sys/vfs/nfs/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: src/sys/nfs/nfs_syscalls.c,v 1.58.2.1 2000/11/26 02:30:06 dillon Exp $
  38  * $DragonFly: src/sys/vfs/nfs/nfs_syscalls.c,v 1.31 2008/01/05 14:02:41 swildner Exp $
  39  */
  40
  41 #include <sys/param.h>
  42 #include <sys/systm.h>
  43 #include <sys/sysproto.h>
  44 #include <sys/kernel.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/file.h>
  47 #include <sys/filedesc.h>
  48 #include <sys/vnode.h>
  49 #include <sys/malloc.h>
  50 #include <sys/mount.h>
  51 #include <sys/proc.h>
  52 #include <sys/priv.h>
  53 #include <sys/buf.h>
  54 #include <sys/mbuf.h>
  55 #include <sys/resourcevar.h>
  56 #include <sys/socket.h>
  57 #include <sys/socketvar.h>
  58 #include <sys/domain.h>
  59 #include <sys/protosw.h>
  60 #include <sys/nlookup.h>
  61 #include <sys/mutex.h>
  62 #include <vm/vm_zone.h>
  63
  64 #include <sys/mutex2.h>
  65
  66 #include <netinet/in.h>
  67 #include <netinet/tcp.h>
  68 #include "xdr_subs.h"
  69 #include "rpcv2.h"
  70 #include "nfsproto.h"
  71 #include "nfs.h"
  72 #include "nfsm_subs.h"
  73 #include "nfsrvcache.h"
  74 #include "nfsmount.h"
  75 #include "nfsnode.h"
  76 #include "nfsrtt.h"
  77
  78 #include <sys/thread2.h>
  79
  80 static MALLOC_DEFINE(M_NFSSVC, "NFS srvsock", "Nfs server structure");
  81
  82 static int nuidhash_max = NFS_MAXUIDHASH;
  83
  84 #ifndef NFS_NOSERVER
  85 static void     nfsrv_zapsock (struct nfssvc_sock *slp);
  86 #endif
  87
  88 #define TRUE    1
  89 #define FALSE   0
  90
  91 SYSCTL_DECL(_vfs_nfs);
  92
  93 #ifndef NFS_NOSERVER
  94 int nfsd_waiting = 0;
  95 static struct nfsdrt nfsdrt;
  96 static int nfs_numnfsd = 0;
  97 static void     nfsd_rt (int sotype, struct nfsrv_descript *nd,
  98                              int cacherep);
  99 static int      nfssvc_addsock (struct file *, struct sockaddr *,
 100                                     struct thread *);
 101 static int      nfssvc_nfsd (struct nfsd_srvargs *,caddr_t,struct thread *);
 102
 103 static int nfs_privport = 0;
 104 SYSCTL_INT(_vfs_nfs, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW, &nfs_privport, 0, "");
 105 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay, CTLFLAG_RW, &nfsrvw_procrastinate, 0, "");
 106 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay_v3, CTLFLAG_RW, &nfsrvw_procrastinate_v3, 0, "");
 107 int     nfs_soreserve = NFS_MAXPACKET * NFS_MAXASYNCBIO;
 108 SYSCTL_INT(_vfs_nfs, OID_AUTO, soreserve, CTLFLAG_RW, &nfs_soreserve, 0, "");
 109
 110 /*
 111  * NFS server system calls
 112  */
 113
 114 #endif /* NFS_NOSERVER */
 115 /*
 116  * nfssvc_args(int flag, caddr_t argp)
 117  *
 118  * Nfs server psuedo system call for the nfsd's
 119  * Based on the flag value it either:
 120  * - adds a socket to the selection list
 121  * - remains in the kernel as an nfsd
 122  * - remains in the kernel as an nfsiod
 123  *
 124  * MPALMOSTSAFE
 125  */
 126 int
 127 sys_nfssvc(struct nfssvc_args *uap)
 128 {
 129 #ifndef NFS_NOSERVER
 130         struct nlookupdata nd;
 131         struct file *fp;
 132         struct sockaddr *nam;
 133         struct nfsd_args nfsdarg;
 134         struct nfsd_srvargs nfsd_srvargs, *nsd = &nfsd_srvargs;
 135         struct nfsd_cargs ncd;
 136         struct nfsd *nfsd;
 137         struct nfssvc_sock *slp;
 138         struct nfsuid *nuidp;
 139         struct nfsmount *nmp;
 140         struct vnode *vp;
 141 #endif /* NFS_NOSERVER */
 142         int error;
 143         struct thread *td = curthread;
 144
 145         /*
 146          * Must be super user
 147          */
 148         error = priv_check(td, PRIV_ROOT);
 149         if (error)
 150                 return (error);
 151
 152         get_mplock();
 153         while (nfssvc_sockhead_flag & SLP_INIT) {
 154                 nfssvc_sockhead_flag |= SLP_WANTINIT;
 155                 tsleep((caddr_t)&nfssvc_sockhead, 0, "nfsd init", 0);
 156         }
 157         if (uap->flag & NFSSVC_BIOD)
 158                 error = ENXIO;          /* no longer need nfsiod's */
 159 #ifdef NFS_NOSERVER
 160         else
 161                 error = ENXIO;
 162 #else /* !NFS_NOSERVER */
 163         else if (uap->flag & NFSSVC_MNTD) {
 164                 error = copyin(uap->argp, (caddr_t)&ncd, sizeof (ncd));
 165                 if (error)
 166                         goto done;
 167                 vp = NULL;
 168                 error = nlookup_init(&nd, ncd.ncd_dirp, UIO_USERSPACE,
 169                                         NLC_FOLLOW);
 170                 if (error == 0)
 171                         error = nlookup(&nd);
 172                 if (error == 0)
 173                         error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);
 174                 nlookup_done(&nd);
 175                 if (error)
 176                         goto done;
 177
 178                 if ((vp->v_flag & VROOT) == 0)
 179                         error = EINVAL;
 180                 nmp = VFSTONFS(vp->v_mount);
 181                 vput(vp);
 182                 if (error)
 183                         goto done;
 184                 if ((nmp->nm_state & NFSSTA_MNTD) &&
 185                         (uap->flag & NFSSVC_GOTAUTH) == 0) {
 186                         error = 0;
 187                         goto done;
 188                 }
 189                 nmp->nm_state |= NFSSTA_MNTD;
 190                 error = nfs_clientd(nmp, td->td_ucred, &ncd, uap->flag,
 191                                     uap->argp, td);
 192         } else if (uap->flag & NFSSVC_ADDSOCK) {
 193                 error = copyin(uap->argp, (caddr_t)&nfsdarg, sizeof(nfsdarg));
 194                 if (error)
 195                         goto done;
 196                 error = holdsock(td->td_proc->p_fd, nfsdarg.sock, &fp);
 197                 if (error)
 198                         goto done;
 199                 /*
 200                  * Get the client address for connected sockets.
 201                  */
 202                 if (nfsdarg.name == NULL || nfsdarg.namelen == 0)
 203                         nam = NULL;
 204                 else {
 205                         error = getsockaddr(&nam, nfsdarg.name,
 206                                             nfsdarg.namelen);
 207                         if (error) {
 208                                 fdrop(fp);
 209                                 goto done;
 210                         }
 211                 }
 212                 error = nfssvc_addsock(fp, nam, td);
 213                 fdrop(fp);
 214         } else {
 215                 error = copyin(uap->argp, (caddr_t)nsd, sizeof (*nsd));
 216                 if (error)
 217                         goto done;
 218                 if ((uap->flag & NFSSVC_AUTHIN) &&
 219                     ((nfsd = nsd->nsd_nfsd)) != NULL &&
 220                     (nfsd->nfsd_slp->ns_flag & SLP_VALID)) {
 221                         slp = nfsd->nfsd_slp;
 222
 223                         /*
 224                          * First check to see if another nfsd has already
 225                          * added this credential.
 226                          */
 227                         for (nuidp = NUIDHASH(slp,nsd->nsd_cr.cr_uid)->lh_first;
 228                             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
 229                                 if (nuidp->nu_cr.cr_uid == nsd->nsd_cr.cr_uid &&
 230                                     (!nfsd->nfsd_nd->nd_nam2 ||
 231                                      netaddr_match(NU_NETFAM(nuidp),
 232                                      &nuidp->nu_haddr, nfsd->nfsd_nd->nd_nam2)))
 233                                         break;
 234                         }
 235                         if (nuidp) {
 236                             nfsrv_setcred(&nuidp->nu_cr,&nfsd->nfsd_nd->nd_cr);
 237                             nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
 238                         } else {
 239                             /*
 240                              * Nope, so we will.
 241                              */
 242                             if (slp->ns_numuids < nuidhash_max) {
 243                                 slp->ns_numuids++;
 244                                 nuidp = (struct nfsuid *)
 245                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
 246                                         M_WAITOK);
 247                             } else
 248                                 nuidp = NULL;
 249                             if ((slp->ns_flag & SLP_VALID) == 0) {
 250                                 if (nuidp)
 251                                     kfree((caddr_t)nuidp, M_NFSUID);
 252                             } else {
 253                                 if (nuidp == NULL) {
 254                                     nuidp = TAILQ_FIRST(&slp->ns_uidlruhead);
 255                                     LIST_REMOVE(nuidp, nu_hash);
 256                                     TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp,
 257                                         nu_lru);
 258                                     if (nuidp->nu_flag & NU_NAM)
 259                                         FREE(nuidp->nu_nam, M_SONAME);
 260                                 }
 261                                 nuidp->nu_flag = 0;
 262                                 nuidp->nu_cr = nsd->nsd_cr;
 263                                 if (nuidp->nu_cr.cr_ngroups > NGROUPS)
 264                                     nuidp->nu_cr.cr_ngroups = NGROUPS;
 265                                 nuidp->nu_cr.cr_ref = 1;
 266                                 nuidp->nu_timestamp = nsd->nsd_timestamp;
 267                                 nuidp->nu_expire = time_second + nsd->nsd_ttl;
 268                                 /*
 269                                  * and save the session key in nu_key.
 270                                  */
 271                                 bcopy(nsd->nsd_key, nuidp->nu_key,
 272                                     sizeof (nsd->nsd_key));
 273                                 if (nfsd->nfsd_nd->nd_nam2) {
 274                                     struct sockaddr_in *saddr;
 275
 276                                     saddr = (struct sockaddr_in *)
 277                                             nfsd->nfsd_nd->nd_nam2;
 278                                     switch (saddr->sin_family) {
 279                                     case AF_INET:
 280                                         nuidp->nu_flag |= NU_INETADDR;
 281                                         nuidp->nu_inetaddr =
 282                                              saddr->sin_addr.s_addr;
 283                                         break;
 284                                     case AF_ISO:
 285                                     default:
 286                                         nuidp->nu_flag |= NU_NAM;
 287                                         nuidp->nu_nam =
 288                                           dup_sockaddr(nfsd->nfsd_nd->nd_nam2);
 289                                         break;
 290                                     };
 291                                 }
 292                                 TAILQ_INSERT_TAIL(&slp->ns_uidlruhead, nuidp,
 293                                         nu_lru);
 294                                 LIST_INSERT_HEAD(NUIDHASH(slp, nsd->nsd_uid),
 295                                         nuidp, nu_hash);
 296                                 nfsrv_setcred(&nuidp->nu_cr,
 297                                     &nfsd->nfsd_nd->nd_cr);
 298                                 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
 299                             }
 300                         }
 301                 }
 302                 if ((uap->flag & NFSSVC_AUTHINFAIL) && (nfsd = nsd->nsd_nfsd))
 303                         nfsd->nfsd_flag |= NFSD_AUTHFAIL;
 304                 error = nfssvc_nfsd(nsd, uap->argp, td);
 305         }
 306 #endif /* NFS_NOSERVER */
 307         if (error == EINTR || error == ERESTART)
 308                 error = 0;
 309 done:
 310         rel_mplock();
 311         return (error);
 312 }
 313
 314 #ifndef NFS_NOSERVER
 315 /*
 316  * Adds a socket to the list for servicing by nfsds.
 317  */
 318 static int
 319 nfssvc_addsock(struct file *fp, struct sockaddr *mynam, struct thread *td)
 320 {
 321         int siz;
 322         struct nfssvc_sock *slp;
 323         struct socket *so;
 324         int error;
 325
 326         so = (struct socket *)fp->f_data;
 327 #if 0
 328         tslp = NULL;
 329         /*
 330          * Add it to the list, as required.
 331          */
 332         if (so->so_proto->pr_protocol == IPPROTO_UDP) {
 333                 tslp = nfs_udpsock;
 334                 if (tslp->ns_flag & SLP_VALID) {
 335                         if (mynam != NULL)
 336                                 FREE(mynam, M_SONAME);
 337                         return (EPERM);
 338                 }
 339         }
 340 #endif
 341         /*
 342          * Reserve buffer space in the socket.  Note that due to bugs in
 343          * Linux's delayed-ack code, serious performance degredation may
 344          * occur with linux hosts if the minimum is used.
 345          *
 346          * NFS sockets are not limited to the standard sb_max or by
 347          * resource limits.
 348          */
 349         if (so->so_type == SOCK_STREAM)
 350                 siz = NFS_MAXPACKET + sizeof (u_long);
 351         else
 352                 siz = NFS_MAXPACKET;
 353         if (siz < nfs_soreserve)
 354             siz = nfs_soreserve;
 355
 356         error = soreserve(so, siz, siz, NULL);
 357         if (error) {
 358                 if (mynam != NULL)
 359                         FREE(mynam, M_SONAME);
 360                 return (error);
 361         }
 362
 363         /*
 364          * Set protocol specific options { for now TCP only } and
 365          * reserve some space. For datagram sockets, this can get called
 366          * repeatedly for the same socket, but that isn't harmful.
 367          */
 368         if (so->so_type == SOCK_STREAM) {
 369                 struct sockopt sopt;
 370                 int val;
 371
 372                 bzero(&sopt, sizeof sopt);
 373                 sopt.sopt_level = SOL_SOCKET;
 374                 sopt.sopt_name = SO_KEEPALIVE;
 375                 sopt.sopt_val = &val;
 376                 sopt.sopt_valsize = sizeof val;
 377                 val = 1;
 378                 sosetopt(so, &sopt);
 379         }
 380         if (so->so_proto->pr_domain->dom_family == AF_INET &&
 381             so->so_proto->pr_protocol == IPPROTO_TCP) {
 382                 struct sockopt sopt;
 383                 int val;
 384
 385                 bzero(&sopt, sizeof sopt);
 386                 sopt.sopt_level = IPPROTO_TCP;
 387                 sopt.sopt_name = TCP_NODELAY;
 388                 sopt.sopt_val = &val;
 389                 sopt.sopt_valsize = sizeof val;
 390                 val = 1;
 391                 sosetopt(so, &sopt);
 392         }
 393         so->so_rcv.ssb_flags &= ~SSB_NOINTR;
 394         so->so_rcv.ssb_timeo = 0;
 395         so->so_snd.ssb_flags &= ~SSB_NOINTR;
 396         so->so_snd.ssb_timeo = 0;
 397
 398         slp = (struct nfssvc_sock *)kmalloc(sizeof (struct nfssvc_sock),
 399             M_NFSSVC, M_WAITOK | M_ZERO);
 400         mtx_init(&slp->ns_solock);
 401         STAILQ_INIT(&slp->ns_rec);
 402         TAILQ_INIT(&slp->ns_uidlruhead);
 403         TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain);
 404
 405         slp->ns_so = so;
 406         slp->ns_nam = mynam;
 407         fp->f_count++;
 408         slp->ns_fp = fp;
 409         crit_enter();
 410         so->so_upcallarg = (caddr_t)slp;
 411         so->so_upcall = nfsrv_rcv;
 412         so->so_rcv.ssb_flags |= SSB_UPCALL;
 413         slp->ns_flag = (SLP_VALID | SLP_NEEDQ);
 414         nfsrv_wakenfsd(slp, 1);
 415         crit_exit();
 416         return (0);
 417 }
 418
 419 /*
 420  * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
 421  * until it is killed by a signal.
 422  */
 423 static int
 424 nfssvc_nfsd(struct nfsd_srvargs *nsd, caddr_t argp, struct thread *td)
 425 {
 426         int siz;
 427         struct nfssvc_sock *slp;
 428         struct nfsd *nfsd = nsd->nsd_nfsd;
 429         struct nfsrv_descript *nd = NULL;
 430         struct mbuf *m, *mreq;
 431         int error = 0, cacherep, sotype, writes_todo;
 432         int procrastinate;
 433         u_quad_t cur_usec;
 434
 435 #ifndef nolint
 436         cacherep = RC_DOIT;
 437         writes_todo = 0;
 438 #endif
 439         if (nfsd == NULL) {
 440                 nsd->nsd_nfsd = nfsd = (struct nfsd *)
 441                         kmalloc(sizeof (struct nfsd), M_NFSD, M_WAITOK|M_ZERO);
 442                 crit_enter();
 443                 nfsd->nfsd_td = td;
 444                 TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain);
 445                 nfs_numnfsd++;
 446         } else
 447                 crit_enter();
 448
 449         /*
 450          * Loop getting rpc requests until SIGKILL.
 451          */
 452         for (;;) {
 453                 if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) {
 454                         while (nfsd->nfsd_slp == NULL &&
 455                             (nfsd_head_flag & NFSD_CHECKSLP) == 0) {
 456                                 nfsd->nfsd_flag |= NFSD_WAITING;
 457                                 nfsd_waiting++;
 458                                 error = tsleep((caddr_t)nfsd, PCATCH, "nfsd", 0);
 459                                 nfsd_waiting--;
 460                                 if (error)
 461                                         goto done;
 462                         }
 463                         if (nfsd->nfsd_slp == NULL &&
 464                             (nfsd_head_flag & NFSD_CHECKSLP) != 0) {
 465                                 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) {
 466                                     if ((slp->ns_flag & (SLP_VALID | SLP_DOREC))
 467                                         == (SLP_VALID | SLP_DOREC)) {
 468                                             slp->ns_flag &= ~SLP_DOREC;
 469                                             slp->ns_sref++;
 470                                             nfsd->nfsd_slp = slp;
 471                                             break;
 472                                     }
 473                                 }
 474                                 if (slp == 0)
 475                                         nfsd_head_flag &= ~NFSD_CHECKSLP;
 476                         }
 477                         if ((slp = nfsd->nfsd_slp) == NULL)
 478                                 continue;
 479                         if (slp->ns_flag & SLP_VALID) {
 480                                 if (slp->ns_flag & SLP_DISCONN)
 481                                         nfsrv_zapsock(slp);
 482                                 else if (slp->ns_flag & SLP_NEEDQ) {
 483                                         slp->ns_flag &= ~SLP_NEEDQ;
 484                                         (void) nfs_slplock(slp, 1);
 485                                         nfsrv_rcv(slp->ns_so, (caddr_t)slp,
 486                                                 MB_WAIT);
 487                                         nfs_slpunlock(slp);
 488                                 }
 489                                 error = nfsrv_dorec(slp, nfsd, &nd);
 490                                 cur_usec = nfs_curusec();
 491                                 if (error && slp->ns_tq.lh_first &&
 492                                     slp->ns_tq.lh_first->nd_time <= cur_usec) {
 493                                         error = 0;
 494                                         cacherep = RC_DOIT;
 495                                         writes_todo = 1;
 496                                 } else
 497                                         writes_todo = 0;
 498                                 nfsd->nfsd_flag |= NFSD_REQINPROG;
 499                         }
 500                 } else {
 501                         error = 0;
 502                         slp = nfsd->nfsd_slp;
 503                 }
 504                 if (error || (slp->ns_flag & SLP_VALID) == 0) {
 505                         if (nd) {
 506                                 kfree((caddr_t)nd, M_NFSRVDESC);
 507                                 nd = NULL;
 508                         }
 509                         nfsd->nfsd_slp = NULL;
 510                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
 511                         nfsrv_slpderef(slp);
 512                         continue;
 513                 }
 514                 crit_exit();
 515                 sotype = slp->ns_so->so_type;
 516                 if (nd) {
 517                     getmicrotime(&nd->nd_starttime);
 518                     if (nd->nd_nam2)
 519                         nd->nd_nam = nd->nd_nam2;
 520                     else
 521                         nd->nd_nam = slp->ns_nam;
 522
 523                     /*
 524                      * Check to see if authorization is needed.
 525                      */
 526                     if (nfsd->nfsd_flag & NFSD_NEEDAUTH) {
 527                         nfsd->nfsd_flag &= ~NFSD_NEEDAUTH;
 528                         nsd->nsd_haddr =
 529                                 ((struct sockaddr_in *)
 530                                  nd->nd_nam)->sin_addr.s_addr;
 531                         nsd->nsd_authlen = nfsd->nfsd_authlen;
 532                         nsd->nsd_verflen = nfsd->nfsd_verflen;
 533                         if (!copyout(nfsd->nfsd_authstr,nsd->nsd_authstr,
 534                                 nfsd->nfsd_authlen) &&
 535                             !copyout(nfsd->nfsd_verfstr, nsd->nsd_verfstr,
 536                                 nfsd->nfsd_verflen) &&
 537                             !copyout((caddr_t)nsd, argp, sizeof (*nsd)))
 538                             return (ENEEDAUTH);
 539                         cacherep = RC_DROPIT;
 540                     } else {
 541                         cacherep = nfsrv_getcache(nd, slp, &mreq);
 542                     }
 543
 544                     if (nfsd->nfsd_flag & NFSD_AUTHFAIL) {
 545                         nfsd->nfsd_flag &= ~NFSD_AUTHFAIL;
 546                         nd->nd_procnum = NFSPROC_NOOP;
 547                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
 548                         cacherep = RC_DOIT;
 549                     } else if (nfs_privport) {
 550                         /* Check if source port is privileged */
 551                         u_short port;
 552                         struct sockaddr *nam = nd->nd_nam;
 553                         struct sockaddr_in *sin;
 554
 555                         sin = (struct sockaddr_in *)nam;
 556                         port = ntohs(sin->sin_port);
 557                         if (port >= IPPORT_RESERVED &&
 558                             nd->nd_procnum != NFSPROC_NULL) {
 559                             nd->nd_procnum = NFSPROC_NOOP;
 560                             nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
 561                             cacherep = RC_DOIT;
 562                             kprintf("NFS request from unprivileged port (%s:%d)\n",
 563                                    inet_ntoa(sin->sin_addr), port);
 564                         }
 565                     }
 566
 567                 }
 568
 569                 /*
 570                  * Loop to get all the write rpc relies that have been
 571                  * gathered together.
 572                  */
 573                 do {
 574                     switch (cacherep) {
 575                     case RC_DOIT:
 576                         if (nd && (nd->nd_flag & ND_NFSV3))
 577                             procrastinate = nfsrvw_procrastinate_v3;
 578                         else
 579                             procrastinate = nfsrvw_procrastinate;
 580                         if (writes_todo || (nd->nd_procnum == NFSPROC_WRITE &&
 581                             procrastinate > 0)
 582                         ) {
 583                             error = nfsrv_writegather(&nd, slp,
 584                                 nfsd->nfsd_td, &mreq);
 585                         } else {
 586                             error = (*(nfsrv3_procs[nd->nd_procnum]))(nd,
 587                                 slp, nfsd->nfsd_td, &mreq);
 588                         }
 589                         if (mreq == NULL)
 590                                 break;
 591                         if (error != 0 && error != NFSERR_RETVOID) {
 592                                 if (nd->nd_procnum != NQNFSPROC_VACATED)
 593                                         nfsstats.srv_errs++;
 594                                 nfsrv_updatecache(nd, FALSE, mreq);
 595                                 if (nd->nd_nam2)
 596                                         FREE(nd->nd_nam2, M_SONAME);
 597                                 break;
 598                         }
 599                         nfsstats.srvrpccnt[nd->nd_procnum]++;
 600                         nfsrv_updatecache(nd, TRUE, mreq);
 601                         nd->nd_mrep = NULL;
 602                     case RC_REPLY:
 603                         m = mreq;
 604                         siz = 0;
 605                         while (m) {
 606                                 siz += m->m_len;
 607                                 m = m->m_next;
 608                         }
 609                         if (siz <= 0 || siz > NFS_MAXPACKET) {
 610                                 kprintf("mbuf siz=%d\n",siz);
 611                                 panic("Bad nfs svc reply");
 612                         }
 613                         m = mreq;
 614                         m->m_pkthdr.len = siz;
 615                         m->m_pkthdr.rcvif = NULL;
 616                         /*
 617                          * For stream protocols, prepend a Sun RPC
 618                          * Record Mark.
 619                          */
 620                         if (sotype == SOCK_STREAM) {
 621                                 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT);
 622                                 if (m == NULL)
 623                                         return (ENOBUFS);
 624                                 *mtod(m, u_int32_t *) = htonl(0x80000000 | siz);
 625                         }
 626                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
 627                                 (void) nfs_slplock(slp, 1);
 628                         if (slp->ns_flag & SLP_VALID)
 629                             error = nfs_send(slp->ns_so, nd->nd_nam2, m, NULL);
 630                         else {
 631                             error = EPIPE;
 632                             m_freem(m);
 633                         }
 634                         if (nfsrtton)
 635                                 nfsd_rt(sotype, nd, cacherep);
 636                         if (nd->nd_nam2)
 637                                 FREE(nd->nd_nam2, M_SONAME);
 638                         if (nd->nd_mrep)
 639                                 m_freem(nd->nd_mrep);
 640                         if (error == EPIPE)
 641                                 nfsrv_zapsock(slp);
 642                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
 643                                 nfs_slpunlock(slp);
 644                         if (error == EINTR || error == ERESTART) {
 645                                 kfree((caddr_t)nd, M_NFSRVDESC);
 646                                 nfsrv_slpderef(slp);
 647                                 crit_enter();
 648                                 goto done;
 649                         }
 650                         break;
 651                     case RC_DROPIT:
 652                         if (nfsrtton)
 653                                 nfsd_rt(sotype, nd, cacherep);
 654                         m_freem(nd->nd_mrep);
 655                         if (nd->nd_nam2)
 656                                 FREE(nd->nd_nam2, M_SONAME);
 657                         break;
 658                     };
 659                     if (nd) {
 660                         FREE((caddr_t)nd, M_NFSRVDESC);
 661                         nd = NULL;
 662                     }
 663
 664                     /*
 665                      * Check to see if there are outstanding writes that
 666                      * need to be serviced.
 667                      */
 668                     cur_usec = nfs_curusec();
 669                     crit_enter();
 670                     if (slp->ns_tq.lh_first &&
 671                         slp->ns_tq.lh_first->nd_time <= cur_usec) {
 672                         cacherep = RC_DOIT;
 673                         writes_todo = 1;
 674                     } else
 675                         writes_todo = 0;
 676                     crit_exit();
 677                 } while (writes_todo);
 678                 crit_enter();
 679                 if (nfsrv_dorec(slp, nfsd, &nd)) {
 680                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
 681                         nfsd->nfsd_slp = NULL;
 682                         nfsrv_slpderef(slp);
 683                 }
 684         }
 685 done:
 686         TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain);
 687         crit_exit();
 688         kfree((caddr_t)nfsd, M_NFSD);
 689         nsd->nsd_nfsd = NULL;
 690         if (--nfs_numnfsd == 0)
 691                 nfsrv_init(TRUE);       /* Reinitialize everything */
 692         return (error);
 693 }
 694
 695 /*
 696  * Shut down a socket associated with an nfssvc_sock structure.
 697  * Should be called with the send lock set, if required.
 698  * The trick here is to increment the sref at the start, so that the nfsds
 699  * will stop using it and clear ns_flag at the end so that it will not be
 700  * reassigned during cleanup.
 701  */
 702 static void
 703 nfsrv_zapsock(struct nfssvc_sock *slp)
 704 {
 705         struct nfsuid *nuidp, *nnuidp;
 706         struct nfsrv_descript *nwp, *nnwp;
 707         struct socket *so;
 708         struct file *fp;
 709         struct nfsrv_rec *rec;
 710
 711         slp->ns_flag &= ~SLP_ALLFLAGS;
 712         fp = slp->ns_fp;
 713         if (fp) {
 714                 slp->ns_fp = NULL;
 715                 so = slp->ns_so;
 716                 so->so_rcv.ssb_flags &= ~SSB_UPCALL;
 717                 so->so_upcall = NULL;
 718                 so->so_upcallarg = NULL;
 719                 soshutdown(so, SHUT_RDWR);
 720                 closef(fp, NULL);
 721                 if (slp->ns_nam)
 722                         FREE(slp->ns_nam, M_SONAME);
 723                 m_freem(slp->ns_raw);
 724                 while ((rec = STAILQ_FIRST(&slp->ns_rec)) != NULL) {
 725                         --slp->ns_numrec;
 726                         STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
 727                         if (rec->nr_address)
 728                                 FREE(rec->nr_address, M_SONAME);
 729                         m_freem(rec->nr_packet);
 730                         kfree(rec, M_NFSRVDESC);
 731                 }
 732                 TAILQ_FOREACH_MUTABLE(nuidp, &slp->ns_uidlruhead, nu_lru,
 733                                       nnuidp) {
 734                         LIST_REMOVE(nuidp, nu_hash);
 735                         TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, nu_lru);
 736                         if (nuidp->nu_flag & NU_NAM)
 737                                 FREE(nuidp->nu_nam, M_SONAME);
 738                         kfree((caddr_t)nuidp, M_NFSUID);
 739                 }
 740                 crit_enter();
 741                 for (nwp = slp->ns_tq.lh_first; nwp; nwp = nnwp) {
 742                         nnwp = nwp->nd_tq.le_next;
 743                         LIST_REMOVE(nwp, nd_tq);
 744                         kfree((caddr_t)nwp, M_NFSRVDESC);
 745                 }
 746                 LIST_INIT(&slp->ns_tq);
 747                 crit_exit();
 748         }
 749 }
 750
 751 /*
 752  * Derefence a server socket structure. If it has no more references and
 753  * is no longer valid, you can throw it away.
 754  */
 755 void
 756 nfsrv_slpderef(struct nfssvc_sock *slp)
 757 {
 758         if (--(slp->ns_sref) == 0 && (slp->ns_flag & SLP_VALID) == 0) {
 759                 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
 760                 kfree((caddr_t)slp, M_NFSSVC);
 761         }
 762 }
 763
 764 /*
 765  * Lock a socket against others.
 766  *
 767  * Returns 0 on failure, 1 on success.
 768  */
 769 int
 770 nfs_slplock(struct nfssvc_sock *slp, int wait)
 771 {
 772         mtx_t mtx = &slp->ns_solock;
 773
 774         if (wait) {
 775                 mtx_lock_ex(mtx, "nfsslplck", 0, 0);
 776                 return(1);
 777         } else if (mtx_lock_ex_try(mtx) == 0) {
 778                 return(1);
 779         } else {
 780                 return(0);
 781         }
 782 }
 783
 784 /*
 785  * Unlock the stream socket for others.
 786  */
 787 void
 788 nfs_slpunlock(struct nfssvc_sock *slp)
 789 {
 790         mtx_t mtx = &slp->ns_solock;
 791
 792         mtx_unlock(mtx);
 793 }
 794
 795 /*
 796  * Initialize the data structures for the server.
 797  * Handshake with any new nfsds starting up to avoid any chance of
 798  * corruption.
 799  */
 800 void
 801 nfsrv_init(int terminating)
 802 {
 803         struct nfssvc_sock *slp, *nslp;
 804
 805         if (nfssvc_sockhead_flag & SLP_INIT)
 806                 panic("nfsd init");
 807         nfssvc_sockhead_flag |= SLP_INIT;
 808         if (terminating) {
 809                 TAILQ_FOREACH_MUTABLE(slp, &nfssvc_sockhead, ns_chain, nslp) {
 810                         if (slp->ns_flag & SLP_VALID)
 811                                 nfsrv_zapsock(slp);
 812                         TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
 813                         kfree((caddr_t)slp, M_NFSSVC);
 814                 }
 815                 nfsrv_cleancache();     /* And clear out server cache */
 816         } else
 817                 nfs_pub.np_valid = 0;
 818
 819         TAILQ_INIT(&nfssvc_sockhead);
 820         nfssvc_sockhead_flag &= ~SLP_INIT;
 821         if (nfssvc_sockhead_flag & SLP_WANTINIT) {
 822                 nfssvc_sockhead_flag &= ~SLP_WANTINIT;
 823                 wakeup((caddr_t)&nfssvc_sockhead);
 824         }
 825
 826         TAILQ_INIT(&nfsd_head);
 827         nfsd_head_flag &= ~NFSD_CHECKSLP;
 828
 829 #if 0
 830         nfs_udpsock = (struct nfssvc_sock *)
 831             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
 832         mtx_init(&nfs_udpsock->ns_solock);
 833         STAILQ_INIT(&nfs_udpsock->ns_rec);
 834         TAILQ_INIT(&nfs_udpsock->ns_uidlruhead);
 835         TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain);
 836
 837         nfs_cltpsock = (struct nfssvc_sock *)
 838             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
 839         mtx_init(&nfs_cltpsock->ns_solock);
 840         STAILQ_INIT(&nfs_cltpsock->ns_rec);
 841         TAILQ_INIT(&nfs_cltpsock->ns_uidlruhead);
 842         TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain);
 843 #endif
 844 }
 845
 846 /*
 847  * Add entries to the server monitor log.
 848  */
 849 static void
 850 nfsd_rt(int sotype, struct nfsrv_descript *nd, int cacherep)
 851 {
 852         struct drt *rt;
 853
 854         rt = &nfsdrt.drt[nfsdrt.pos];
 855         if (cacherep == RC_DOIT)
 856                 rt->flag = 0;
 857         else if (cacherep == RC_REPLY)
 858                 rt->flag = DRT_CACHEREPLY;
 859         else
 860                 rt->flag = DRT_CACHEDROP;
 861         if (sotype == SOCK_STREAM)
 862                 rt->flag |= DRT_TCP;
 863         if (nd->nd_flag & ND_NFSV3)
 864                 rt->flag |= DRT_NFSV3;
 865         rt->proc = nd->nd_procnum;
 866         if (nd->nd_nam->sa_family == AF_INET)
 867             rt->ipadr = ((struct sockaddr_in *)nd->nd_nam)->sin_addr.s_addr;
 868         else
 869             rt->ipadr = INADDR_ANY;
 870         rt->resptime = nfs_curusec() - (nd->nd_starttime.tv_sec * 1000000 + nd->nd_starttime.tv_usec);
 871         getmicrotime(&rt->tstamp);
 872         nfsdrt.pos = (nfsdrt.pos + 1) % NFSRTTLOGSIZ;
 873 }
 874 #endif /* NFS_NOSERVER */
 875
 876 static int nfs_defect = 0;
 877 SYSCTL_INT(_vfs_nfs, OID_AUTO, defect, CTLFLAG_RW, &nfs_defect, 0, "");
 878
 879 /*
 880  * Get an authorization string for the uid by having the mount_nfs sitting
 881  * on this mount point porpous out of the kernel and do it.
 882  */
 883 int
 884 nfs_getauth(struct nfsmount *nmp, struct nfsreq *rep,
 885             struct ucred *cred, char **auth_str, int *auth_len, char *verf_str,
 886             int *verf_len, NFSKERBKEY_T key /* return session key */)
 887 {
 888         int error = 0;
 889
 890         while ((nmp->nm_state & NFSSTA_WAITAUTH) == 0) {
 891                 nmp->nm_state |= NFSSTA_WANTAUTH;
 892                 (void) tsleep((caddr_t)&nmp->nm_authtype, 0,
 893                         "nfsauth1", 2 * hz);
 894                 error = nfs_sigintr(nmp, rep, rep->r_td);
 895                 if (error) {
 896                         nmp->nm_state &= ~NFSSTA_WANTAUTH;
 897                         return (error);
 898                 }
 899         }
 900         nmp->nm_state &= ~(NFSSTA_WAITAUTH | NFSSTA_WANTAUTH);
 901         nmp->nm_authstr = *auth_str = (char *)kmalloc(RPCAUTH_MAXSIZ, M_TEMP, M_WAITOK);
 902         nmp->nm_authlen = RPCAUTH_MAXSIZ;
 903         nmp->nm_verfstr = verf_str;
 904         nmp->nm_verflen = *verf_len;
 905         nmp->nm_authuid = cred->cr_uid;
 906         wakeup((caddr_t)&nmp->nm_authstr);
 907
 908         /*
 909          * And wait for mount_nfs to do its stuff.
 910          */
 911         while ((nmp->nm_state & NFSSTA_HASAUTH) == 0 && error == 0) {
 912                 (void) tsleep((caddr_t)&nmp->nm_authlen, 0,
 913                         "nfsauth2", 2 * hz);
 914                 error = nfs_sigintr(nmp, rep, rep->r_td);
 915         }
 916         if (nmp->nm_state & NFSSTA_AUTHERR) {
 917                 nmp->nm_state &= ~NFSSTA_AUTHERR;
 918                 error = EAUTH;
 919         }
 920         if (error)
 921                 kfree((caddr_t)*auth_str, M_TEMP);
 922         else {
 923                 *auth_len = nmp->nm_authlen;
 924                 *verf_len = nmp->nm_verflen;
 925                 bcopy((caddr_t)nmp->nm_key, (caddr_t)key, sizeof (key));
 926         }
 927         nmp->nm_state &= ~NFSSTA_HASAUTH;
 928         nmp->nm_state |= NFSSTA_WAITAUTH;
 929         if (nmp->nm_state & NFSSTA_WANTAUTH) {
 930                 nmp->nm_state &= ~NFSSTA_WANTAUTH;
 931                 wakeup((caddr_t)&nmp->nm_authtype);
 932         }
 933         return (error);
 934 }
 935
 936 /*
 937  * Get a nickname authenticator and verifier.
 938  */
 939 int
 940 nfs_getnickauth(struct nfsmount *nmp, struct ucred *cred, char **auth_str,
 941                 int *auth_len, char *verf_str, int verf_len)
 942 {
 943         struct nfsuid *nuidp;
 944         u_int32_t *nickp, *verfp;
 945         struct timeval ktvin, ktvout;
 946
 947 #ifdef DIAGNOSTIC
 948         if (verf_len < (4 * NFSX_UNSIGNED))
 949                 panic("nfs_getnickauth verf too small");
 950 #endif
 951         for (nuidp = NMUIDHASH(nmp, cred->cr_uid)->lh_first;
 952             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
 953                 if (nuidp->nu_cr.cr_uid == cred->cr_uid)
 954                         break;
 955         }
 956         if (!nuidp || nuidp->nu_expire < time_second)
 957                 return (EACCES);
 958
 959         /*
 960          * Move to the end of the lru list (end of lru == most recently used).
 961          */
 962         TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru);
 963         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, nu_lru);
 964
 965         nickp = (u_int32_t *)kmalloc(2 * NFSX_UNSIGNED, M_TEMP, M_WAITOK);
 966         *nickp++ = txdr_unsigned(RPCAKN_NICKNAME);
 967         *nickp = txdr_unsigned(nuidp->nu_nickname);
 968         *auth_str = (char *)nickp;
 969         *auth_len = 2 * NFSX_UNSIGNED;
 970
 971         /*
 972          * Now we must encrypt the verifier and package it up.
 973          */
 974         verfp = (u_int32_t *)verf_str;
 975         *verfp++ = txdr_unsigned(RPCAKN_NICKNAME);
 976         if (time_second > nuidp->nu_timestamp.tv_sec ||
 977             (time_second == nuidp->nu_timestamp.tv_sec &&
 978              time_second > nuidp->nu_timestamp.tv_usec))
 979                 getmicrotime(&nuidp->nu_timestamp);
 980         else
 981                 nuidp->nu_timestamp.tv_usec++;
 982         ktvin.tv_sec = txdr_unsigned(nuidp->nu_timestamp.tv_sec);
 983         ktvin.tv_usec = txdr_unsigned(nuidp->nu_timestamp.tv_usec);
 984
 985         /*
 986          * Now encrypt the timestamp verifier in ecb mode using the session
 987          * key.
 988          */
 989 #ifdef NFSKERB
 990         XXX
 991 #else
 992         ktvout.tv_sec = 0;
 993         ktvout.tv_usec = 0;
 994 #endif
 995
 996         *verfp++ = ktvout.tv_sec;
 997         *verfp++ = ktvout.tv_usec;
 998         *verfp = 0;
 999         return (0);
1000 }
1001
1002 /*
1003  * Save the current nickname in a hash list entry on the mount point.
1004  */
1005 int
1006 nfs_savenickauth(struct nfsmount *nmp, struct ucred *cred, int len,
1007                  NFSKERBKEY_T key, struct mbuf **mdp, char **dposp,
1008                  struct mbuf *mrep)
1009 {
1010         struct nfsuid *nuidp;
1011         u_int32_t *tl;
1012         struct timeval ktvin, ktvout;
1013         u_int32_t nick;
1014         int deltasec, error = 0;
1015         struct nfsm_info info;
1016
1017         info.md = *mdp;
1018         info.dpos = *dposp;
1019         info.mrep = mrep;
1020
1021         if (len == (3 * NFSX_UNSIGNED)) {
1022                 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED));
1023                 ktvin.tv_sec = *tl++;
1024                 ktvin.tv_usec = *tl++;
1025                 nick = fxdr_unsigned(u_int32_t, *tl);
1026
1027                 /*
1028                  * Decrypt the timestamp in ecb mode.
1029                  */
1030 #ifdef NFSKERB
1031                 XXX
1032 #else
1033                 ktvout.tv_sec = 0;
1034                 ktvout.tv_usec = 0;
1035 #endif
1036                 ktvout.tv_sec = fxdr_unsigned(long, ktvout.tv_sec);
1037                 ktvout.tv_usec = fxdr_unsigned(long, ktvout.tv_usec);
1038                 deltasec = time_second - ktvout.tv_sec;
1039                 if (deltasec < 0)
1040                         deltasec = -deltasec;
1041                 /*
1042                  * If ok, add it to the hash list for the mount point.
1043                  */
1044                 if (deltasec <= NFS_KERBCLOCKSKEW) {
1045                         if (nmp->nm_numuids < nuidhash_max) {
1046                                 nmp->nm_numuids++;
1047                                 nuidp = (struct nfsuid *)
1048                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
1049                                         M_WAITOK);
1050                         } else {
1051                                 nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead);
1052                                 LIST_REMOVE(nuidp, nu_hash);
1053                                 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp,
1054                                         nu_lru);
1055                         }
1056                         nuidp->nu_flag = 0;
1057                         nuidp->nu_cr.cr_uid = cred->cr_uid;
1058                         nuidp->nu_expire = time_second + NFS_KERBTTL;
1059                         nuidp->nu_timestamp = ktvout;
1060                         nuidp->nu_nickname = nick;
1061                         bcopy(key, nuidp->nu_key, sizeof (key));
1062                         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp,
1063                                 nu_lru);
1064                         LIST_INSERT_HEAD(NMUIDHASH(nmp, cred->cr_uid),
1065                                 nuidp, nu_hash);
1066                 }
1067         } else {
1068                 ERROROUT(nfsm_adv(&info, nfsm_rndup(len)));
1069         }
1070 nfsmout:
1071         *mdp = info.md;
1072         *dposp = info.dpos;
1073         return (error);
1074 }