The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/nfsserver/nfs_srvkrpc.c

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    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  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)nfs_syscalls.c      8.5 (Berkeley) 3/30/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/10.1/sys/nfsserver/nfs_srvkrpc.c 255219 2013-09-05 00:09:56Z pjd $");
   37 
   38 #include "opt_inet6.h"
   39 #include "opt_kgssapi.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/capability.h>
   43 #include <sys/systm.h>
   44 #include <sys/sysproto.h>
   45 #include <sys/kernel.h>
   46 #include <sys/sysctl.h>
   47 #include <sys/file.h>
   48 #include <sys/filedesc.h>
   49 #include <sys/jail.h>
   50 #include <sys/vnode.h>
   51 #include <sys/malloc.h>
   52 #include <sys/mount.h>
   53 #include <sys/priv.h>
   54 #include <sys/proc.h>
   55 #include <sys/bio.h>
   56 #include <sys/buf.h>
   57 #include <sys/mbuf.h>
   58 #include <sys/socket.h>
   59 #include <sys/socketvar.h>
   60 #include <sys/domain.h>
   61 #include <sys/protosw.h>
   62 #include <sys/namei.h>
   63 #include <sys/fcntl.h>
   64 #include <sys/lockf.h>
   65 #include <sys/eventhandler.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 
   74 #include <rpc/rpc.h>
   75 #include <rpc/rpcsec_gss.h>
   76 #include <rpc/replay.h>
   77 
   78 #include <nfs/xdr_subs.h>
   79 #include <nfs/nfsproto.h>
   80 #include <nfs/nfs_fha.h>
   81 #include <nfsserver/nfs.h>
   82 #include <nfsserver/nfsm_subs.h>
   83 #include <nfsserver/nfsrvcache.h>
   84 #include <nfsserver/nfs_fha_old.h>
   85 
   86 #include <security/mac/mac_framework.h>
   87 
   88 static MALLOC_DEFINE(M_NFSSVC, "nfss_srvsock", "Nfs server structure");
   89 
   90 MALLOC_DEFINE(M_NFSRVDESC, "nfss_srvdesc", "NFS server socket descriptor");
   91 MALLOC_DEFINE(M_NFSD, "nfss_daemon", "Nfs server daemon structure");
   92 
   93 #define TRUE    1
   94 #define FALSE   0
   95 
   96 SYSCTL_DECL(_vfs_nfsrv);
   97 
   98 SVCPOOL         *nfsrv_pool;
   99 int             nfsd_waiting = 0;
  100 int             nfsrv_numnfsd = 0;
  101 struct callout  nfsrv_callout;
  102 static eventhandler_tag nfsrv_nmbclusters_tag;
  103 
  104 static int      nfs_privport = 0;
  105 SYSCTL_INT(_vfs_nfsrv, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW,
  106     &nfs_privport, 0,
  107     "Only allow clients using a privileged port");
  108 SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay, CTLFLAG_RW,
  109     &nfsrvw_procrastinate, 0,
  110     "Delay value for write gathering");
  111 SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay_v3, CTLFLAG_RW,
  112     &nfsrvw_procrastinate_v3, 0,
  113     "Delay in seconds for NFSv3 write gathering");
  114 
  115 static int      nfssvc_addsock(struct file *, struct thread *);
  116 static int      nfssvc_nfsd(struct thread *, struct nfsd_nfsd_args *);
  117 
  118 extern u_long sb_max_adj;
  119 
  120 int32_t (*nfsrv3_procs[NFS_NPROCS])(struct nfsrv_descript *nd,
  121     struct nfssvc_sock *slp, struct mbuf **mreqp) = {
  122         nfsrv_null,
  123         nfsrv_getattr,
  124         nfsrv_setattr,
  125         nfsrv_lookup,
  126         nfsrv3_access,
  127         nfsrv_readlink,
  128         nfsrv_read,
  129         nfsrv_write,
  130         nfsrv_create,
  131         nfsrv_mkdir,
  132         nfsrv_symlink,
  133         nfsrv_mknod,
  134         nfsrv_remove,
  135         nfsrv_rmdir,
  136         nfsrv_rename,
  137         nfsrv_link,
  138         nfsrv_readdir,
  139         nfsrv_readdirplus,
  140         nfsrv_statfs,
  141         nfsrv_fsinfo,
  142         nfsrv_pathconf,
  143         nfsrv_commit,
  144         nfsrv_noop
  145 };
  146 
  147 /*
  148  * NFS server system calls
  149  */
  150 /*
  151  * This is now called from nfssvc() in nfs/nfs_nfssvc.c.
  152  */
  153 
  154 /*
  155  * Nfs server psuedo system call for the nfsd's
  156  * Based on the flag value it either:
  157  * - adds a socket to the selection list
  158  * - remains in the kernel as an nfsd
  159  * - remains in the kernel as an nfsiod
  160  * For INET6 we suppose that nfsd provides only IN6P_IPV6_V6ONLY sockets
  161  * and that mountd provides
  162  *  - sockaddr with no IPv4-mapped addresses
  163  *  - mask for both INET and INET6 families if there is IPv4-mapped overlap
  164  */
  165 int
  166 nfssvc_nfsserver(struct thread *td, struct nfssvc_args *uap)
  167 {
  168         struct file *fp;
  169         struct nfsd_addsock_args addsockarg;
  170         struct nfsd_nfsd_args nfsdarg;
  171         cap_rights_t rights;
  172         int error;
  173 
  174         if (uap->flag & NFSSVC_ADDSOCK) {
  175                 error = copyin(uap->argp, (caddr_t)&addsockarg,
  176                     sizeof(addsockarg));
  177                 if (error)
  178                         return (error);
  179                 error = fget(td, addsockarg.sock,
  180                     cap_rights_init(&rights, CAP_SOCK_SERVER), &fp);
  181                 if (error)
  182                         return (error);
  183                 if (fp->f_type != DTYPE_SOCKET) {
  184                         fdrop(fp, td);
  185                         return (error); /* XXXRW: Should be EINVAL? */
  186                 }
  187                 error = nfssvc_addsock(fp, td);
  188                 fdrop(fp, td);
  189         } else if (uap->flag & NFSSVC_OLDNFSD)
  190                 error = nfssvc_nfsd(td, NULL);
  191         else if (uap->flag & NFSSVC_NFSD) {
  192                 if (!uap->argp)
  193                         return (EINVAL);
  194                 error = copyin(uap->argp, (caddr_t)&nfsdarg,
  195                     sizeof(nfsdarg));
  196                 if (error)
  197                         return (error);
  198                 error = nfssvc_nfsd(td, &nfsdarg);
  199         } else
  200                 error = ENXIO;
  201         return (error);
  202 }
  203 
  204 /*
  205  * Generate the rpc reply header
  206  * siz arg. is used to decide if adding a cluster is worthwhile
  207  */
  208 struct mbuf *
  209 nfs_rephead(int siz, struct nfsrv_descript *nd, int err,
  210     struct mbuf **mbp, caddr_t *bposp)
  211 {
  212         u_int32_t *tl;
  213         struct mbuf *mreq;
  214         caddr_t bpos;
  215         struct mbuf *mb;
  216 
  217         if (err == EBADRPC)
  218                 return (NULL);
  219 
  220         nd->nd_repstat = err;
  221         if (err && (nd->nd_flag & ND_NFSV3) == 0)       /* XXX recheck */
  222                 siz = 0;
  223 
  224         MGET(mreq, M_WAITOK, MT_DATA);
  225 
  226         /*
  227          * If this is a big reply, use a cluster
  228          */
  229         mreq->m_len = 0;
  230         if (siz >= MINCLSIZE) {
  231                 MCLGET(mreq, M_WAITOK);
  232         }
  233         mb = mreq;
  234         bpos = mtod(mb, caddr_t);
  235 
  236         if (err != NFSERR_RETVOID) {
  237                 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
  238                 if (err)
  239                         *tl = txdr_unsigned(nfsrv_errmap(nd, err));
  240                 else
  241                         *tl = 0;
  242         }
  243 
  244         *mbp = mb;
  245         *bposp = bpos;
  246         if (err != 0 && err != NFSERR_RETVOID)
  247                 nfsrvstats.srvrpc_errs++;
  248 
  249         return (mreq);
  250 }
  251 
  252 static void
  253 nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
  254 {
  255         rpcproc_t procnum;
  256         int32_t (*proc)(struct nfsrv_descript *nd, struct nfssvc_sock *slp,
  257             struct mbuf **mreqp);
  258         int flag;
  259         struct nfsrv_descript nd;
  260         struct mbuf *mreq, *mrep;
  261         int error;
  262 
  263         if (rqst->rq_vers == NFS_VER2) {
  264                 if (rqst->rq_proc > NFSV2PROC_STATFS) {
  265                         svcerr_noproc(rqst);
  266                         svc_freereq(rqst);
  267                         return;
  268                 }
  269                 procnum = nfsrv_nfsv3_procid[rqst->rq_proc];
  270                 flag = 0;
  271         } else {
  272                 if (rqst->rq_proc >= NFS_NPROCS) {
  273                         svcerr_noproc(rqst);
  274                         svc_freereq(rqst);
  275                         return;
  276                 }
  277                 procnum = rqst->rq_proc;
  278                 flag = ND_NFSV3;
  279         }
  280         proc = nfsrv3_procs[procnum];
  281 
  282         mreq = mrep = NULL;
  283         mreq = rqst->rq_args;
  284         rqst->rq_args = NULL;
  285         (void)nfs_realign(&mreq, M_WAITOK);
  286 
  287         /*
  288          * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
  289          * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
  290          * mounts.
  291          */
  292         memset(&nd, 0, sizeof(nd));
  293         nd.nd_md = nd.nd_mrep = mreq;
  294         nd.nd_dpos = mtod(mreq, caddr_t);
  295         nd.nd_nam = svc_getrpccaller(rqst);
  296         nd.nd_nam2 = rqst->rq_addr;
  297         nd.nd_procnum = procnum;
  298         nd.nd_cr = NULL;
  299         nd.nd_flag = flag;
  300 
  301         if (nfs_privport) {
  302                 /* Check if source port is privileged */
  303                 u_short port;
  304                 struct sockaddr *nam = nd.nd_nam;
  305                 struct sockaddr_in *sin;
  306 
  307                 sin = (struct sockaddr_in *)nam;
  308                 /*
  309                  * INET/INET6 - same code:
  310                  *    sin_port and sin6_port are at same offset
  311                  */
  312                 port = ntohs(sin->sin_port);
  313                 if (port >= IPPORT_RESERVED &&
  314                     nd.nd_procnum != NFSPROC_NULL) {
  315 #ifdef INET6
  316                         char b6[INET6_ADDRSTRLEN];
  317 #if defined(KLD_MODULE)
  318                         /* Do not use ip6_sprintf: the nfs module should work without INET6. */
  319 #define ip6_sprintf(buf, a)                                             \
  320                         (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x",      \
  321                             (a)->s6_addr16[0], (a)->s6_addr16[1],       \
  322                             (a)->s6_addr16[2], (a)->s6_addr16[3],       \
  323                             (a)->s6_addr16[4], (a)->s6_addr16[5],       \
  324                             (a)->s6_addr16[6], (a)->s6_addr16[7]),      \
  325                             (buf))
  326 #endif
  327 #endif
  328                         printf("NFS request from unprivileged port (%s:%d)\n",
  329 #ifdef INET6
  330                             sin->sin_family == AF_INET6 ?
  331                             ip6_sprintf(b6, &satosin6(sin)->sin6_addr) :
  332 #if defined(KLD_MODULE)
  333 #undef ip6_sprintf
  334 #endif
  335 #endif
  336                             inet_ntoa(sin->sin_addr), port);
  337                         m_freem(mreq);
  338                         svcerr_weakauth(rqst);
  339                         svc_freereq(rqst);
  340                         return;
  341                 }
  342         }
  343 
  344         if (proc != nfsrv_null) {
  345                 if (!svc_getcred(rqst, &nd.nd_cr, &nd.nd_credflavor)) {
  346                         m_freem(mreq);
  347                         svcerr_weakauth(rqst);
  348                         svc_freereq(rqst);
  349                         return;
  350                 }
  351 #ifdef MAC
  352                 mac_cred_associate_nfsd(nd.nd_cr);
  353 #endif
  354         }
  355         nfsrvstats.srvrpccnt[nd.nd_procnum]++;
  356 
  357         error = proc(&nd, NULL, &mrep);
  358 
  359         if (nd.nd_cr)
  360                 crfree(nd.nd_cr);
  361 
  362         if (mrep == NULL) {
  363                 svcerr_decode(rqst);
  364                 svc_freereq(rqst);
  365                 return;
  366         }
  367         if (error && error != NFSERR_RETVOID) {
  368                 svcerr_systemerr(rqst);
  369                 svc_freereq(rqst);
  370                 return;
  371         }
  372         if (nd.nd_repstat & NFSERR_AUTHERR) {
  373                 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
  374                 m_freem(mrep);
  375         } else {
  376                 if (!svc_sendreply_mbuf(rqst, mrep))
  377                         svcerr_systemerr(rqst);
  378         }
  379         svc_freereq(rqst);
  380 }
  381 
  382 /*
  383  * Adds a socket to the list for servicing by nfsds.
  384  */
  385 static int
  386 nfssvc_addsock(struct file *fp, struct thread *td)
  387 {
  388         int siz;
  389         struct socket *so;
  390         int error;
  391         SVCXPRT *xprt;
  392 
  393         so = fp->f_data;
  394 
  395         siz = sb_max_adj;
  396         error = soreserve(so, siz, siz);
  397         if (error)
  398                 return (error);
  399 
  400         /*
  401          * Steal the socket from userland so that it doesn't close
  402          * unexpectedly.
  403          */
  404         if (so->so_type == SOCK_DGRAM)
  405                 xprt = svc_dg_create(nfsrv_pool, so, 0, 0);
  406         else
  407                 xprt = svc_vc_create(nfsrv_pool, so, 0, 0);
  408         if (xprt) {
  409                 fp->f_ops = &badfileops;
  410                 fp->f_data = NULL;
  411                 svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program, NULL);
  412                 svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program, NULL);
  413                 SVC_RELEASE(xprt);
  414         }
  415 
  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 thread *td, struct nfsd_nfsd_args *args)
  425 {
  426         char principal[128];
  427         int error;
  428 
  429         if (args) {
  430                 error = copyinstr(args->principal, principal,
  431                     sizeof(principal), NULL);
  432                 if (error)
  433                         return (error);
  434         } else {
  435                 memcpy(principal, "nfs@", 4);
  436                 getcredhostname(td->td_ucred, principal + 4,
  437                     sizeof(principal) - 4);
  438         }
  439 
  440         /*
  441          * Only the first nfsd actually does any work.  The RPC code
  442          * adds threads to it as needed.  Any extra processes offered
  443          * by nfsd just exit.  If nfsd is new enough, it will call us
  444          * once with a structure that specifies how many threads to
  445          * use.
  446          */
  447         NFSD_LOCK();
  448         if (nfsrv_numnfsd == 0) {
  449                 nfsrv_numnfsd++;
  450 
  451                 NFSD_UNLOCK();
  452 
  453                 rpc_gss_set_svc_name_call(principal, "kerberosv5",
  454                     GSS_C_INDEFINITE, NFS_PROG, NFS_VER2);
  455                 rpc_gss_set_svc_name_call(principal, "kerberosv5",
  456                     GSS_C_INDEFINITE, NFS_PROG, NFS_VER3);
  457 
  458                 if (args) {
  459                         nfsrv_pool->sp_minthreads = args->minthreads;
  460                         nfsrv_pool->sp_maxthreads = args->maxthreads;
  461                 } else {
  462                         nfsrv_pool->sp_minthreads = 4;
  463                         nfsrv_pool->sp_maxthreads = 4;
  464                 }
  465 
  466                 svc_run(nfsrv_pool);
  467 
  468                 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2);
  469                 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3);
  470 
  471                 NFSD_LOCK();
  472                 nfsrv_numnfsd--;
  473                 nfsrv_init(TRUE);
  474         }
  475         NFSD_UNLOCK();
  476 
  477         return (0);
  478 }
  479 
  480 /*
  481  * Size the NFS server's duplicate request cache at 1/2 the
  482  * nmbclusters, floating within a (64, 2048) range.  This is to
  483  * prevent all mbuf clusters being tied up in the NFS dupreq
  484  * cache for small values of nmbclusters.
  485  */
  486 static size_t
  487 nfsrv_replay_size(void)
  488 {
  489         size_t replaysiz;
  490 
  491         replaysiz = nmbclusters / 2;
  492         if (replaysiz > NFSRVCACHE_MAX_SIZE)
  493                 replaysiz = NFSRVCACHE_MAX_SIZE;
  494         if (replaysiz < NFSRVCACHE_MIN_SIZE)
  495                 replaysiz = NFSRVCACHE_MIN_SIZE;
  496         replaysiz *= MCLBYTES;
  497 
  498         return (replaysiz);
  499 }
  500 
  501 /*
  502  * Called when nmbclusters changes - we resize the replay cache
  503  * accordingly.
  504  */
  505 static void
  506 nfsrv_nmbclusters_change(void *tag)
  507 {
  508 
  509         if (nfsrv_pool)
  510                 replay_setsize(nfsrv_pool->sp_rcache, nfsrv_replay_size());
  511 }
  512 
  513 /*
  514  * Initialize the data structures for the server.
  515  * Handshake with any new nfsds starting up to avoid any chance of
  516  * corruption.
  517  */
  518 void
  519 nfsrv_init(int terminating)
  520 {
  521 
  522         NFSD_LOCK_ASSERT();
  523 
  524         if (terminating) {
  525                 NFSD_UNLOCK();
  526                 EVENTHANDLER_DEREGISTER(nmbclusters_change,
  527                     nfsrv_nmbclusters_tag);
  528                 svcpool_destroy(nfsrv_pool);
  529                 nfsrv_pool = NULL;
  530                 NFSD_LOCK();
  531         } else
  532                 nfs_pub.np_valid = 0;
  533 
  534         NFSD_UNLOCK();
  535 
  536         nfsrv_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_nfsrv));
  537         nfsrv_pool->sp_rcache = replay_newcache(nfsrv_replay_size());
  538         nfsrv_pool->sp_assign = fhaold_assign;
  539         nfsrv_pool->sp_done = fha_nd_complete;
  540         nfsrv_nmbclusters_tag = EVENTHANDLER_REGISTER(nmbclusters_change,
  541             nfsrv_nmbclusters_change, NULL, EVENTHANDLER_PRI_FIRST);
  542 
  543         NFSD_LOCK();
  544 }

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