 #if 0
 671         nfs_udpsock = (struct nfssvc_sock *)
 672             malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
 673         STAILQ_INIT(&nfs_udpsock->ns_rec);
 674         TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain);
 675
 676         nfs_cltpsock = (struct nfssvc_sock *)
 677             malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
 678         STAILQ_INIT(&nfs_cltpsock->ns_rec);
 679         TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain);
 680 #endif
 681 }